40-F/A

U.S. SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 40-F/A
(Amendment No. 1)

(Check One)

☐ Registration statement pursuant to Section 12 of the Securities Exchange Act of 1934

or

ý Annual report pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934

For the fiscal year ended December 31, 2017

Commission file number: 001-37694

NORBORD INC.

(Exact name of registrant as specified in its charter)

Canada	2,400	Not Applicable
(Province or other jurisdiction of incorporation or organization)	(Primary Standard Industrial Classification Code Number (if applicable))	(I.R.S. Employer Identification Number)

1 Toronto Street, Suite 600

Toronto, Ontario, Canada, M5C 2W4

(416) 365-0705

(Address and Telephone Number of Registrant’s Principal Executive Offices)

Torys LLP

1114 Avenue of the Americas

23rd Floor

New York, New York 10036

Attention: Andrew J. Beck

(212) 880-6010

(Name, Address (Including Zip Code) and Telephone Number (Including Area Code)

of Agent For Service in the United States)

Securities registered or to be registered pursuant to Section 12(b) of the Act.

Title of Each Class	Name Of Exchange On Which Registered
Common Shares, Without Par Value	New York Stock Exchange

Securities registered or to be registered pursuant to Section 12(g) of the Act: None

Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act: None

For annual reports, indicate by check mark the information filed with this Form:

ý  Annual Information Form	ý  Audited Annual Financial Statements
_________________________________________________

Indicate the number of outstanding shares of each of the issuer’s classes of capital or common stock as of the close of the period covered by the annual report: 86,402,076 common shares.

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Exchange Act during the preceding 12 months (or for such shorter period that the registrant was required to file such reports); and (2) has been subject to such filing requirements for the past 90 days.

Yes  ý            No  ☐

Indicate by check mark whether the Registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the Registrant was required to submit and post such files).

Yes  ý            No  ☐

Emerging growth company   ☐

If an emerging growth company that prepares its financial statements in accordance with U.S. GAAP, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

-2-

EXPLANATORY NOTE

The purpose of this Amendment No. 1 to our Annual Report on Form 40-F (“Form 40-F”) for the fiscal year ended December 31, 2017, as filed with the Securities and Exchange Commission on February 2, 2018, is to furnish Exhibit 101 to the Form 40-F, which provides certain items from our Form 40-F formatted in eXtensible Business Reporting Language (“XBRL”).

No other changes have been made to the Form 40-F other than the furnishing of the exhibit described above. This Amendment No. 1 does not reflect subsequent events occurring after the original date of the Form 40-F or modify or update in any way disclosures made in the Form 40-F.

-1-

SIGNATURES

Pursuant to the requirements of the United States Securities Exchange Act of 1934, as amended, the Registrant certifies that it meets all of the requirements for filing on Form 40-F and has duly caused this Annual Report to be signed on its behalf by the undersigned, thereto duly authorized.

Date: February 15, 2018	NORBORD INC.
	By:	/s/ Robin E. Lampard
		Name: Robin E. Lampard
		Title: Chief Financial Officer

EXHIBIT INDEX

Exhibit	Description
99.1*	Annual Information Form, dated February 1, 2018, for the Year Ended December 31, 2017
99.2*	Management’s Discussion and Analysis for the Annual Audited Consolidated Financial Statements for the Year Ended December 31, 2017
99.3*	Annual Audited Consolidated Financial Statements for the Year Ended December 31, 2017, and the Attestation Report of the Independent Registered Public Accounting Firm.
99.4*	Certification of Chief Executive Officer pursuant to Rule 13a-14(a) or 15d-14(a) of the Securities Exchange Act of 1934
99.5*	Certification of Chief Financial Officer pursuant to Rule 13a-14(a) or 15d-14(a) of the Securities Exchange Act of 1934
99.6*	Section 1350 Certification of Chief Executive Officer
99.7*	Section 1350 Certification of Chief Financial Officer
99.8*	Consent of KPMG LLP
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document
*	Previously filed

XML

Document and Entity Information	12 Months Ended
	Dec. 31, 2017 shares
Document And Entity Information [Abstract]
Entity Registrant Name	Norbord Inc.
Entity Central Index Key	0000877365
Current Fiscal Year End Date	--12-31
Document Type	40-F/A
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Amendment Flag	true
Amendment Description	The purpose of this Amendment No. 1 to our Annual Report on Form 40-F (“Form 40-F”) for the fiscal year ended December 31, 2017, as filed with the Securities and Exchange Commission on February 2, 2018, is to furnish Exhibit 101 to the Form 40-F, which provides certain items from our Form 40-F formatted in eXtensible Business Reporting Language (“XBRL”). No other changes have been made to the Form 40-F other than the furnishing of the exhibit described above. This Amendment No. 1 does not reflect subsequent events occurring after the original date of the Form 40-F or modify or update in any way disclosures made in the Form 40-F.
Entity Common Stock, Shares Outstanding	86,402,076
Entity Current Reporting Status	Yes

XML

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 241	$ 161
Accounts receivable	174	141
Taxes receivable	1	0
Inventory	224	185
Prepaids	11	10
Current assets	651	497
Non-current assets
Property, plant and equipment	1,421	1,262
Intangible assets	24	22
Deferred income tax assets	4	4
Other assets	3	14
Non-current assets	1,452	1,302
Assets	2,103	1,799
Current liabilities
Accounts payable and accrued liabilities	282	218
Taxes payable	74	1
Current portion of long-term debt	0	200
Current liabilities	356	419
Non-current liabilities
Long-term debt	548	546
Other liabilities	29	27
Deferred income tax liabilities	151	157
Non-current liabilities	728	730
Shareholders’ equity	1,019	650
Liabilities and shareholders' equity	$ 2,103	$ 1,799

XML

Consolidated Statements of Earnings - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Profit or loss [abstract]
Sales	$ 2,177	$ 1,766
Cost of sales	(1,499)	(1,378)
General and administrative expenses	(10)	(14)
Depreciation and amortization	(107)	(94)
Loss on disposal of assets	(12)	0
Operating income	549	280
Non-operating (expense) income:
Finance costs	(32)	(52)
Gain on asset exchange	0	16
Earnings before income tax	517	244
Income tax expense	(81)	(61)
Profit (loss)	$ 436	$ 183
Earnings per common share
Basic (in dollars per share)	$ 5.06	$ 2.14
Diluted (in dollars per share)	$ 5.03	$ 2.13

XML

Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement of comprehensive income [abstract]
Earnings	$ 436	$ 183
Items that will not be reclassified to earnings:
Actuarial (loss) gain on post-employment obligation	(3)	5
Items that may be reclassified subsequently to earnings:
Foreign currency translation gain (loss) on foreign operations	29	(37)
Other comprehensive income (loss), net of tax	26	(32)
Comprehensive income	$ 462	$ 151

XML

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Millions	Total	Share capital	Merger reserve	Contributed surplus	Retained deficit		Accumulated other comprehensive loss
Balance, beginning of year at Dec. 31, 2015		$ 1,334		$ 10	$ (559)		$ (170)
Issue of common shares upon exercise of options and Dividend Reinvestment Plan		7
Stock-based compensation				1
Stock options exercised	$ 3			(2)
Earnings	183				183
Common share dividends					(26)
Other comprehensive income (loss)	(32)						(32)
Balance, end of year at Dec. 31, 2016	650	1,341	$ (96)	9	(402)	[1]	(202)
Equity [abstract]
Deficit arising on cashless exercise of warrants in 2013					(263)
All other retained earnings (deficit)					(139)
Issue of common shares upon exercise of options and Dividend Reinvestment Plan		9
Stock-based compensation				1
Stock options exercised	2			(2)
Earnings	436				436
Common share dividends					(101)
Other comprehensive income (loss)	26						26
Balance, end of year at Dec. 31, 2017	$ 1,019	$ 1,350	$ (96)	$ 8	(67)	[1]	$ (176)
Equity [abstract]
Deficit arising on cashless exercise of warrants in 2013					(263)
All other retained earnings (deficit)					$ 196

[1] (i) Retained deficit comprised of: Deficit arising on cashless exercise of warrants in 201314$(263) $(263)All other retained earnings (deficit) 196 (139) $(67) $(402)

XML

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Operating activities
Earnings	$ 436	$ 183
Items not affecting cash:
Depreciation and amortization	107	94
Deferred income tax	(9)	57
Gain on asset exchange	0	(16)
Loss on disposal of assets	12	0
Other items	(8)	(2)
Cash flows from (used in) operations	538	316
Net change in non-cash operating working capital balances	(18)	(5)
Net change in taxes receivable, taxes payable and investment tax credit receivable	88	2
Cash flows from (used in) operating activities	608	313
Investing activities
Investment in property, plant and equipment	(240)	(95)
Investment in intangible assets	(4)	(6)
Proceeds received on asset exchange	0	7
Cash flows from (used in) investing activities	(244)	(94)
Financing activities
Common share dividends paid	(101)	(26)
Accounts receivable securitization repayments, net	(200)	0
Issue of common shares	7	4
Accounts receivable securitization repayments, net	0	(30)
Cash flows from (used in) financing activities	(294)	(52)
Foreign exchange revaluation on cash and cash equivalents held	10	(15)
Increase during year	80	152
Balance, beginning of year	161	9
Balance, end of year	$ 241	$ 161

XML

NATURE AND DESCRIPTION OF THE COMPANY

12 Months Ended

Dec. 31, 2017

Corporate Information And Statement Of IFRS Compliance [Abstract]

NATURE AND DESCRIPTION OF THE COMPANY

NATURE AND DESCRIPTION OF THE COMPANY

Norbord is an international producer of wood-based panels with 17 mills in the United States, Europe and Canada. Norbord is a publicly traded company listed on the Toronto Stock Exchange (TSX) and the New York Stock Exchange (NYSE). The ticker symbol on both exchanges is “OSB”. The Company is incorporated under the Canada Business Corporations Act and is headquartered in Toronto, Ontario, Canada.

At year-end, Brookfield's interest was approximately 40% of the outstanding common shares of the Company (see note 20).

XML

SIGNIFICANT ACCOUNTING POLICIES

12 Months Ended

Dec. 31, 2017

Significant Accounting Policies [Abstract]

SIGNIFICANT ACCOUNTING POLICIES

SIGNIFICANT ACCOUNTING POLICIES

(a)      Statement of Compliance

These consolidated financial statements have been prepared in accordance with International Financial Reporting Standards (IFRS) as issued by the International Accounting Standards Board (IASB) and with Interpretations of the International Financial Reporting Interpretations Committee. These financial statements were authorized for issuance by the Board of Directors of the Company on February 1, 2018.

(b)      Basis of Presentation

These consolidated financial statements include the accounts of the Company and all of its wholly-owned subsidiaries.

(c)      Basis of Measurement

These consolidated financial statements have been prepared on the historical cost basis except for certain financial instruments, which are measured at fair value (as described in note 18).

(d)      Functional and Presentation Currency

The US dollar is the presentation currency of the Company. Each of the Company’s subsidiaries determines its functional currency, and items included in the financial statements of each subsidiary are measured using that functional currency. The functional currency of North American operations is the US dollar and the functional currency of European operations is the Pound Sterling.

(e)      Foreign Currency Translation

Assets and liabilities of foreign operations having a functional currency other than the US dollar are translated at the rate of exchange prevailing at the reporting date, and revenues and expenses at average rates during the period. Gains or losses on translation are included as a component of shareholders’ equity in other comprehensive income (OCI). Gains or losses on foreign currency-denominated balances and transactions that are designated as hedges of net investments in these operations are reported in the same manner.

Foreign currency-denominated monetary assets and liabilities of the Company and its subsidiaries are translated using the rate of exchange prevailing at the reporting date. Gains or losses on translation of these items are included in earnings and reported as general and administrative expenses, with the exception of gains and losses on translation of foreign currency-denominated deferred tax assets and liabilities, taxes payable and receivable, and investment tax credit receivable. Gains and losses on these items are included in earnings and reported as income tax expense (previously reported as general and administrative expenses). Gains or losses on transactions that hedge these items are also included in earnings. Foreign currency-denominated revenue and expenses are translated at average rates during the period. Foreign currency-denominated non-monetary assets and liabilities, measured at historic cost, are translated at the rate of exchange at the transaction date. Foreign exchange gains or losses arising from intercompany loans to foreign operations, the settlement of which is neither planned nor likely to occur in the foreseeable future and which in substance are considered to form part of the net investment in the foreign operation, are recognized in OCI.

(f)      Cash and Cash Equivalents

Cash and cash equivalents consist of demand deposits, and investment-grade money market securities and bank term deposits with maturities of 90 days or less from the date of purchase. Cash and cash equivalents are recorded at fair value.

(g)      Inventories

Inventories of finished goods, raw materials and operating and maintenance supplies are valued at the lower of cost and net realizable value, with cost determined on an average cost basis. The cost of finished goods inventories includes direct material, direct labour and an allocation of overhead.

(h)      Property, Plant and Equipment

Property, plant and equipment is recorded at cost less accumulated depreciation. Borrowing costs are included as part of the cost of a qualifying asset. Property and plant includes land and buildings. Buildings are depreciated on a straight-line basis over 20 to 40 years. Production equipment is depreciated using the units-of-production method. This method amortizes the cost of equipment over the estimated units to be produced during its estimated useful life, which ranges from 10 to 25 years. When parts of an item of property, plant and equipment have different useful lives, they are accounted for as separate items (major components) of property, plant and equipment. The rates of depreciation are intended to fully depreciate manufacturing and non-manufacturing assets over their useful lives. These periods are assessed at least annually to ensure that they continue to approximate the useful lives of the related assets.

Property, plant and equipment is tested for impairment only when there is an indication of impairment. Impairment testing is a one-step approach for both testing and measurement, with the carrying value of the asset or group of assets compared directly to the higher of fair value less costs of disposal and value in use. Fair value is measured at the sale price of the asset or group of assets in an arm’s length transaction. Value in use is based on the cash flows of the asset or group of assets, discounted to their present value using a pre-tax discount rate that reflects current market assessments of the time value of money and the risks specific to the asset. The projection of future cash flows takes into account the relevant operating plans and management’s best estimate of the most probable set of conditions anticipated to prevail. Where an impairment loss exists, it is recorded against earnings. If an impairment loss subsequently reverses, the carrying amount of the asset is increased to the lesser of the revised estimate of recoverable amount and the carrying value that would have remained had no impairment loss been recognized previously. IFRS requires such reversals to be recognized in earnings if certain criteria are met.

(i)      Intangible Assets

Intangible assets consist of timber rights and software acquisition and development costs. Intangible assets are recorded at cost less accumulated amortization. Timber rights are amortized in accordance with the substance of the agreements (either on a straight-line basis or based on the volume of timber harvested). Software costs are amortized on a straight-line basis over their estimated useful lives and commence once the software is put into service. Amortization methods, useful lives and residual values are assessed at least annually. If the Company identifies events or changes in circumstances which may indicate that their carrying amount may not be recoverable, the intangible assets would be reviewed for impairment as described in note 2(h) above.

(j)      Reforestation Obligations

For certain operations, timber is harvested under various licences issued by the provinces of British Columbia and Alberta, which include future requirements for reforestation. The fair value of the future estimated reforestation obligation is accrued and recognized in cost of sales on the basis of the volume of timber harvested; fair value is determined by discounting the estimated future cash flows using a credit adjusted risk-free rate. Subsequent changes to fair value resulting from the passage of time and revisions to fair value calculations are recognized in earnings as they occur.

(k)      Employee Future Benefits

Norbord sponsors various defined benefit and defined contribution pension plans, which cover substantially all employees and are funded in accordance with applicable plan and regulatory requirements. The benefits under Norbord’s defined benefit pension plans are generally based on an employee’s length of service and final five years’ or career average salary. The plans do not provide for indexation of benefit payments.

The measurement date for all defined benefit pension plans is December 31. The obligations associated with Norbord’s defined benefit pension plans are actuarially valued using the projected unit credit method, management’s best estimate assumptions for salary escalation, inflation and life expectancy, and a current market discount rate. Assets are measured at fair value. The obligation in excess of plan assets is recorded as a liability and any plans with assets in excess of obligations are recorded as an asset. All actuarial gains or losses are recognized immediately through OCI.

(l)      Financial Instruments

The Company periodically utilizes derivative financial instruments solely to manage its foreign currency, interest rate and commodity price exposures in the ordinary course of business. Derivatives are not used for trading or speculative purposes. All hedging relationships, risk management objectives and hedging strategies are formally documented and periodically assessed to ensure that the changes in the value of these derivatives are highly effective in offsetting changes in the fair values, net investments or cash flows of the hedged exposures. Accordingly, all gains and losses (realized and unrealized, as applicable) on such derivatives are recognized in the same manner as gains and losses on the underlying exposure being hedged. Any resulting carrying amounts are included in other assets if there is an unrealized gain on the derivative, or in other liabilities if there is an unrealized loss on the derivative.

The fair values of the Company’s derivative financial instruments are determined by using observable market inputs for similar assets and liabilities. These fair values reflect the estimated amount that the Company would have paid or received if required to settle all outstanding contracts at period-end. The fair value measurements of the Company’s derivative financial instruments are classified as Level 2 of a three-level hierarchy, as fair value of these derivative instruments has been determined based on observable market inputs. This fair value represents a point-in-time estimate that may not be relevant in predicting the Company’s future earnings or cash flows.

The Company is exposed to credit risk in the event of non-performance by its derivative counterparties. However, the Company’s Board-approved financial policies require that derivative transactions be executed only with approved highly rated counterparties under master netting agreements; therefore, the Company does not anticipate any non-performance.

The carrying value of the Company’s non-derivative financial instruments approximates fair value, except where disclosed in these notes. Fair values disclosed are determined using actual quoted market prices or, if not available, indicative prices based on similar publicly traded instruments.

(m)      Debt Issue Costs

The Company accounts for transaction costs that are directly attributable to the issuance of long-term debt by deducting such costs from the carrying value of the long-term debt. The capitalized transaction costs are amortized to interest expense over the term of the related long-term debt using the effective interest rate method.

(n)      Income Taxes

The Company uses the asset and liability method of accounting for income taxes and provides for temporary differences between the tax basis and carrying amounts of assets and liabilities. Accordingly, deferred tax assets and liabilities are recognized for all deductible temporary differences, carryforward of unused tax credits and unused tax losses to the extent that it is probable that the deductions, tax credits and tax losses can be utilized. Deferred tax assets and liabilities are measured using enacted or substantively enacted tax rates expected to apply to the year when the asset is realized or the liability is settled, based on the tax rates and laws that have been enacted or substantively enacted at the balance sheet date. In addition, the effect of a change in tax rates on deferred tax assets and liabilities is recognized in earnings in the year of enactment or substantive enactment. Current and deferred income taxes relating to items recognized directly in other comprehensive income are also recognized directly in other comprehensive income. The Company assesses recoverability of deferred tax assets based on the Company’s estimates and assumptions. At the end of each reporting period, the Company reassesses unrecognized deferred tax assets. Previously unrecognized tax assets are recognized to the extent that it has become probable that future taxable profit will support their realization, or derecognized to the extent it is no longer probable that the tax assets will be recovered.

The Company has certain non-monetary assets and liabilities for which the tax reporting currency is different from the functional currency. Translation gains or losses arising on the remeasurement of these items at current exchange rates versus historic exchange rates give rise to a temporary difference for which a deferred tax asset or liability and deferred tax expense (recovery) is recorded.

(o)      Share-based Payments

The Company issues both equity-settled and cash-settled share-based awards to certain employees, officers and Directors. Both types of awards are accounted for using the fair value method.

Equity-settled share-based awards are issued in the form of stock options that vest evenly over a five-year period. The fair value of the awards on the grant date is determined using a fair value model (Black-Scholes option pricing model). Each tranche of the award is considered to be a separate grant based on its respective vesting period. The fair value of each tranche is determined separately on the date of grant and recognized as compensation expense, net of forfeiture estimate, over the term of its respective vesting period, with a corresponding increase to contributed surplus. Upon exercise of the award, the issued shares are recorded at the corresponding amount in contributed surplus, plus the cash proceeds received.

Cash-settled share-based awards are issued in the form of restricted stock units (RSUs) and deferred stock units (DSUs). The fair value of the liability for RSUs is determined using the Black-Scholes option pricing model. The liabilities for the DSUs are fair valued using the closing price of the Company’s common shares on the grant date. DSUs are initially measured at fair value at the grant date, and subsequently remeasured to fair value at each reporting date until settlement. The liability related to cash-settled awards is recorded in other liabilities.

(p)      Revenue Recognition

Sales are recognized when the risks and rewards of ownership pass to the purchaser. This is generally when goods are shipped. Sales are recorded net of discounts.

Sales are governed by contract or by standard industry terms. Revenue is not recognized prior to the completion of those terms. The majority of product is shipped via third-party transport on a freight-on-board shipping point basis. In all cases, product is subject to quality testing by the Company to ensure it meets applicable standards prior to shipment.

(q)      Government Grants

Government grants relating to the acquisition of property, plant and equipment are recorded as a reduction of the cost of the asset to which it relates, with any depreciation calculated on the net amount over the related asset’s useful life. Government grants relating to income or for the reimbursement of costs are recognized in earnings in the period they become receivable and deducted against the costs for which the grants were intended to compensate.

(r)      Impairment of Non-Derivative Financial Assets

Financial assets not classified at fair value through profit or loss are assessed at each reporting date to determine whether there is objective evidence of impairment.

(s)      Measurements of Fair Value

A number of the Company’s accounting policies and disclosures require the measurement of fair value, for both financial and non-financial assets and liabilities.

The Company has an established framework with respect to the measurement of fair values. If third-party information, such as broker quotes or pricing services, is used to measure fair values, then management assesses the evidence obtained from these sources to support the conclusion that such valuations meet the requirements of IFRS, including the level in the fair value hierarchy at which such valuations should be classified.

When measuring the fair value of an asset or a liability, the Company uses observable market data as far as possible. Fair values are categorized into different levels in a fair value hierarchy based on the inputs used in the valuation technique, as follows:

Level 1	–	unadjusted quoted prices available in active markets for identical assets or liabilities;
Level 2	–	inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly (i.e., as prices) or indirectly (i.e., derived from prices); and
Level 3	–	inputs for the asset or liability that are not based on observable market data (unobservable inputs).

(t)      Critical Judgements and Estimates

The preparation of the consolidated financial statements in conformity with IFRS requires management to make critical judgements, estimates and assumptions that affect: the reported amounts of assets, liabilities, revenues and expenses; disclosure of contingent assets and liabilities at the date of the financial statements; and the reported amounts of revenues and expenses during the period. Actual results could differ materially from those estimates. Such differences in estimates are recognized when realized on a prospective basis.

In making estimates and judgements, management relies on external information and observable conditions where possible, supplemented by internal analysis as required. These estimates and judgements have been applied in a manner consistent with prior periods and there are no known trends, commitments, events or uncertainties that we believe will materially affect the methodology or assumptions utilized in making these estimates and judgements in these financial statements. The significant estimates and judgements used in determining the recorded amount for assets and liabilities in the financial statements include the following:

A.    Judgements

Management’s judgements made in applying accounting policies that have the most significant effect on the amounts recognized in the consolidated financial statements are:

(i)Functional Currency

The Company assesses the relevant factors related to the primary economic environment in which its entities operate to determine their functional currency.

(ii)Income Taxes

In the normal course of operations, judgement is required in assessing tax interpretations, regulations and legislation and in determining the provision for income taxes, deferred tax assets and liabilities. These judgements are subject to various uncertainties concerning the interpretation and application of tax laws in the filing of its tax returns in operating jurisdictions, which could materially affect the Company’s earnings or cash flows. There can be no assurance that the tax authorities will not challenge the Company’s filing positions. To the extent that a recognition or derecognition of a deferred tax asset is required, current period earnings or OCI will be affected.

B.    Estimates

Assumptions and estimation uncertainties that have a significant risk of resulting in a material adjustment in the year ended December 31, 2017 are:

(i) Inventory

The Company estimates the net realizable value of its finished goods and raw materials inventory using estimates regarding future selling prices. The net realizable value of operating and maintenance supplies inventory uses estimates regarding replacement costs.

(ii) Property, Plant and Equipment and Intangible Assets

When indicators of impairment are present and the recoverable amount of property, plant and equipment and intangible assets need to be determined, the Company uses the following critical estimates: the timing of forecasted revenues; future selling prices and margins; future sales volumes; maintenance and other capital expenditures; discount rates; useful lives; and residual values.

(iii) Employee Benefit Plans

The net obligations associated with the defined benefit pension plans are actuarially valued using: the projected unit credit method; management’s best estimates for salary escalation, inflation and life expectancy; and a current market discount rate to match the timing and amount of pension payments.

(iv) Income Taxes

Current income tax assets and liabilities are measured at the amount expected to be paid to tax authorities, net of recoveries, based on the tax rates and laws enacted or substantively enacted at the balance sheet date.

Deferred income tax assets are recognized for all deductible temporary differences and carryforward of unused tax credits and unused tax losses, to the extent that it is probable that the deductions, tax credits and tax losses can be utilized. Deferred income tax assets and liabilities are measured at the tax rates that are expected to apply to the year when the asset is realized or the liability settled, based on the tax rates and laws that have been enacted or substantively enacted at the balance sheet date.

(v) Financial Instruments

The critical assumptions and estimates used in determining the fair value of financial instruments are: equity and commodity prices; future interest rates; the relative creditworthiness of the Company to its counterparties; estimated future cash flows; discount rates; and volatility utilized in option valuations.

(u) Changes in Accounting Policies

(i) Income Taxes

In January 2016, the IASB issued amendments to clarify the requirements for recognizing deferred tax assets on unrealized losses. The amendments clarify the accounting for deferred tax where an asset is measured at fair value and that fair value is below the asset’s tax base. They also clarify certain other aspects of accounting for deferred tax assets. The amendments became effective for the Company on January 1, 2017 and did not have any impact on its financial statements.

(ii) Cash Flow Statement Disclosure

In January 2016, the IASB issued an amendment to IAS 7, Statement of Cash Flows, introducing additional disclosure requirements for liabilities arising from financing activities. The amendments became effective for the Company on January 1, 2017 and the additional disclosure has been included in the supplemental cash flow information (note 16) accordingly.

(iii) Foreign Currency Translation

Effective April 2, 2017, the Company changed its policy on the classification of gains and losses on translation of foreign currency-denominated deferred tax assets and liabilities, taxes payable and receivable, and investment tax credit receivable. Gains and losses on these items are included in earnings and reported as income tax expense (previously reported as general and administrative expenses). The effect of this classification change on prior period comparative balances was $1 million and the balances were not required to be restated.

(v) Future Changes in Accounting Policies

(i)Financial Instruments

In July 2014, the IASB issued the final publication of IFRS 9, Financial Instruments (IFRS 9), superseding IAS 39, Financial Instruments. IFRS 9 includes amended guidance for the classification and measurement of financial assets by introducing a fair value through other comprehensive income category for certain debt instruments. It also includes a new general hedge accounting standard which will align hedge accounting more closely with risk management and contains a new impairment model which could result in earlier recognition of losses. Norbord intends to adopt IFRS 9 in its financial statements for the annual period beginning on January 1, 2018. Norbord has assessed its financial instruments and does not expect the standard to have a material impact on its financial statements or accounting policy.

(ii)Revenue from Contracts with Customers

In May 2014, the IASB issued IFRS 15, Revenue from Contracts with Customers (IFRS 15), which replaces the existing revenue recognition guidance with a new framework to determine the timing of revenue recognition and the measurement of revenue. In September 2015, the IASB formalized a one-year deferral of the effective date to the year beginning on or after January 1, 2018. In April 2016, the IASB issued an amendment clarifying the guidance on identifying performance obligations, licences of intellectual property, and principal versus agent, and to provide additional practical expedients upon transition. Norbord intends to adopt IFRS 15 and the clarifications in its financial statements for the annual period beginning on January 1, 2018. Norbord has undertaken a comprehensive review of its significant contracts in accordance with the five-step model in IFRS 15 to determine the impact on the timing and measurement of its revenue recognition. Based on this review, Norbord does not expect the standard to have a material impact on its financial statements or accounting policy.

(iii)Share-based Payment

In June 2016, the IASB issued an amendment to IFRS 2, Share-based Payment, clarifying the accounting for certain types of share-based payment transactions. The amendments provide requirements on accounting for the effects of vesting and non-vesting conditions of cash-settled share-based payments, withholding tax obligations for share-based payments with a net settlement feature, and when a modification to the terms of a share-based payment changes the classification of the transaction from cash-settled to equity-settled. Norbord intends to adopt the amendments to IFRS 2 in its financial statements for the annual period beginning on January 1, 2018. Norbord has assessed its share-based payment transactions and does not expect the amendments to have a material impact on its financial statements or accounting policy.

(iv)Foreign Currency Transactions and Advance Consideration

In December 2016, the IFRS Interpretations Committee of the IASB issued IFRIC 22, Foreign Currency Transactions and Advance Consideration (IFRIC 22). The interpretation addresses how to determine the date of the transaction when applying IAS 21, The Effects of Changes in Foreign Exchange Rates. The date of transaction determines the exchange rate to be used on initial recognition of the related asset, expense or income. Norbord intends to adopt IFRIC 22 in its financial statements for the annual period beginning on January 1, 2018. Norbord has assessed its foreign currency transactions and does not expect the interpretation to have a material impact on its financial statements or accounting policy.

(v)Leases

In January 2016, the IASB issued IFRS 16, Leases (IFRS 16), which replaces the existing lease accounting guidance. IFRS 16 requires all leases to be reported on the balance sheet unless certain criteria for exclusion are met. Norbord intends to adopt IFRS 16 in its financial statements for the annual period beginning on January 1, 2019. The Company is currently assessing the impact of IFRS 16 on its financial statements.

(vi) Uncertainty over Income Tax Treatments

In June 2017, the IFRS Interpretations Committee of the IASB issued IFRIC 23, Uncertainty over Income Tax Treatments (IFRIC 23). The interpretation provides guidance on the accounting for current and deferred tax liabilities and assets in circumstances in which there is uncertainty over income tax treatments. The interpretation is effective for the annual period beginning on January 1, 2019. The Company is currently assessing the impact of IFRIC 23 on its financial statements.

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ACCOUNTS RECEIVABLE

12 Months Ended

Dec. 31, 2017

Subclassifications of assets, liabilities and equities [abstract]

ACCOUNTS RECEIVABLE

ACCOUNTS RECEIVABLE

The Company has a $125 million multi-currency accounts receivable securitization program with a third-party trust sponsored by a highly rated Canadian financial institution. The program is revolving and has an evergreen commitment subject to termination on 12 months’ notice. Under the program, Norbord has transferred substantially all of its present and future trade accounts receivable to the trust, on a fully serviced basis, for proceeds consisting of cash and deferred purchase price. However, the asset derecognition criteria under IFRS have not been met and the transferred accounts receivable remain recorded as an asset.

At year-end, Norbord had transferred but continued to recognize $153 million (December 31, 2016 – $125 million) in trade accounts receivable, and Norbord recorded drawings of $nil as other long-term debt (December 31, 2016 – $nil) relating to this financing program. The level of accounts receivable transferred under the program fluctuates with the level of shipment volumes, product prices and foreign exchange rates. The amount Norbord chooses to draw under the program at any point in time depends on the level of accounts receivable transferred and timing of cash settlements and fluctuates with the Company’s cash requirements. Any drawings are presented as other long-term debt on the balance sheet and are excluded from the net debt to capitalization calculation for financial covenant purposes (note 17). The utilization charge, which is based on money market rates plus a margin, and other program fees are recorded as finance costs. For the year, the utilization charge on drawings ranged from 1.5% to 2.6%.

The securitization program contains no financial covenants; however, the program is subject to minimum credit-rating requirements. The Company must maintain a long-term issuer credit rating of at least single B (mid) or the equivalent. As at February 1, 2018, Norbord’s ratings were BB (DBRS), BB (Standard & Poor’s Ratings Services) and Ba1 (Moody’s Investors Service).

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INVENTORY

12 Months Ended

Dec. 31, 2017

Inventories [Abstract]

INVENTORY

INVENTORY

(US $ millions)	Dec 31, 2017		Dec 31, 2016
Raw materials	$	68	$	55
Finished goods	74		61
Operating and maintenance supplies	82		69
	$	224	$	185

At year-end, the provision to reflect inventories at the lower of cost and net realizable value was $14 million (December 31, 2016 – $10 million). The change in inventory provision of $4 million (2016 – $nil) has been recognized in loss on disposal of assets on the statement of earnings.

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PROPERTY, PLANT AND EQUIPMENT

12 Months Ended

Dec. 31, 2017

Property, plant and equipment [abstract]

PROPERTY, PLANT AND EQUIPMENT

PROPERTY, PLANT AND EQUIPMENT

(US $ millions)	Note	Land			Buildings			Production Equipment			Construction in Progress			Total
Cost
December 31, 2015		$	12		$	300		$	1,276		$	95		$	1,683
Additions(1)		—			—			—			101			101
Net change from asset exchange	22	1			5			4			—			10
Disposals		—			—			(3		)	—			(3		)
Transfers		—			8			49			(57		)	—
Effect of foreign exchange		(1		)	(2		)	(43		)	(3		)	(49		)
December 31, 2016		12			311			1,283			136			1,742
Additions(1)		—			—			1			252			253
Disposals		—			(2		)	(16		)	—			(18		)
Transfers		—			31			268			(299		)	—
Effect of foreign exchange		—			3			13			9			25
December 31, 2017		$	12		$	343		$	1,549		$	98		$	2,002
Accumulated depreciation
December 31, 2015		$	—		$	85		$	338		$	—		$	423
Depreciation		—			16			76			—			92
Disposals		—			—			(3		)	—			(3		)
Net change from asset exchange	22	—			(1		)	—			—			(1		)
Effect of foreign exchange		—			—			(31		)	—			(31		)
December 31, 2016		—			100			380			—			480
Depreciation		—			17			88			—			105
Disposals		—			—			(10		)	—			(10		)
Effect of foreign exchange		—			1			5			—			6
December 31, 2017		$	—		$	118		$	463		$	—		$	581
Net
December 31, 2016		$	12		$	211		$	903		$	136		$	1,262
December 31, 2017		12			225			1,086			98			1,421

⁽¹⁾ Net of government grants of $13 million (2016 – $3 million) received or receivable related to the Inverness expansion project.

In 2017, interest costs of $7 million (2016 – $1 million) were capitalized and included in the cost of qualifying assets within additions.

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INTANGIBLE ASSETS

12 Months Ended

Dec. 31, 2017

Intangible Assets [Abstract]

INTANGIBLE ASSETS

INTANGIBLE ASSETS

(US $ millions)	Cost			Accumulated  Amortization			Net Book Value
December 31, 2015	$	34		$	16		$	18
Additions	6			2			4
Disposals	(1		)	(1		)	—
December 31, 2016	39			17			22
Additions	4			2			2
Effect of foreign exchange	1			1			—
December 31, 2017	$	44		$	20		$	24

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OTHER ASSETS

12 Months Ended

Dec. 31, 2017

Subclassifications of assets, liabilities and equities [abstract]

OTHER ASSETS

OTHER ASSETS

(US $ millions)	Note	Dec 31, 2017		Dec 31, 2016
Defined benefit pension asset	10	$	2	$	—
Foreign currency forward contracts	18	1		—
Investment tax credit receivable		—		13
Other		—		1
		$	3	$	14

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LONG-TERM DEBT

12 Months Ended

Dec. 31, 2017

Financial Instruments [Abstract]

LONG-TERM DEBT

LONG-TERM DEBT

(US $ millions)	Dec 31, 2017			Dec 31, 2016
Principal value
7.7% senior secured notes due February 2017	$	—		$	200
5.375% senior secured notes due December 2020	240			240
6.25% senior secured notes due April 2023	315			315
	555			755
Less: Unamortized debt issue costs	(7		)	(9		)
Less: Current portion	—			(200		)
	$	548		$	546

Maturities of long-term debt are as follows:

(US $ millions)	2018		2019		2020		2021		2022		Thereafter		Total
Maturities of long-term debt	$	—	$	—	$	240	$	—	$	—	$	315	$	555

As at December 31, 2017, the weighted average effective interest rate on the Company’s debt-related obligations was 5.9% (2016 – 6.4%).

Senior Secured Notes Due 2017

The Company’s senior secured notes due in February 2017 bore a fixed interest rate that varied with the changes in the Company’s credit ratings. In 2017 and 2016, the interest rate was 7.70%. In February 2017, the Company repaid these notes at maturity.

Senior Secured Notes Due 2020

The Company’s senior secured notes due in December 2020 bear a fixed interest rate of 5.375%. The notes rank pari passu with the Company’s existing senior secured notes due in 2023 and committed revolving bank lines.

Senior Secured Notes Due 2023

The Company’s senior secured notes due in April 2023 bear a fixed interest rate of 6.25%. The notes rank pari passu with the Company’s existing senior secured notes due in 2020 and committed revolving bank lines.

Revolving Bank Lines

The Company has an aggregate commitment of $245 million under committed revolving bank lines which bear interest at money market rates plus a margin that varies with the Company’s credit rating. The maturity date of the total aggregate commitment is May 2019. The bank lines are secured by a first lien on the Company’s North American OSB inventory and property, plant and equipment. This lien is shared pari passu with holders of the 2020 and 2023 senior secured notes.

At year-end, none of the revolving bank lines were drawn as cash, $19 million (2016 – $25 million) was utilized for letters of credit and $226 million (2016 – $220 million) was available to support short-term liquidity requirements.

The revolving bank lines contain two quarterly financial covenants: minimum tangible net worth of $500 million and maximum net debt to total capitalization, book basis (note 17), of 65%. The Company was in compliance with the financial covenants at year-end.

Debt Issue Costs

Finance expense related to amortization of debt issue costs for 2017 was $2 million (2016 – $2 million).

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OTHER LIABILITIES

12 Months Ended

Dec. 31, 2017

Subclassifications of assets, liabilities and equities [abstract]

OTHER LIABILITIES

OTHER LIABILITIES

(US $ millions)	Note	Dec 31, 2017		Dec 31, 2016
Defined benefit pension obligation	10	$	20	$	18
Accrued employee benefits	14	6		5
Reforestation obligation		2		2
Other		1		2
		$	29	$	27

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EMPLOYEE BENEFIT PLANS

12 Months Ended

Dec. 31, 2017

Employee Benefits [Abstract]

EMPLOYEE BENEFIT PLANS

EMPLOYEE BENEFIT PLANS

Pension Plans

Norbord has a number of pension plans in which participation is available to substantially all employees. Norbord’s obligations under its defined benefit pension plans are determined periodically through the preparation of actuarial valuations. All of Norbord’s pension plans are up-to-date on their actuarial valuations in accordance with regulatory requirements.

Information about Norbord’s defined benefit pension obligations and assets is as follows:

(US $ millions)	Note	2017			2016
Change in accrued benefit obligation during the year
Accrued benefit obligation, beginning of year		$	152		$	140
Current service cost		3			3
Interest on accrued benefit obligation		6			6
Benefits paid		(12		)	(9		)
Net actuarial loss arising from changes to:
Financial assumptions		7			5
Increase arising from the asset exchange	22	—			6
Foreign currency exchange rate impact		11			1
Accrued benefit obligation, end of year(1)		$	167		$	152
Change in plan assets during the year
Plan assets, beginning of year		$	134		$	117
Interest income		5			5
Remeasurement gains:
Return on plan assets (excluding interest income)		5			10
Employer contributions		7			7
Benefits paid		(12		)	(9		)
Increase arising from the asset exchange	22	—			4
Foreign currency exchange rate impact		10			—
Plan assets, end of year(1)		$	149		$	134
Funded status
Accrued benefit obligation		$	167		$	152
Plan assets		(149		)	(134		)
Accrued benefit obligation in excess of plan assets(1)		$	18		$	18

⁽¹⁾ All plans have accrued benefit obligations in excess of plan assets with the exception of the UK plan, which has been presented as other assets.

The components of benefit expense recognized in the statement of earnings are as follows:

(US $ millions)	2017		2016
Current service cost	$	3	$	3
Interest cost	1		1
Net periodic pension expense	$	4	$	4

The significant weighted average actuarial assumptions are as follows:

	2017		2016
Used in calculation of accrued benefit obligation, end of year
Discount rate	3.4	%	3.7	%
Rate of compensation increase	2.9	%	2.8	%
Used in calculation of net periodic pension expense for the year
Discount rate	3.7	%	3.9	%
Rate of compensation increase	2.9	%	2.8	%

The impact of a change to the significant actuarial assumptions on the accrued benefit obligation as at December 31, 2017 is as follows:

(US $ millions)	Increase			Decrease
Discount rate (0.5% change)	$	(13	)	$	14
Compensation rate (1.0% change)	3			(3		)
Future life expectancy (1 year movement)	4			(4		)
Retirement age (1 year movement)	(2		)	—

The weighted average asset allocation of Norbord’s defined benefit pension plan assets is as follows:

	Dec 31, 2017		Dec 31, 2016
Asset category
Equity investments	55	%	57	%
Fixed income investments	45	%	40	%
Cash	—	%	3	%
Total assets	100	%	100	%

Cost of sales and general and administrative expenses include $12 million (2016 – $11 million) related to contributions to Norbord’s defined contribution pension plans.

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EMPLOYEE COMPENSATION AND BENEFITS

12 Months Ended

Dec. 31, 2017

Analysis of income and expense [abstract]

EMPLOYEE COMPENSATION AND BENEFITS

EMPLOYEE COMPENSATION AND BENEFITS

Included in cost of sales and general and administrative expenses are the following:

(US $ millions)	2017		2016
Short-term employee compensation and benefits	$	203	$	178
Long-term employee compensation and benefits	32		30
Share-based payments	2		2
	$	237	$	210

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FINANCE COSTS

12 Months Ended

Dec. 31, 2017

Analysis of income and expense [abstract]

FINANCE COSTS

FINANCE COSTS

The components of finance costs were as follows:

(US $ millions)	2017		2016
Interest on long-term debt(1)	$	27	$	47
Interest on other long-term debt	1		1
Amortization of debt issue costs	2		2
Revolving bank lines fees and other	1		1
	31		51
Net interest expense on net pension obligation	1		1
Total finance costs	$	32	$	52

⁽¹⁾ Net of capitalized interest of $7 million and $1 million, respectively (note 5).

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INCOME TAX

12 Months Ended

Dec. 31, 2017

Income Taxes [Abstract]

INCOME TAX

INCOME TAX

Deferred income tax balances reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities in the balance sheet and the amounts used for income tax purposes.

The source of deferred income tax balances is as follows:

(US $ millions)	Dec 31, 2017			Dec 31, 2016
Property, plant and equipment, differences in basis	$	(200	)	$	(248	)
Benefit of tax loss carryforwards	38			87
Other temporary differences in basis	15			8
Net deferred income tax liabilities	$	(147	)	$	(153	)

(US $ millions)	Dec 31, 2017			Dec 31, 2016
Deferred income tax assets	$	4		$	4
Deferred income tax liabilities	(151		)	(157		)
Net deferred income tax liabilities	$	(147	)	$	(153	)

As at December 31, 2017, the Company had the following approximate unused tax losses available to carry forward:

	Amount (millions)		Latest Expiry Year
Tax loss carryforwards
United States		US $149	2037
Canada – capital loss		C $126	Indefinite
Canada – non-capital loss		C $22	2037
Belgium		€32	Indefinite
United Kingdom		£1	Indefinite

The loss carryforwards may be utilized over the next several years to eliminate cash taxes otherwise payable. Certain deferred tax benefits relating to the above losses have been included in deferred income taxes in the consolidated financial statements. At each balance sheet date, the Company assesses its deferred income tax assets and recognizes the amounts that, in the judgement of management, are probable to be utilized. During the year, the Company recognized $14 million in net deferred tax assets (2016 – $2 million in net deferred assets recognized) relating to prior years’ losses and temporary differences. The Company also recognized $2 million net deferred tax liabilities (2016 – $7 million net deferred tax assets) related to items which were recorded in OCI. Of the total tax losses noted, the Company has not recognized €23 million (2016 – €23 million) in Belgium loss carryforwards and C $126 million (2016 – C $116 million) capital loss carryforwards and these unused tax loss carryforwards do not expire.

In addition, the Company has not recognized the following tax attributes with the expiry date, if applicable:

(US $ millions)
United States – State tax loss (2021–2037)(1)	$	303
United States – State tax credits (2019–2026)	60

⁽¹⁾ Aggregate loss from the states where Norbord's mills are located, excluding Texas.

The aggregate amount of temporary differences associated with investments in subsidiaries for which deferred tax liabilities have not been recognized as at December 31, 2017 is $869 million (December 31, 2016 – $698 million).

Income tax expense recognized in the statement of earnings comprises the following:

(US $ millions)	2017			2016
Current income tax expense	$	90		$	4
Deferred income tax (recovery) expense	(9		)	57
Income tax expense	$	81		$	61

As a result of the USTax Reform bill enacted in December 2017, the Company recognized a net income tax recovery of $35 million due to the impact of the US federal tax rate reduction from 35% to 21% on the remeasurement of deferred tax assets and liabilities. The income tax expense is calculated as follows:

(US $ millions)	2017			2016
Earnings before income tax	$	517		$	244
Income tax expense at combined Canadian federal and provincial statutory rate of 27% (2016 – 27%)	140			66
Effect of:
Change in tax rates and new legislation	(35		)	—
Rate differences on foreign activities	(12		)	(7		)
Recognition of the benefit of prior years’ tax losses and other deferred tax assets	(14		)	(2		)
Non-recognition of deferred tax assets relating to foreign exchange gain	1			2
Current income tax expense not previously recognized	—			2
Other	1			—
Income tax expense	$	81		$	61
Income tax (expense) recovery recognized in the statement of comprehensive income comprises the following:
(US $ millions)	2017			2016
Actuarial (loss) gain on post-employment obligation	$	(3	)	$	5
Tax	—			—
Net of tax	$	(3	)	$	5
Foreign currency translation gain (loss) on foreign operations	$	31		$	(44	)
Tax	(2		)	7
Net of tax	$	29		$	(37	)

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SHAREHOLDERS' EQUITY

12 Months Ended

Dec. 31, 2017

Share Capital, Reserves, And Other Equity Interest [Abstract]

SHAREHOLDERS' EQUITY

SHAREHOLDERS’ EQUITY

Share Capital

	2017			2016
	Shares (millions)	Amount (US $ millions)		Shares (millions)	Amount (US $ millions)
Common shares outstanding, beginning of year	85.8	$	1,341	85.4	$	1,334
Issuance of common shares upon exercise of options and Dividend Reinvestment Plan	0.6	9		0.4	7
Common shares outstanding, end of year	86.4	$	1,350	85.8	$	1,341

As at December 31, 2017, the authorized capital stock of the Company is as follows: an unlimited number of Class A and Class B preferred shares, an unlimited number of non-voting participating shares and an unlimited number of common shares.

Dividend Reinvestment Plan

During the year, less than $1 million of dividends was reinvested in common shares (2016 – less than $1 million).

Merger Reserve

On March 31, 2015, the Company and Ainsworth Lumber Co. Ltd. (Ainsworth) completed an arrangement under which the Company acquired all of the outstanding common shares of Ainsworth in an all-share transaction. The Company elected not to account for this transaction as a business combination under IFRS 3, Business Combinations, as the transaction represented a combination of entities under common control of Brookfield. Accordingly, the book values of the two entities were combined and no adjustments were made to reflect fair values or to recognize any new assets or liabilities of either entity.

The merger reserve represents the difference between the fair value of the Norbord common shares on the date of issuance and the book value of Ainsworth’s net assets exchanged.

Contributed Surplus

Contributed surplus at December 31, 2017 comprises amounts related to compensation expense on stock options issued under the Company’s stock option plan.

Share-based Payments

Stock Options

	2017				2016
	Options (millions)		Weighted Average Exercise Price (C $)		Options (millions)		Weighted Average Exercise Price (C $)
Balance, beginning of year	1.8		$	25.28	2.3		$	24.79
Options granted	0.2		34.96		—		—
Options exercised	(0.6	)	15.16		(0.4	)	14.93
Options expired	—		—		(0.1	)	111.30
Balance, end of year	1.4		$	27.23	1.8		$	25.28
Exercisable at year-end	0.8		$	25.03	1.2		$	25.18

Under the Company’s stock option plan, the Board of Directors may issue stock options to certain employees of the Company. These options vest over a five-year period and expire 10 years from the date of issue. During the year, $0.2 million stock options were granted (2016 – no stock options) and stock option expense of $1 million was recorded with a corresponding increase in contributed surplus (2016 – $1 million).

The table below outlines the significant assumptions used during the period to estimate the fair value of options granted:

	2017			2016
Risk-free interest rate	1.1		%	—
Expected volatility	30		%	—
Dividend yield	1.1		%	—
Expected option life (years)	5			—
Share price (in Canadian dollars)		$37.72		—
Exercise price (in Canadian dollars)		$34.96		—
Weighted average fair value per option granted (in Canadian dollars)		$ 7.47		—

In 2017, 0.6 million common shares (2016 – 0.4 million common shares) were issued as a result of options exercised under the stock option plan for total cash proceeds of $7 million (2016 – $4 million) plus $2 million (2016 – $3 million) representing the vested fair value of the stock options. The weighted average share price on the date of exercise for 2017 was $41.89 (2016 – $31.71).

The following table summarizes the weighted average exercise prices and the weighted average remaining contractual life of the stock options outstanding at December 31, 2017:

		Options Outstanding			Options Exercisable
Range of Exercise Prices (C $)	Options	Weighted Average Remaining Contractual Life (years)	Weighted Average Exercise Price (C $)		Options	Weighted Average Exercise Price (C $)
$6.50–$10.00	157,000	4.08	$	9.96	157,000	$	9.96
$10.01–$15.00	129,862	2.98	14.58		129,862	14.58
$15.01–$20.00	108,210	2.22	18.04		108,210	18.04
$20.01–$25.00	11,409	6.45	21.44		11,409	21.44
$25.01–$30.00	457,420	7.42	27.25		172,420	27.32
$30.01–$35.00	458,696	7.16	32.35		158,702	30.53
$60.90	90,630	0.10	60.90		90,630	60.90
	1,413,227	6.00	$	27.23	828,233	$	25.03

Restricted and Deferred Stock Units

The Company has a Restricted Stock Unit (RSU) Plan for designated employees of the Company or its subsidiaries. An RSU is a unit equivalent in value to a common share. Units credited under this plan vest equally over three years. Vested amounts are paid in cash within 30 days of the vesting date. In addition, holders are credited with additional units as and when dividends are paid on the Company’s common shares.

The Company also has a Deferred Common Share Unit (DSU) Plan for senior management and Directors. A DSU is a unit equivalent in value to a common share. Following the participant’s termination of employment with the Company, the participant will be paid in cash the market value of the common shares represented by the DSUs. In addition, holders are credited with additional units as and when dividends are paid on the Company’s common shares.

As at December 31, 2017, the total liability outstanding related to these plans was $5 million (December 31, 2016 – $4 million), of which $3 million (December 31, 2016 – $3 million) is recorded in other liabilities and $2 million (December 31, 2016 – $1 million) is recorded in accounts payable and accrued liabilities.

Accumulated Other Comprehensive Loss

(US $ millions)	Dec 31, 2017			Dec 31, 2016
Foreign currency translation loss on investment in foreign operations, net of tax of $(5) (December 31, 2016 – $(3))	$	(138	)	$	(167	)
Net loss on hedge of net investment in foreign operations, net of tax of $3 (December 31, 2016 – $3)	(8		)	(8		)
Actuarial loss on defined benefit pension obligation, net of tax of $9 (December 31, 2016 – $9)	(30		)	(27		)
Accumulated other comprehensive loss, net of tax	$	(176	)	$	(202	)

Amendment to Warrant Indenture

On March 25, 2013, the Company amended certain terms of its Warrant Indenture dated December 24, 2008 by executing a Supplemental Warrant Indenture to include a cashless exercise feature. This feature allowed warrant holders to elect to exercise their warrants on a cashless basis, and receive common shares based on the in-the-money value of their warrants. The warrants expired on December 24, 2013. In 2013, a total of 134.4 million warrants were exercised on a cashless basis resulting in the issuance of 8.4 million common shares. As required under IFRS, for the year ended December 31, 2013, the cashless exercise of the warrants resulted in:

• an increase in share capital of $298 million, representing the fair value on the date of exercise of the common shares issued in exchange for the in-the-money value of the warrants;

• a decrease in contributed surplus of $35 million, representing the book value of the warrants recorded at the time of their issuance; and

• a decrease in retained earnings of $263 million, reflecting the difference between these two amounts.

SHAREHOLDERS' EQUITY

SHAREHOLDERS’ EQUITY

Share Capital

	2017			2016
	Shares (millions)	Amount (US $ millions)		Shares (millions)	Amount (US $ millions)
Common shares outstanding, beginning of year	85.8	$	1,341	85.4	$	1,334
Issuance of common shares upon exercise of options and Dividend Reinvestment Plan	0.6	9		0.4	7
Common shares outstanding, end of year	86.4	$	1,350	85.8	$	1,341

As at December 31, 2017, the authorized capital stock of the Company is as follows: an unlimited number of Class A and Class B preferred shares, an unlimited number of non-voting participating shares and an unlimited number of common shares.

Dividend Reinvestment Plan

During the year, less than $1 million of dividends was reinvested in common shares (2016 – less than $1 million).

Merger Reserve

On March 31, 2015, the Company and Ainsworth Lumber Co. Ltd. (Ainsworth) completed an arrangement under which the Company acquired all of the outstanding common shares of Ainsworth in an all-share transaction. The Company elected not to account for this transaction as a business combination under IFRS 3, Business Combinations, as the transaction represented a combination of entities under common control of Brookfield. Accordingly, the book values of the two entities were combined and no adjustments were made to reflect fair values or to recognize any new assets or liabilities of either entity.

The merger reserve represents the difference between the fair value of the Norbord common shares on the date of issuance and the book value of Ainsworth’s net assets exchanged.

Contributed Surplus

Contributed surplus at December 31, 2017 comprises amounts related to compensation expense on stock options issued under the Company’s stock option plan.

Share-based Payments

Stock Options

	2017				2016
	Options (millions)		Weighted Average Exercise Price (C $)		Options (millions)		Weighted Average Exercise Price (C $)
Balance, beginning of year	1.8		$	25.28	2.3		$	24.79
Options granted	0.2		34.96		—		—
Options exercised	(0.6	)	15.16		(0.4	)	14.93
Options expired	—		—		(0.1	)	111.30
Balance, end of year	1.4		$	27.23	1.8		$	25.28
Exercisable at year-end	0.8		$	25.03	1.2		$	25.18

Under the Company’s stock option plan, the Board of Directors may issue stock options to certain employees of the Company. These options vest over a five-year period and expire 10 years from the date of issue. During the year, $0.2 million stock options were granted (2016 – no stock options) and stock option expense of $1 million was recorded with a corresponding increase in contributed surplus (2016 – $1 million).

The table below outlines the significant assumptions used during the period to estimate the fair value of options granted:

	2017			2016
Risk-free interest rate	1.1		%	—
Expected volatility	30		%	—
Dividend yield	1.1		%	—
Expected option life (years)	5			—
Share price (in Canadian dollars)		$37.72		—
Exercise price (in Canadian dollars)		$34.96		—
Weighted average fair value per option granted (in Canadian dollars)		$ 7.47		—

In 2017, 0.6 million common shares (2016 – 0.4 million common shares) were issued as a result of options exercised under the stock option plan for total cash proceeds of $7 million (2016 – $4 million) plus $2 million (2016 – $3 million) representing the vested fair value of the stock options. The weighted average share price on the date of exercise for 2017 was $41.89 (2016 – $31.71).

The following table summarizes the weighted average exercise prices and the weighted average remaining contractual life of the stock options outstanding at December 31, 2017:

		Options Outstanding			Options Exercisable
Range of Exercise Prices (C $)	Options	Weighted Average Remaining Contractual Life (years)	Weighted Average Exercise Price (C $)		Options	Weighted Average Exercise Price (C $)
$6.50–$10.00	157,000	4.08	$	9.96	157,000	$	9.96
$10.01–$15.00	129,862	2.98	14.58		129,862	14.58
$15.01–$20.00	108,210	2.22	18.04		108,210	18.04
$20.01–$25.00	11,409	6.45	21.44		11,409	21.44
$25.01–$30.00	457,420	7.42	27.25		172,420	27.32
$30.01–$35.00	458,696	7.16	32.35		158,702	30.53
$60.90	90,630	0.10	60.90		90,630	60.90
	1,413,227	6.00	$	27.23	828,233	$	25.03

Restricted and Deferred Stock Units

The Company has a Restricted Stock Unit (RSU) Plan for designated employees of the Company or its subsidiaries. An RSU is a unit equivalent in value to a common share. Units credited under this plan vest equally over three years. Vested amounts are paid in cash within 30 days of the vesting date. In addition, holders are credited with additional units as and when dividends are paid on the Company’s common shares.

The Company also has a Deferred Common Share Unit (DSU) Plan for senior management and Directors. A DSU is a unit equivalent in value to a common share. Following the participant’s termination of employment with the Company, the participant will be paid in cash the market value of the common shares represented by the DSUs. In addition, holders are credited with additional units as and when dividends are paid on the Company’s common shares.

As at December 31, 2017, the total liability outstanding related to these plans was $5 million (December 31, 2016 – $4 million), of which $3 million (December 31, 2016 – $3 million) is recorded in other liabilities and $2 million (December 31, 2016 – $1 million) is recorded in accounts payable and accrued liabilities.

Accumulated Other Comprehensive Loss

(US $ millions)	Dec 31, 2017			Dec 31, 2016
Foreign currency translation loss on investment in foreign operations, net of tax of $(5) (December 31, 2016 – $(3))	$	(138	)	$	(167	)
Net loss on hedge of net investment in foreign operations, net of tax of $3 (December 31, 2016 – $3)	(8		)	(8		)
Actuarial loss on defined benefit pension obligation, net of tax of $9 (December 31, 2016 – $9)	(30		)	(27		)
Accumulated other comprehensive loss, net of tax	$	(176	)	$	(202	)

Amendment to Warrant Indenture

On March 25, 2013, the Company amended certain terms of its Warrant Indenture dated December 24, 2008 by executing a Supplemental Warrant Indenture to include a cashless exercise feature. This feature allowed warrant holders to elect to exercise their warrants on a cashless basis, and receive common shares based on the in-the-money value of their warrants. The warrants expired on December 24, 2013. In 2013, a total of 134.4 million warrants were exercised on a cashless basis resulting in the issuance of 8.4 million common shares. As required under IFRS, for the year ended December 31, 2013, the cashless exercise of the warrants resulted in:

• an increase in share capital of $298 million, representing the fair value on the date of exercise of the common shares issued in exchange for the in-the-money value of the warrants;

• a decrease in contributed surplus of $35 million, representing the book value of the warrants recorded at the time of their issuance; and

• a decrease in retained earnings of $263 million, reflecting the difference between these two amounts.

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EARNINGS PER COMMON SHARE

12 Months Ended

Dec. 31, 2017

Earnings per share [abstract]

EARNINGS PER COMMON SHARE

EARNINGS PER COMMON SHARE

(US $ millions, except share and per share information, unless otherwise noted)	2017		2016
Earnings available to common shareholders	$	436	$	183
Common shares (millions):
Weighted average number of common shares outstanding	86.2		85.6
Dilutive stock options(1)	0.4		0.5
Diluted number of common shares	86.6		86.1
Earnings per common share:
Basic	$	5.06	$	2.14
Diluted	5.03		2.13

⁽¹⁾Applicable if dilutive and when the weighted average daily closing share price for the year was greater than the exercise price for stock options. At year-end, there were 0.1 million stock options (December 31, 2016 – 0.5 million) that were not taken into account in the calculation of diluted earnings per share because their effect was anti-dilutive.

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SUPPLEMENTAL CASH FLOW INFORMATION

12 Months Ended

Dec. 31, 2017

Cash Flow Statement [Abstract]

SUPPLEMENTAL CASH FLOW INFORMATION

SUPPLEMENTAL CASH FLOW INFORMATION

Other items comprise:

(US $ millions)	Note	2017			2016
Stock-based compensation		$	4		$	2
Pension funding greater than expense		(3		)	(3		)
Cash interest paid greater than interest expense		(6		)	—
Amortization of debt issue costs	12	2			2
Unrealized (gain) loss on outstanding forwards	18	(1		)	1
Unrealized foreign exchange gain on translation of monetary balances		(4		)	(1		)
Unrealized foreign exchange gain on translation of tax balances		(1		)	—
Other		1			(3		)
		$	(8	)	$	(2	)

The net change in non-cash operating working capital balance comprises:

(US $ millions)	2017			2016
Cash (used for) provided by:
Accounts receivable	$	(33	)	$	(20	)
Prepaids	(1		)	—
Inventory	(37		)	(10		)
Accounts payable and accrued liabilities	53			25
	$	(18	)	$	(5	)
Cash interest and income taxes comprise:
(US $ millions)	2017			2016
Cash income taxes paid, net	$	2		$	2

The net change in financial liabilities comprises:

(US $ millions)	2017			2016
Long-term debt	$	(198	)	$	—
Other long-term debt	—			(30		)
Accrued interest on long-term debt	(6		)	2
Net decrease in financial liabilities	$	(204	)	$	(28	)

Cash and non-cash movements in financial liabilities comprise:

(US $ millions)	2017			2016
Cash movements:
Repayment of debt	$	(200	)	$	—
Interest paid	(42		)	(50		)
A/R securitization repayments	—			(30		)
	(242		)	(80		)
Non-cash movements:
Amortization of debt issue costs	2			2
Interest expense	36			50
	38			52
Net decrease in financial liabilities	$	(204	)	$	(28	)

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CAPITAL MANAGEMENT

12 Months Ended

Dec. 31, 2017

Corporate Information And Statement Of IFRS Compliance [Abstract]

CAPITAL MANAGEMENT

CAPITAL MANAGEMENT

The capital of the Company consists of the components of equity and debt obligations. Norbord monitors its capital structure using two key measures of its relative debt position. While the Company considers both book and market basis metrics, it believes the market basis to be superior to the book basis in measuring the true strength and flexibility of its balance sheet. The two key measures used are defined as follows:

Net debt to capitalization, book basis, is net debt divided by the sum of net debt and tangible net worth. Net debt consists of the principal value of long-term debt, including the current portion and bank advances (if any) less cash and cash equivalents. Consistent with the treatment under the Company’s financial covenants, letters of credit are included in net debt. Tangible net worth consists of shareholders’ equity, less certain adjustments.

Net debt to capitalization, market basis, is net debt divided by the sum of net debt and market capitalization. Net debt is calculated, as outlined above, under net debt to capitalization, book basis. Market capitalization is the number of common shares outstanding at year-end multiplied by the trailing 12-month average per share market price. Market basis capitalization is intended to correct for the low historical book value of Norbord’s asset base relative to its fair value.

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FINANCIAL INSTRUMENTS

12 Months Ended

Dec. 31, 2017

Financial Instruments [Abstract]

FINANCIAL INSTRUMENTS

FINANCIAL INSTRUMENTS

Norbord has exposure to market, commodity price, interest rate, currency, counterparty credit and liquidity risks. Norbord’s primary risk management objective is to protect the Company’s balance sheet, earnings and cash flow.

Norbord’s financial risk management activities are governed by Board-approved financial policies that cover risk identification, tolerance, measurement, hedging limits, hedging products, authorization levels and reporting. Derivative contracts that are deemed to be highly effective in offsetting changes in the fair value, net investment or cash flows of hedged items are designated as hedges of specific exposures. Gains and losses on these instruments are recognized in the same manner as the item being hedged. Hedge ineffectiveness, if any, is measured and included in current period earnings.

Market Risk

Norbord purchases commodity inputs, issues debt at fixed and floating interest rates, invests surplus cash, sells product, purchases inputs in foreign currencies and invests in foreign operations. These activities expose the Company to market risk from changes in commodity prices, interest rates and foreign exchange rates, which affects the Company’s balance sheet, earnings and cash flows. The Company periodically uses derivatives as part of its overall financial risk management policy to manage certain exposures to market risk that result from these activities.

Commodity Price Risk

Norbord is exposed to commodity price risk on most of its manufacturing inputs, which principally comprise wood fibre, resin and energy. These manufacturing inputs are purchased primarily on the open market in competition with other users of such resources, and prices are influenced by factors beyond Norbord’s control.

Norbord monitors market developments in all commodity prices to which it is materially exposed. No liquid futures markets exist for the majority of Norbord’s commodity inputs, but, where possible, Norbord will hedge a portion of its commodity price exposure up to Board-approved limits in order to reduce the potential negative impact of rising commodity input prices. Should Norbord decide to hedge any of this exposure, it will lock in prices directly with its suppliers or, if unfeasible, purchase financial hedges where liquid markets exist.

At December 31, 2017, Norbord has economically hedged approximately 6% of its 2018 expected natural gas consumption by locking in the price directly with its suppliers. Approximately 62% of Norbord’s forecasted electricity consumption is purchased in regulated markets, and Norbord has hedged approximately 43% of its 2018 deregulated electricity consumption. While these contracts are derivatives, they are exempt from being accounted for as financial instruments as they are considered normal purchases for the purpose of consumption.

Interest Rate Risk

Norbord’s financing strategy is to access public and private capital markets to raise long-term core financing, and to utilize the banking market to provide committed standby credit facilities supporting its short-term cash flow needs. The Company has fixed-rate debt, which subjects it to interest rate price risk, and has floating-rate debt, which subjects it to interest rate cash flow risk. In addition, the Company invests surplus cash in bank deposits and short-term money market securities.

Currency Risk

Norbord’s primary foreign exchange exposure arises from the following sources:

• net investments in foreign operations, limited to Norbord's investment in its European operations which transact in both Pounds Sterling and Euros;

• Canadian dollar-denominated monetary assets and liabilities; and

• committed or anticipated foreign currency-denominated transactions, primarily Canadian dollar costs in Norbord's Canadian operations and Euro revenues in Norbord's UK operations.

Under the Company’s risk management policy, the Company may hedge up to 100% of its significant balance sheet foreign exchange exposures by entering into cross-currency swaps and forward foreign exchange contracts. The Company may also hedge a portion of future foreign currency-denominated cash flows, using forward foreign exchange contracts or options for periods of up to three years, in order to reduce the potential negative effect of a strengthening Canadian dollar versus the US dollar, or a weakening Euro versus the Pound Sterling.

Counterparty Credit Risk

Norbord invests surplus cash in bank deposits and short-term money market securities, sells its product to customers on standard market credit terms and uses derivatives to manage its market risk exposures. These activities expose the Company to counterparty credit risk that would result if the counterparty failed to meet its obligations in accordance with the terms and conditions of its contracts with the Company.

Norbord operates in a cyclical commodity business. Accounts receivable credit risk is mitigated through established credit management techniques, including conducting financial and other assessments to establish and monitor a customer’s creditworthiness, setting customer limits, monitoring exposures against these limits and, in some instances, purchasing credit insurance or obtaining trade letters of credit. At year-end, the key performance metrics on the Company’s accounts receivable are in line with prior years. As at December 31, 2017, the provision for doubtful accounts was less than $1 million (December 31, 2016 – less than $1 million). In 2017, Norbord had one customer whose purchases represented greater than 10% of total sales.

Under an accounts receivable securitization program (note 3), Norbord has transferred substantially all of its present and future trade accounts receivable to a third-party trust, sponsored by a highly rated Canadian financial institution, on a fully serviced basis, for proceeds consisting of cash and deferred purchase price. At December 31, 2017, Norbord had no drawings (December 31, 2016 – no drawings) relating to this program. The fair value of the deferred purchase price approximates its carrying value as a result of the short accounts receivable collection cycle and negligible historical credit losses.

Surplus cash is only invested with counterparties meeting minimum credit quality requirements and issuer and concentration limits. Derivative transactions are executed only with approved high-quality counterparties under master netting agreements. The Company monitors and manages its concentration of counterparty credit risk on an ongoing basis.

The Company’s maximum counterparty credit exposure at year-end consisted of the carrying amount of cash and cash equivalents and accounts receivable, which approximate fair value, and the fair value of derivative financial assets.

Liquidity Risk

Norbord strives to maintain sufficient financial liquidity at all times in order to participate in investment opportunities as they arise, as well as to withstand sudden adverse changes in economic circumstances. Management forecasts cash flows for its current and subsequent fiscal years in order to identify financing requirements. These requirements are then addressed through a combination of committed credit facilities and access to capital markets.

At December 31, 2017, Norbord had $241 million in cash and cash equivalents, $125 million undrawn under its accounts receivable securitization program and $226 million in unutilized committed revolving bank lines.

Financial Liabilities

The following table summarizes the aggregate amount of contractual future cash outflows for the Company’s financial liabilities:

											Payments Due by Year
(US $ millions)	2018		2019		2020		2021		2022		Thereafter		Total
Principal	$	—	$	—	$	240	$	—	$	—	$	315	$	555
Interest	33		33		33		19		19		10		147
Long-term debt, including interest	$	33	$	33	$	273	$	19	$	19	$	325	$	702

Note: The above table does not include pension and post-employment benefit plan obligations.

Non-Derivative Financial Instruments

The net book values and fair values of non-derivative financial instruments were as follows:

		Dec 31, 2017				Dec 31, 2016
(US $ millions)	Financial Instrument Category	Net Book Value		Fair Value		Net Book Value		Fair Value
Financial assets:
Cash and cash equivalents	Fair value through profit or loss	$	241	$	241	$	161	$	161
Accounts receivable	Loans and receivables	174		174		141		141
Other assets	Loans and receivables	2		2		—		—
		$	417	$	417	$	302	$	302
Financial liabilities:
Accounts payable and accrued liabilities	Other financial liabilities	$	282	$	282	$	218	$	218
Long-term debt(1)	Other financial liabilities	555		597		755		777
Other liabilities	Other financial liabilities	29		29		27		27
		$	866	$	908	$	1,000	$	1,022

⁽¹⁾ Principal value of long-term debt excluding debt issue costs of $7 million (2016 – $9 million) (note 8).

Derivative Financial Instruments

Canadian Dollar Monetary Hedge

At December 31, 2017, the Company had foreign currency forward contracts representing a notional amount of C $41 million (December 31, 2016 – C $49 million) in place to sell US dollars and buy Canadian dollars with maturities in January 2018. The fair value of these contracts at year-end is an unrealized gain of $1 million (December 31, 2016 – an unrealized loss of less than $1 million); the carrying value of the derivative instrument is equivalent to the unrealized gain at year-end. In 2017, realized gains on the Company’s matured hedges were $4 million (2016 – less than $1 million). A 1- cent change in the exchange rate would result in a less than $1 million impact.

Euro Cash Flow Hedge

At year-end, the Company had foreign currency options representing a notional amount of €60 million (December 31, 2016 – $nil) in place to buy Pounds Sterling and sell Euros with maturities between January 2018 and December 2018. The fair value of these contracts at year-end is an unrealized gain of less than $1 million (December 31, 2016 – $nil). A 1- cent change in the exchange rate would result in a less than $1 million impact.

Derivative instruments are measured at fair value as determined using valuation techniques under Level 2 of the fair value hierarchy. The fair values of over-the-counter derivative financial instruments are based on broker quotes or observable market rates. Those quotes are tested for reasonableness by discounting expected future cash flows using market interest and exchange rates for a similar instrument at the measurement date. Fair values reflect the credit risk of the instrument for the Company and counterparty when appropriate. Realized and unrealized gains and losses on derivative financial instruments are offset by realized and unrealized losses and gains on the underlying exposures being hedged.

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COMMITMENTS AND CONTINGENCIES

12 Months Ended

Dec. 31, 2017

Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

The Company has provided certain guarantees, commitments and indemnifications, including those related to former businesses. The maximum amounts from many of these items cannot be reasonably estimated at this time. However, in certain circumstances, the Company has recourse against other parties to mitigate the risk of loss. In the normal course of its business activities, the Company is subject to claims and legal actions that may be made against its customers, suppliers and others. While the final outcome with respect to actions outstanding or pending as at period-end cannot be predicted with certainty, the Company believes the resolution will not have a material effect on the Company’s financial position, financial performance, or cash flows.

The Company has entered into various commitments as follows:

	Payments Due by Period
(US $ millions)	Less than 1 Year		1–5 Years		Thereafter		Total
Purchase commitments	$	100	$	97	$	5	$	202
Operating leases	5		10		2		17
Reforestation obligations	2		—		1		3
	$	107	$	107	$	8	$	222

Purchase commitments relate to the purchase of property, plant and equipment and long-term purchase contracts with minimum fixed payment amounts.

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RELATED PARTY TRANSACTIONS

12 Months Ended

Dec. 31, 2017

Related Party [Abstract]

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS

In the normal course of operations, Norbord enters into various transactions with related parties which have been measured at exchange value and recognized in the consolidated financial statements. The following transactions have occurred between Norbord and its related parties during the normal course of business.

Brookfield

As at December 31, 2017, total future costs related to a 1999 asset purchase agreement between the Company and Brookfield, for which Norbord provided an indemnity, are estimated at less than $1 million and are included in other liabilities in the consolidated balance sheets.

Norbord periodically engages the services of Brookfield for various financial, real estate and other business services. In 2017, the fees for services rendered were less than $1 million (2016 – less than $1 million).

On August 2, 2017, Brookfield and the Company entered into an agreement with a syndicate of underwriters to complete a bought deal secondary offering of Norbord’s common shares (the Offering). Under the Offering, the syndicate agreed to purchase 3.6 million common shares from Brookfield at a purchase price of C $42.35 per common share. On August 9, 2017, upon the completion of the Offering, Brookfield owned, directly and indirectly, approximately 49% of Norbord common shares. Norbord did not receive any proceeds from the Offering.

On October 13, 2017, Brookfield completed a distribution (the Distribution) of an aggregate of 7.1 million common shares of Norbord to investors in certain of its funds. Upon completion of the Distribution, Brookfield owned and controlled approximately 40% of Norbord's common shares.

Other

Sales to Asian markets are handled by Interex Forest Products Ltd. (Interex), a cooperative sales company over which Norbord, as a 25% shareholder, has significant influence. In 2017, net sales of $78 million (2016 – $62 million) were made to Interex. At year-end, $3 million (December 31, 2016 – $2 million) due from Interex was included in accounts receivable. At year-end, the investment in Interex was less than $1 million (December 31, 2016 – less than $1 million).

Compensation of Key Management Personnel

The remuneration of Directors and other key management personnel was as follows:

(US $ millions)	2017		2016
Salaries, incentives and short-term benefits	$	4	$	3
Share-based awards	1		1
	$	5	$	4

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GEOGRAPHIC SEGMENTS

12 Months Ended

Dec. 31, 2017

Operating Segments [Abstract]

GEOGRAPHIC SEGMENTS

GEOGRAPHIC SEGMENTS

The Company operates principally in North America and Europe. Sales by geographic segment are determined based on the origin of shipment.

	Note								2017
(US $ millions)		North America		Europe		Unallocated			Total
Sales		$	1,747	$	430	$	—		$	2,177
EBITDA(1)		627		39		(10		)	656
Depreciation and amortization	5, 6	94		13		—			107
Additions to property, plant and equipment	5	142		111		—			253
Property, plant and equipment	5	1,168		253		—			1,421
									2016
(US $ millions)		North America		Europe		Unallocated			Total
Sales		$	1,361	$	405	$	—		$	1,766
EBITDA(1)		363		41		(14		)	390
Depreciation and amortization	5, 6	80		14		—			94
Additions to property, plant and equipment	5	60		41		—			101
Property, plant and equipment	5	1,126		136		—			1,262

⁽¹⁾ EBITDA is a non-IFRS financial measure, which the Company uses to assess segment performance and operating results. The Company defines EBITDA as earnings before finance costs, income tax, depreciation and amortization. Non-IFRS financial measures do not have any standardized meaning prescribed by IFRS and are therefore unlikely to be comparable to similar measures presented by other companies.

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(Notes)

12 Months Ended

Dec. 31, 2017

Asset Exchange Agreement [Abstract]

ASSET EXCHANGE AGREEMENT

ASSET EXCHANGE AGREEMENT

On October 28, 2016, the Company reached an agreement with Louisiana-Pacific Corporation (LP) to exchange OSB mills in the province of Quebec (the Asset Exchange) for no cash consideration. The Asset Exchange closed on November 3, 2016, with the Company swapping ownership of its mill in Val-d’Or for LP’s mill in Chambord. The Asset Exchange resulted in the following net changes to the Company’s 2016 financial results and position:

(US $ millions)	Note	2016
Consolidated Statement of Earnings
Gain on asset exchange		$	16
Income tax expense		(4		)
Gain on asset exchange, net		$	12
Consolidated Balance Sheet
Cash		$	7
Property, plant and equipment	5	11
Other liabilities	9	(2		)
Deferred income tax liabilities		(4		)
Increase in net assets		$	12

As part of the Asset Exchange, the Company received $7 million cash relating to the removal of a restrictive land-use covenant in 2016.

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SIGNIFICANT ACCOUNTING POLICIES (Policies)

12 Months Ended

Dec. 31, 2017

Significant Accounting Policies [Abstract]

Statement of Compliance

Statement of Compliance

These consolidated financial statements have been prepared in accordance with International Financial Reporting Standards (IFRS) as issued by the International Accounting Standards Board (IASB) and with Interpretations of the International Financial Reporting Interpretations Committee. These financial statements were authorized for issuance by the Board of Directors of the Company on February 1, 2018.

Basis of Measurement

Basis of Measurement

These consolidated financial statements have been prepared on the historical cost basis except for certain financial instruments, which are measured at fair value (as described in note 18).

Functional and Presentation Currency

Functional and Presentation Currency

The US dollar is the presentation currency of the Company. Each of the Company’s subsidiaries determines its functional currency, and items included in the financial statements of each subsidiary are measured using that functional currency. The functional currency of North American operations is the US dollar and the functional currency of European operations is the Pound Sterling.

Foreign Currency Translation

Foreign Currency Translation

Assets and liabilities of foreign operations having a functional currency other than the US dollar are translated at the rate of exchange prevailing at the reporting date, and revenues and expenses at average rates during the period. Gains or losses on translation are included as a component of shareholders’ equity in other comprehensive income (OCI). Gains or losses on foreign currency-denominated balances and transactions that are designated as hedges of net investments in these operations are reported in the same manner.

Foreign currency-denominated monetary assets and liabilities of the Company and its subsidiaries are translated using the rate of exchange prevailing at the reporting date. Gains or losses on translation of these items are included in earnings and reported as general and administrative expenses, with the exception of gains and losses on translation of foreign currency-denominated deferred tax assets and liabilities, taxes payable and receivable, and investment tax credit receivable. Gains and losses on these items are included in earnings and reported as income tax expense (previously reported as general and administrative expenses). Gains or losses on transactions that hedge these items are also included in earnings. Foreign currency-denominated revenue and expenses are translated at average rates during the period. Foreign currency-denominated non-monetary assets and liabilities, measured at historic cost, are translated at the rate of exchange at the transaction date. Foreign exchange gains or losses arising from intercompany loans to foreign operations, the settlement of which is neither planned nor likely to occur in the foreseeable future and which in substance are considered to form part of the net investment in the foreign operation, are recognized in OCI.

Cash and Cash Equivalents

Cash and Cash Equivalents

Cash and cash equivalents consist of demand deposits, and investment-grade money market securities and bank term deposits with maturities of 90 days or less from the date of purchase. Cash and cash equivalents are recorded at fair value.

Inventories

Inventories

Inventories of finished goods, raw materials and operating and maintenance supplies are valued at the lower of cost and net realizable value, with cost determined on an average cost basis. The cost of finished goods inventories includes direct material, direct labour and an allocation of overhead.

Property, Plant and Equipment

Property, Plant and Equipment

Property, plant and equipment is recorded at cost less accumulated depreciation. Borrowing costs are included as part of the cost of a qualifying asset. Property and plant includes land and buildings. Buildings are depreciated on a straight-line basis over 20 to 40 years. Production equipment is depreciated using the units-of-production method. This method amortizes the cost of equipment over the estimated units to be produced during its estimated useful life, which ranges from 10 to 25 years. When parts of an item of property, plant and equipment have different useful lives, they are accounted for as separate items (major components) of property, plant and equipment. The rates of depreciation are intended to fully depreciate manufacturing and non-manufacturing assets over their useful lives. These periods are assessed at least annually to ensure that they continue to approximate the useful lives of the related assets.

Property, plant and equipment is tested for impairment only when there is an indication of impairment. Impairment testing is a one-step approach for both testing and measurement, with the carrying value of the asset or group of assets compared directly to the higher of fair value less costs of disposal and value in use. Fair value is measured at the sale price of the asset or group of assets in an arm’s length transaction. Value in use is based on the cash flows of the asset or group of assets, discounted to their present value using a pre-tax discount rate that reflects current market assessments of the time value of money and the risks specific to the asset. The projection of future cash flows takes into account the relevant operating plans and management’s best estimate of the most probable set of conditions anticipated to prevail. Where an impairment loss exists, it is recorded against earnings. If an impairment loss subsequently reverses, the carrying amount of the asset is increased to the lesser of the revised estimate of recoverable amount and the carrying value that would have remained had no impairment loss been recognized previously. IFRS requires such reversals to be recognized in earnings if certain criteria are met.

Intangible Assets

Intangible Assets

Intangible assets consist of timber rights and software acquisition and development costs. Intangible assets are recorded at cost less accumulated amortization. Timber rights are amortized in accordance with the substance of the agreements (either on a straight-line basis or based on the volume of timber harvested). Software costs are amortized on a straight-line basis over their estimated useful lives and commence once the software is put into service. Amortization methods, useful lives and residual values are assessed at least annually. If the Company identifies events or changes in circumstances which may indicate that their carrying amount may not be recoverable, the intangible assets would be reviewed for impairment as described in note 2(h) above.

Reforestation Obligations

Reforestation Obligations

For certain operations, timber is harvested under various licences issued by the provinces of British Columbia and Alberta, which include future requirements for reforestation. The fair value of the future estimated reforestation obligation is accrued and recognized in cost of sales on the basis of the volume of timber harvested; fair value is determined by discounting the estimated future cash flows using a credit adjusted risk-free rate. Subsequent changes to fair value resulting from the passage of time and revisions to fair value calculations are recognized in earnings as they occur.

Employee Future Benefits

Employee Future Benefits

Norbord sponsors various defined benefit and defined contribution pension plans, which cover substantially all employees and are funded in accordance with applicable plan and regulatory requirements. The benefits under Norbord’s defined benefit pension plans are generally based on an employee’s length of service and final five years’ or career average salary. The plans do not provide for indexation of benefit payments.

The measurement date for all defined benefit pension plans is December 31. The obligations associated with Norbord’s defined benefit pension plans are actuarially valued using the projected unit credit method, management’s best estimate assumptions for salary escalation, inflation and life expectancy, and a current market discount rate. Assets are measured at fair value. The obligation in excess of plan assets is recorded as a liability and any plans with assets in excess of obligations are recorded as an asset. All actuarial gains or losses are recognized immediately through OCI.

Financial Instruments

Financial Instruments

The Company periodically utilizes derivative financial instruments solely to manage its foreign currency, interest rate and commodity price exposures in the ordinary course of business. Derivatives are not used for trading or speculative purposes. All hedging relationships, risk management objectives and hedging strategies are formally documented and periodically assessed to ensure that the changes in the value of these derivatives are highly effective in offsetting changes in the fair values, net investments or cash flows of the hedged exposures. Accordingly, all gains and losses (realized and unrealized, as applicable) on such derivatives are recognized in the same manner as gains and losses on the underlying exposure being hedged. Any resulting carrying amounts are included in other assets if there is an unrealized gain on the derivative, or in other liabilities if there is an unrealized loss on the derivative.

The fair values of the Company’s derivative financial instruments are determined by using observable market inputs for similar assets and liabilities. These fair values reflect the estimated amount that the Company would have paid or received if required to settle all outstanding contracts at period-end. The fair value measurements of the Company’s derivative financial instruments are classified as Level 2 of a three-level hierarchy, as fair value of these derivative instruments has been determined based on observable market inputs. This fair value represents a point-in-time estimate that may not be relevant in predicting the Company’s future earnings or cash flows.

The Company is exposed to credit risk in the event of non-performance by its derivative counterparties. However, the Company’s Board-approved financial policies require that derivative transactions be executed only with approved highly rated counterparties under master netting agreements; therefore, the Company does not anticipate any non-performance.

The carrying value of the Company’s non-derivative financial instruments approximates fair value, except where disclosed in these notes. Fair values disclosed are determined using actual quoted market prices or, if not available, indicative prices based on similar publicly traded instruments.

Debt Issue Costs

Debt Issue Costs

The Company accounts for transaction costs that are directly attributable to the issuance of long-term debt by deducting such costs from the carrying value of the long-term debt. The capitalized transaction costs are amortized to interest expense over the term of the related long-term debt using the effective interest rate method.

Income Taxes

Income Taxes

The Company uses the asset and liability method of accounting for income taxes and provides for temporary differences between the tax basis and carrying amounts of assets and liabilities. Accordingly, deferred tax assets and liabilities are recognized for all deductible temporary differences, carryforward of unused tax credits and unused tax losses to the extent that it is probable that the deductions, tax credits and tax losses can be utilized. Deferred tax assets and liabilities are measured using enacted or substantively enacted tax rates expected to apply to the year when the asset is realized or the liability is settled, based on the tax rates and laws that have been enacted or substantively enacted at the balance sheet date. In addition, the effect of a change in tax rates on deferred tax assets and liabilities is recognized in earnings in the year of enactment or substantive enactment. Current and deferred income taxes relating to items recognized directly in other comprehensive income are also recognized directly in other comprehensive income. The Company assesses recoverability of deferred tax assets based on the Company’s estimates and assumptions. At the end of each reporting period, the Company reassesses unrecognized deferred tax assets. Previously unrecognized tax assets are recognized to the extent that it has become probable that future taxable profit will support their realization, or derecognized to the extent it is no longer probable that the tax assets will be recovered.

The Company has certain non-monetary assets and liabilities for which the tax reporting currency is different from the functional currency. Translation gains or losses arising on the remeasurement of these items at current exchange rates versus historic exchange rates give rise to a temporary difference for which a deferred tax asset or liability and deferred tax expense (recovery) is recorded.

Share-based Payments

Share-based Payments

The Company issues both equity-settled and cash-settled share-based awards to certain employees, officers and Directors. Both types of awards are accounted for using the fair value method.

Equity-settled share-based awards are issued in the form of stock options that vest evenly over a five-year period. The fair value of the awards on the grant date is determined using a fair value model (Black-Scholes option pricing model). Each tranche of the award is considered to be a separate grant based on its respective vesting period. The fair value of each tranche is determined separately on the date of grant and recognized as compensation expense, net of forfeiture estimate, over the term of its respective vesting period, with a corresponding increase to contributed surplus. Upon exercise of the award, the issued shares are recorded at the corresponding amount in contributed surplus, plus the cash proceeds received.

Cash-settled share-based awards are issued in the form of restricted stock units (RSUs) and deferred stock units (DSUs). The fair value of the liability for RSUs is determined using the Black-Scholes option pricing model. The liabilities for the DSUs are fair valued using the closing price of the Company’s common shares on the grant date. DSUs are initially measured at fair value at the grant date, and subsequently remeasured to fair value at each reporting date until settlement. The liability related to cash-settled awards is recorded in other liabilities.

Revenue Recognition

Revenue Recognition

Sales are recognized when the risks and rewards of ownership pass to the purchaser. This is generally when goods are shipped. Sales are recorded net of discounts.

Sales are governed by contract or by standard industry terms. Revenue is not recognized prior to the completion of those terms. The majority of product is shipped via third-party transport on a freight-on-board shipping point basis. In all cases, product is subject to quality testing by the Company to ensure it meets applicable standards prior to shipment.

Government Grants

Government Grants

Government grants relating to the acquisition of property, plant and equipment are recorded as a reduction of the cost of the asset to which it relates, with any depreciation calculated on the net amount over the related asset’s useful life. Government grants relating to income or for the reimbursement of costs are recognized in earnings in the period they become receivable and deducted against the costs for which the grants were intended to compensate.

Impairment of Non-Derivative Financial Assets

Impairment of Non-Derivative Financial Assets

Financial assets not classified at fair value through profit or loss are assessed at each reporting date to determine whether there is objective evidence of impairment.

Measurement of Fair Value

Measurements of Fair Value

A number of the Company’s accounting policies and disclosures require the measurement of fair value, for both financial and non-financial assets and liabilities.

The Company has an established framework with respect to the measurement of fair values. If third-party information, such as broker quotes or pricing services, is used to measure fair values, then management assesses the evidence obtained from these sources to support the conclusion that such valuations meet the requirements of IFRS, including the level in the fair value hierarchy at which such valuations should be classified.

When measuring the fair value of an asset or a liability, the Company uses observable market data as far as possible. Fair values are categorized into different levels in a fair value hierarchy based on the inputs used in the valuation technique, as follows:

Level 1	–	unadjusted quoted prices available in active markets for identical assets or liabilities;
Level 2	–	inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly (i.e., as prices) or indirectly (i.e., derived from prices); and
Level 3	–	inputs for the asset or liability that are not based on observable market data (unobservable inputs).

Critical Judgements and Estimates

Critical Judgements and Estimates

The preparation of the consolidated financial statements in conformity with IFRS requires management to make critical judgements, estimates and assumptions that affect: the reported amounts of assets, liabilities, revenues and expenses; disclosure of contingent assets and liabilities at the date of the financial statements; and the reported amounts of revenues and expenses during the period. Actual results could differ materially from those estimates. Such differences in estimates are recognized when realized on a prospective basis.

In making estimates and judgements, management relies on external information and observable conditions where possible, supplemented by internal analysis as required. These estimates and judgements have been applied in a manner consistent with prior periods and there are no known trends, commitments, events or uncertainties that we believe will materially affect the methodology or assumptions utilized in making these estimates and judgements in these financial statements. The significant estimates and judgements used in determining the recorded amount for assets and liabilities in the financial statements include the following:

A.    Judgements

Management’s judgements made in applying accounting policies that have the most significant effect on the amounts recognized in the consolidated financial statements are:

(i)Functional Currency

The Company assesses the relevant factors related to the primary economic environment in which its entities operate to determine their functional currency.

(ii)Income Taxes

In the normal course of operations, judgement is required in assessing tax interpretations, regulations and legislation and in determining the provision for income taxes, deferred tax assets and liabilities. These judgements are subject to various uncertainties concerning the interpretation and application of tax laws in the filing of its tax returns in operating jurisdictions, which could materially affect the Company’s earnings or cash flows. There can be no assurance that the tax authorities will not challenge the Company’s filing positions. To the extent that a recognition or derecognition of a deferred tax asset is required, current period earnings or OCI will be affected.

B.    Estimates

Assumptions and estimation uncertainties that have a significant risk of resulting in a material adjustment in the year ended December 31, 2017 are:

(i) Inventory

The Company estimates the net realizable value of its finished goods and raw materials inventory using estimates regarding future selling prices. The net realizable value of operating and maintenance supplies inventory uses estimates regarding replacement costs.

(ii) Property, Plant and Equipment and Intangible Assets

When indicators of impairment are present and the recoverable amount of property, plant and equipment and intangible assets need to be determined, the Company uses the following critical estimates: the timing of forecasted revenues; future selling prices and margins; future sales volumes; maintenance and other capital expenditures; discount rates; useful lives; and residual values.

(iii) Employee Benefit Plans

The net obligations associated with the defined benefit pension plans are actuarially valued using: the projected unit credit method; management’s best estimates for salary escalation, inflation and life expectancy; and a current market discount rate to match the timing and amount of pension payments.

(iv) Income Taxes

Current income tax assets and liabilities are measured at the amount expected to be paid to tax authorities, net of recoveries, based on the tax rates and laws enacted or substantively enacted at the balance sheet date.

Deferred income tax assets are recognized for all deductible temporary differences and carryforward of unused tax credits and unused tax losses, to the extent that it is probable that the deductions, tax credits and tax losses can be utilized. Deferred income tax assets and liabilities are measured at the tax rates that are expected to apply to the year when the asset is realized or the liability settled, based on the tax rates and laws that have been enacted or substantively enacted at the balance sheet date.

(v) Financial Instruments

The critical assumptions and estimates used in determining the fair value of financial instruments are: equity and commodity prices; future interest rates; the relative creditworthiness of the Company to its counterparties; estimated future cash flows; discount rates; and volatility utilized in option valuations.

Changes in Accounting Policies

Changes in Accounting Policies

(i) Income Taxes

In January 2016, the IASB issued amendments to clarify the requirements for recognizing deferred tax assets on unrealized losses. The amendments clarify the accounting for deferred tax where an asset is measured at fair value and that fair value is below the asset’s tax base. They also clarify certain other aspects of accounting for deferred tax assets. The amendments became effective for the Company on January 1, 2017 and did not have any impact on its financial statements.

(ii) Cash Flow Statement Disclosure

In January 2016, the IASB issued an amendment to IAS 7, Statement of Cash Flows, introducing additional disclosure requirements for liabilities arising from financing activities. The amendments became effective for the Company on January 1, 2017 and the additional disclosure has been included in the supplemental cash flow information (note 16) accordingly.

(iii) Foreign Currency Translation

Effective April 2, 2017, the Company changed its policy on the classification of gains and losses on translation of foreign currency-denominated deferred tax assets and liabilities, taxes payable and receivable, and investment tax credit receivable. Gains and losses on these items are included in earnings and reported as income tax expense (previously reported as general and administrative expenses). The effect of this classification change on prior period comparative balances was $1 million and the balances were not required to be restated.

Future Changes in Accounting Policies

Future Changes in Accounting Policies

(i)Financial Instruments

In July 2014, the IASB issued the final publication of IFRS 9, Financial Instruments (IFRS 9), superseding IAS 39, Financial Instruments. IFRS 9 includes amended guidance for the classification and measurement of financial assets by introducing a fair value through other comprehensive income category for certain debt instruments. It also includes a new general hedge accounting standard which will align hedge accounting more closely with risk management and contains a new impairment model which could result in earlier recognition of losses. Norbord intends to adopt IFRS 9 in its financial statements for the annual period beginning on January 1, 2018. Norbord has assessed its financial instruments and does not expect the standard to have a material impact on its financial statements or accounting policy.

(ii)Revenue from Contracts with Customers

In May 2014, the IASB issued IFRS 15, Revenue from Contracts with Customers (IFRS 15), which replaces the existing revenue recognition guidance with a new framework to determine the timing of revenue recognition and the measurement of revenue. In September 2015, the IASB formalized a one-year deferral of the effective date to the year beginning on or after January 1, 2018. In April 2016, the IASB issued an amendment clarifying the guidance on identifying performance obligations, licences of intellectual property, and principal versus agent, and to provide additional practical expedients upon transition. Norbord intends to adopt IFRS 15 and the clarifications in its financial statements for the annual period beginning on January 1, 2018. Norbord has undertaken a comprehensive review of its significant contracts in accordance with the five-step model in IFRS 15 to determine the impact on the timing and measurement of its revenue recognition. Based on this review, Norbord does not expect the standard to have a material impact on its financial statements or accounting policy.

(iii)Share-based Payment

In June 2016, the IASB issued an amendment to IFRS 2, Share-based Payment, clarifying the accounting for certain types of share-based payment transactions. The amendments provide requirements on accounting for the effects of vesting and non-vesting conditions of cash-settled share-based payments, withholding tax obligations for share-based payments with a net settlement feature, and when a modification to the terms of a share-based payment changes the classification of the transaction from cash-settled to equity-settled. Norbord intends to adopt the amendments to IFRS 2 in its financial statements for the annual period beginning on January 1, 2018. Norbord has assessed its share-based payment transactions and does not expect the amendments to have a material impact on its financial statements or accounting policy.

(iv)Foreign Currency Transactions and Advance Consideration

In December 2016, the IFRS Interpretations Committee of the IASB issued IFRIC 22, Foreign Currency Transactions and Advance Consideration (IFRIC 22). The interpretation addresses how to determine the date of the transaction when applying IAS 21, The Effects of Changes in Foreign Exchange Rates. The date of transaction determines the exchange rate to be used on initial recognition of the related asset, expense or income. Norbord intends to adopt IFRIC 22 in its financial statements for the annual period beginning on January 1, 2018. Norbord has assessed its foreign currency transactions and does not expect the interpretation to have a material impact on its financial statements or accounting policy.

(v)Leases

In January 2016, the IASB issued IFRS 16, Leases (IFRS 16), which replaces the existing lease accounting guidance. IFRS 16 requires all leases to be reported on the balance sheet unless certain criteria for exclusion are met. Norbord intends to adopt IFRS 16 in its financial statements for the annual period beginning on January 1, 2019. The Company is currently assessing the impact of IFRS 16 on its financial statements.

(vi) Uncertainty over Income Tax Treatments

In June 2017, the IFRS Interpretations Committee of the IASB issued IFRIC 23, Uncertainty over Income Tax Treatments (IFRIC 23). The interpretation provides guidance on the accounting for current and deferred tax liabilities and assets in circumstances in which there is uncertainty over income tax treatments. The interpretation is effective for the annual period beginning on January 1, 2019. The Company is currently assessing the impact of IFRIC 23 on its financial statements.

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INVENTORY (Tables)

12 Months Ended

Dec. 31, 2017

Inventories [Abstract]

Disclosure of inventory

(US $ millions)	Dec 31, 2017		Dec 31, 2016
Raw materials	$	68	$	55
Finished goods	74		61
Operating and maintenance supplies	82		69
	$	224	$	185

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PROPERTY, PLANT AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2017

Property, plant and equipment [abstract]

Disclosure of detailed information about property, plant and equipment

(US $ millions)	Note	Land			Buildings			Production Equipment			Construction in Progress			Total
Cost
December 31, 2015		$	12		$	300		$	1,276		$	95		$	1,683
Additions(1)		—			—			—			101			101
Net change from asset exchange	22	1			5			4			—			10
Disposals		—			—			(3		)	—			(3		)
Transfers		—			8			49			(57		)	—
Effect of foreign exchange		(1		)	(2		)	(43		)	(3		)	(49		)
December 31, 2016		12			311			1,283			136			1,742
Additions(1)		—			—			1			252			253
Disposals		—			(2		)	(16		)	—			(18		)
Transfers		—			31			268			(299		)	—
Effect of foreign exchange		—			3			13			9			25
December 31, 2017		$	12		$	343		$	1,549		$	98		$	2,002
Accumulated depreciation
December 31, 2015		$	—		$	85		$	338		$	—		$	423
Depreciation		—			16			76			—			92
Disposals		—			—			(3		)	—			(3		)
Net change from asset exchange	22	—			(1		)	—			—			(1		)
Effect of foreign exchange		—			—			(31		)	—			(31		)
December 31, 2016		—			100			380			—			480
Depreciation		—			17			88			—			105
Disposals		—			—			(10		)	—			(10		)
Effect of foreign exchange		—			1			5			—			6
December 31, 2017		$	—		$	118		$	463		$	—		$	581
Net
December 31, 2016		$	12		$	211		$	903		$	136		$	1,262
December 31, 2017		12			225			1,086			98			1,421

⁽¹⁾ Net of government grants of $13 million (2016 – $3 million) received or receivable related to the Inverness expansion project.

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INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2017

Intangible Assets [Abstract]

Disclosure of detailed information about intangible assets

(US $ millions)	Cost			Accumulated  Amortization			Net Book Value
December 31, 2015	$	34		$	16		$	18
Additions	6			2			4
Disposals	(1		)	(1		)	—
December 31, 2016	39			17			22
Additions	4			2			2
Effect of foreign exchange	1			1			—
December 31, 2017	$	44		$	20		$	24

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OTHER ASSETS (Tables)

12 Months Ended

Dec. 31, 2017

Subclassifications of assets, liabilities and equities [abstract]

Disclosure of other assets

(US $ millions)	Note	Dec 31, 2017		Dec 31, 2016
Defined benefit pension asset	10	$	2	$	—
Foreign currency forward contracts	18	1		—
Investment tax credit receivable		—		13
Other		—		1
		$	3	$	14

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LONG-TERM DEBT (Tables)

12 Months Ended

Dec. 31, 2017

Financial Instruments [Abstract]

Disclosure of detailed information about borrowings

(US $ millions)	Dec 31, 2017			Dec 31, 2016
Principal value
7.7% senior secured notes due February 2017	$	—		$	200
5.375% senior secured notes due December 2020	240			240
6.25% senior secured notes due April 2023	315			315
	555			755
Less: Unamortized debt issue costs	(7		)	(9		)
Less: Current portion	—			(200		)
	$	548		$	546

Maturities of long-term debt are as follows:

(US $ millions)	2018		2019		2020		2021		2022		Thereafter		Total
Maturities of long-term debt	$	—	$	—	$	240	$	—	$	—	$	315	$	555

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OTHER LIABILITIES (Tables)

12 Months Ended

Dec. 31, 2017

Subclassifications of assets, liabilities and equities [abstract]

Disclosure of other liabilities

(US $ millions)	Note	Dec 31, 2017		Dec 31, 2016
Defined benefit pension obligation	10	$	20	$	18
Accrued employee benefits	14	6		5
Reforestation obligation		2		2
Other		1		2
		$	29	$	27

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EMPLOYEE BENEFIT PLANS (Tables)

12 Months Ended

Dec. 31, 2017

Employee Benefits [Abstract]

Disclosure of defined benefit obligation and assets

Information about Norbord’s defined benefit pension obligations and assets is as follows:

(US $ millions)	Note	2017			2016
Change in accrued benefit obligation during the year
Accrued benefit obligation, beginning of year		$	152		$	140
Current service cost		3			3
Interest on accrued benefit obligation		6			6
Benefits paid		(12		)	(9		)
Net actuarial loss arising from changes to:
Financial assumptions		7			5
Increase arising from the asset exchange	22	—			6
Foreign currency exchange rate impact		11			1
Accrued benefit obligation, end of year(1)		$	167		$	152
Change in plan assets during the year
Plan assets, beginning of year		$	134		$	117
Interest income		5			5
Remeasurement gains:
Return on plan assets (excluding interest income)		5			10
Employer contributions		7			7
Benefits paid		(12		)	(9		)
Increase arising from the asset exchange	22	—			4
Foreign currency exchange rate impact		10			—
Plan assets, end of year(1)		$	149		$	134
Funded status
Accrued benefit obligation		$	167		$	152
Plan assets		(149		)	(134		)
Accrued benefit obligation in excess of plan assets(1)		$	18		$	18

⁽¹⁾ All plans have accrued benefit obligations in excess of plan assets with the exception of the UK plan, which has been presented as other assets.

The components of benefit expense recognized in the statement of earnings are as follows:

(US $ millions)	2017		2016
Current service cost	$	3	$	3
Interest cost	1		1
Net periodic pension expense	$	4	$	4

Disclosure of significant actuarial assumptions

The significant weighted average actuarial assumptions are as follows:

	2017		2016
Used in calculation of accrued benefit obligation, end of year
Discount rate	3.4	%	3.7	%
Rate of compensation increase	2.9	%	2.8	%
Used in calculation of net periodic pension expense for the year
Discount rate	3.7	%	3.9	%
Rate of compensation increase	2.9	%	2.8	%

Disclosure of change to significant actuarial assumptions

The impact of a change to the significant actuarial assumptions on the accrued benefit obligation as at December 31, 2017 is as follows:

(US $ millions)	Increase			Decrease
Discount rate (0.5% change)	$	(13	)	$	14
Compensation rate (1.0% change)	3			(3		)
Future life expectancy (1 year movement)	4			(4		)
Retirement age (1 year movement)	(2		)	—

Disclosure of weighted average asset allocation

The weighted average asset allocation of Norbord’s defined benefit pension plan assets is as follows:

	Dec 31, 2017		Dec 31, 2016
Asset category
Equity investments	55	%	57	%
Fixed income investments	45	%	40	%
Cash	—	%	3	%
Total assets	100	%	100	%

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EMPLOYEE COMPENSATION AND BENEFITS (Tables)

12 Months Ended

Dec. 31, 2017

Analysis of income and expense [abstract]

Disclosure of detailed employee compensation and benefits expense

Included in cost of sales and general and administrative expenses are the following:

(US $ millions)	2017		2016
Short-term employee compensation and benefits	$	203	$	178
Long-term employee compensation and benefits	32		30
Share-based payments	2		2
	$	237	$	210

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FINANCE COSTS (Tables)

12 Months Ended

Dec. 31, 2017

Analysis of income and expense [abstract]

Disclosure of finance costs

The components of finance costs were as follows:

(US $ millions)	2017		2016
Interest on long-term debt(1)	$	27	$	47
Interest on other long-term debt	1		1
Amortization of debt issue costs	2		2
Revolving bank lines fees and other	1		1
	31		51
Net interest expense on net pension obligation	1		1
Total finance costs	$	32	$	52

⁽¹⁾ Net of capitalized interest of $7 million and $1 million, respectively (note 5).

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INCOME TAX (Tables)

12 Months Ended

Dec. 31, 2017

Income Taxes [Abstract]

Disclosure of deferred income tax balances, unused tax losses, and other deductible temporary differences

In addition, the Company has not recognized the following tax attributes with the expiry date, if applicable:

(US $ millions)
United States – State tax loss (2021–2037)(1)	$	303
United States – State tax credits (2019–2026)	60

⁽¹⁾ Aggregate loss from the states where Norbord's mills are located, excluding Texas.

The source of deferred income tax balances is as follows:

(US $ millions)	Dec 31, 2017			Dec 31, 2016
Property, plant and equipment, differences in basis	$	(200	)	$	(248	)
Benefit of tax loss carryforwards	38			87
Other temporary differences in basis	15			8
Net deferred income tax liabilities	$	(147	)	$	(153	)

(US $ millions)	Dec 31, 2017			Dec 31, 2016
Deferred income tax assets	$	4		$	4
Deferred income tax liabilities	(151		)	(157		)
Net deferred income tax liabilities	$	(147	)	$	(153	)

As at December 31, 2017, the Company had the following approximate unused tax losses available to carry forward:

	Amount (millions)		Latest Expiry Year
Tax loss carryforwards
United States		US $149	2037
Canada – capital loss		C $126	Indefinite
Canada – non-capital loss		C $22	2037
Belgium		€32	Indefinite
United Kingdom		£1	Indefinite

Disclosure of major components of tax expense (income)

Income tax expense recognized in the statement of earnings comprises the following:

(US $ millions)	2017			2016
Current income tax expense	$	90		$	4
Deferred income tax (recovery) expense	(9		)	57
Income tax expense	$	81		$	61

As a result of the USTax Reform bill enacted in December 2017, the Company recognized a net income tax recovery of $35 million due to the impact of the US federal tax rate reduction from 35% to 21% on the remeasurement of deferred tax assets and liabilities. The income tax expense is calculated as follows:

(US $ millions)	2017			2016
Earnings before income tax	$	517		$	244
Income tax expense at combined Canadian federal and provincial statutory rate of 27% (2016 – 27%)	140			66
Effect of:
Change in tax rates and new legislation	(35		)	—
Rate differences on foreign activities	(12		)	(7		)
Recognition of the benefit of prior years’ tax losses and other deferred tax assets	(14		)	(2		)
Non-recognition of deferred tax assets relating to foreign exchange gain	1			2
Current income tax expense not previously recognized	—			2
Other	1			—
Income tax expense	$	81		$	61
Income tax (expense) recovery recognized in the statement of comprehensive income comprises the following:
(US $ millions)	2017			2016
Actuarial (loss) gain on post-employment obligation	$	(3	)	$	5
Tax	—			—
Net of tax	$	(3	)	$	5
Foreign currency translation gain (loss) on foreign operations	$	31		$	(44	)
Tax	(2		)	7
Net of tax	$	29		$	(37	)

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SHAREHOLDERS' EQUITY (Tables)

12 Months Ended

Dec. 31, 2017

Share Capital, Reserves, And Other Equity Interest [Abstract]

Disclosure of classes of share capital

	2017			2016
	Shares (millions)	Amount (US $ millions)		Shares (millions)	Amount (US $ millions)
Common shares outstanding, beginning of year	85.8	$	1,341	85.4	$	1,334
Issuance of common shares upon exercise of options and Dividend Reinvestment Plan	0.6	9		0.4	7
Common shares outstanding, end of year	86.4	$	1,350	85.8	$	1,341

Disclosure of number and weighted average exercise prices of share options

	2017				2016
	Options (millions)		Weighted Average Exercise Price (C $)		Options (millions)		Weighted Average Exercise Price (C $)
Balance, beginning of year	1.8		$	25.28	2.3		$	24.79
Options granted	0.2		34.96		—		—
Options exercised	(0.6	)	15.16		(0.4	)	14.93
Options expired	—		—		(0.1	)	111.30
Balance, end of year	1.4		$	27.23	1.8		$	25.28
Exercisable at year-end	0.8		$	25.03	1.2		$	25.18

Disclosure of significant assumptions used to estimate fair value of options granted

The table below outlines the significant assumptions used during the period to estimate the fair value of options granted:

	2017			2016
Risk-free interest rate	1.1		%	—
Expected volatility	30		%	—
Dividend yield	1.1		%	—
Expected option life (years)	5			—
Share price (in Canadian dollars)		$37.72		—
Exercise price (in Canadian dollars)		$34.96		—
Weighted average fair value per option granted (in Canadian dollars)		$ 7.47		—

Disclosure of range of exercise prices of outstanding share options

The following table summarizes the weighted average exercise prices and the weighted average remaining contractual life of the stock options outstanding at December 31, 2017:

		Options Outstanding			Options Exercisable
Range of Exercise Prices (C $)	Options	Weighted Average Remaining Contractual Life (years)	Weighted Average Exercise Price (C $)		Options	Weighted Average Exercise Price (C $)
$6.50–$10.00	157,000	4.08	$	9.96	157,000	$	9.96
$10.01–$15.00	129,862	2.98	14.58		129,862	14.58
$15.01–$20.00	108,210	2.22	18.04		108,210	18.04
$20.01–$25.00	11,409	6.45	21.44		11,409	21.44
$25.01–$30.00	457,420	7.42	27.25		172,420	27.32
$30.01–$35.00	458,696	7.16	32.35		158,702	30.53
$60.90	90,630	0.10	60.90		90,630	60.90
	1,413,227	6.00	$	27.23	828,233	$	25.03

Disclosure of number and weighted average remaining contractual life of outstanding share options

The following table summarizes the weighted average exercise prices and the weighted average remaining contractual life of the stock options outstanding at December 31, 2017:

		Options Outstanding			Options Exercisable
Range of Exercise Prices (C $)	Options	Weighted Average Remaining Contractual Life (years)	Weighted Average Exercise Price (C $)		Options	Weighted Average Exercise Price (C $)
$6.50–$10.00	157,000	4.08	$	9.96	157,000	$	9.96
$10.01–$15.00	129,862	2.98	14.58		129,862	14.58
$15.01–$20.00	108,210	2.22	18.04		108,210	18.04
$20.01–$25.00	11,409	6.45	21.44		11,409	21.44
$25.01–$30.00	457,420	7.42	27.25		172,420	27.32
$30.01–$35.00	458,696	7.16	32.35		158,702	30.53
$60.90	90,630	0.10	60.90		90,630	60.90
	1,413,227	6.00	$	27.23	828,233	$	25.03

Disclosure of accumulated other comprehensive income (loss)

(US $ millions)	Dec 31, 2017			Dec 31, 2016
Foreign currency translation loss on investment in foreign operations, net of tax of $(5) (December 31, 2016 – $(3))	$	(138	)	$	(167	)
Net loss on hedge of net investment in foreign operations, net of tax of $3 (December 31, 2016 – $3)	(8		)	(8		)
Actuarial loss on defined benefit pension obligation, net of tax of $9 (December 31, 2016 – $9)	(30		)	(27		)
Accumulated other comprehensive loss, net of tax	$	(176	)	$	(202	)

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EARNINGS PER COMMON SHARE (Tables)

12 Months Ended

Dec. 31, 2017

Earnings per share [abstract]

Disclosure of earnings per share

(US $ millions, except share and per share information, unless otherwise noted)	2017		2016
Earnings available to common shareholders	$	436	$	183
Common shares (millions):
Weighted average number of common shares outstanding	86.2		85.6
Dilutive stock options(1)	0.4		0.5
Diluted number of common shares	86.6		86.1
Earnings per common share:
Basic	$	5.06	$	2.14
Diluted	5.03		2.13

⁽¹⁾Applicable if dilutive and when the weighted average daily closing share price for the year was greater than the exercise price for stock options. At year-end, there were 0.1 million stock options (December 31, 2016 – 0.5 million) that were not taken into account in the calculation of diluted earnings per share because their effect was anti-dilutive.

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SUPPLEMENTAL CASH FLOW INFORMATION (Tables)

12 Months Ended

Dec. 31, 2017

Cash Flow Statement [Abstract]

Disclosure of supplemental cash flow statement items

Other items comprise:

(US $ millions)	Note	2017			2016
Stock-based compensation		$	4		$	2
Pension funding greater than expense		(3		)	(3		)
Cash interest paid greater than interest expense		(6		)	—
Amortization of debt issue costs	12	2			2
Unrealized (gain) loss on outstanding forwards	18	(1		)	1
Unrealized foreign exchange gain on translation of monetary balances		(4		)	(1		)
Unrealized foreign exchange gain on translation of tax balances		(1		)	—
Other		1			(3		)
		$	(8	)	$	(2	)

The net change in non-cash operating working capital balance comprises:

(US $ millions)	2017			2016
Cash (used for) provided by:
Accounts receivable	$	(33	)	$	(20	)
Prepaids	(1		)	—
Inventory	(37		)	(10		)
Accounts payable and accrued liabilities	53			25
	$	(18	)	$	(5	)
Cash interest and income taxes comprise:
(US $ millions)	2017			2016
Cash income taxes paid, net	$	2		$	2

The net change in financial liabilities comprises:

(US $ millions)	2017			2016
Long-term debt	$	(198	)	$	—
Other long-term debt	—			(30		)
Accrued interest on long-term debt	(6		)	2
Net decrease in financial liabilities	$	(204	)	$	(28	)

Cash and non-cash movements in financial liabilities comprise:

(US $ millions)	2017			2016
Cash movements:
Repayment of debt	$	(200	)	$	—
Interest paid	(42		)	(50		)
A/R securitization repayments	—			(30		)
	(242		)	(80		)
Non-cash movements:
Amortization of debt issue costs	2			2
Interest expense	36			50
	38			52
Net decrease in financial liabilities	$	(204	)	$	(28	)

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FINANCIAL INSTRUMENTS (Tables)

12 Months Ended

Dec. 31, 2017

Financial Instruments [Abstract]

Disclosure of maturity analysis for financial liabilities

The following table summarizes the aggregate amount of contractual future cash outflows for the Company’s financial liabilities:

											Payments Due by Year
(US $ millions)	2018		2019		2020		2021		2022		Thereafter		Total
Principal	$	—	$	—	$	240	$	—	$	—	$	315	$	555
Interest	33		33		33		19		19		10		147
Long-term debt, including interest	$	33	$	33	$	273	$	19	$	19	$	325	$	702

Note: The above table does not include pension and post-employment benefit plan obligations.

Disclosure of net book values and fair values of non-derivative financial assets

The net book values and fair values of non-derivative financial instruments were as follows:

		Dec 31, 2017				Dec 31, 2016
(US $ millions)	Financial Instrument Category	Net Book Value		Fair Value		Net Book Value		Fair Value
Financial assets:
Cash and cash equivalents	Fair value through profit or loss	$	241	$	241	$	161	$	161
Accounts receivable	Loans and receivables	174		174		141		141
Other assets	Loans and receivables	2		2		—		—
		$	417	$	417	$	302	$	302
Financial liabilities:
Accounts payable and accrued liabilities	Other financial liabilities	$	282	$	282	$	218	$	218
Long-term debt(1)	Other financial liabilities	555		597		755		777
Other liabilities	Other financial liabilities	29		29		27		27
		$	866	$	908	$	1,000	$	1,022

⁽¹⁾ Principal value of long-term debt excluding debt issue costs of $7 million (2016 – $9 million) (note 8).

Disclosure of net book values and fair values of non-derivative financial liabilities

The net book values and fair values of non-derivative financial instruments were as follows:

		Dec 31, 2017				Dec 31, 2016
(US $ millions)	Financial Instrument Category	Net Book Value		Fair Value		Net Book Value		Fair Value
Financial assets:
Cash and cash equivalents	Fair value through profit or loss	$	241	$	241	$	161	$	161
Accounts receivable	Loans and receivables	174		174		141		141
Other assets	Loans and receivables	2		2		—		—
		$	417	$	417	$	302	$	302
Financial liabilities:
Accounts payable and accrued liabilities	Other financial liabilities	$	282	$	282	$	218	$	218
Long-term debt(1)	Other financial liabilities	555		597		755		777
Other liabilities	Other financial liabilities	29		29		27		27
		$	866	$	908	$	1,000	$	1,022

⁽¹⁾ Principal value of long-term debt excluding debt issue costs of $7 million (2016 – $9 million) (note 8).

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COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2017

Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]

Disclosure of commitments

The Company has entered into various commitments as follows:

	Payments Due by Period
(US $ millions)	Less than 1 Year		1–5 Years		Thereafter		Total
Purchase commitments	$	100	$	97	$	5	$	202
Operating leases	5		10		2		17
Reforestation obligations	2		—		1		3
	$	107	$	107	$	8	$	222

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RELATED PARTY TRANSACTIONS (Tables)

12 Months Ended

Dec. 31, 2017

Related Party [Abstract]

Disclosure of transactions between related parties

The remuneration of Directors and other key management personnel was as follows:

(US $ millions)	2017		2016
Salaries, incentives and short-term benefits	$	4	$	3
Share-based awards	1		1
	$	5	$	4

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GEOGRAPHIC SEGMENTS (Tables)

12 Months Ended

Dec. 31, 2017

Operating Segments [Abstract]

Disclosure of geographical segments

	Note								2017
(US $ millions)		North America		Europe		Unallocated			Total
Sales		$	1,747	$	430	$	—		$	2,177
EBITDA(1)		627		39		(10		)	656
Depreciation and amortization	5, 6	94		13		—			107
Additions to property, plant and equipment	5	142		111		—			253
Property, plant and equipment	5	1,168		253		—			1,421
									2016
(US $ millions)		North America		Europe		Unallocated			Total
Sales		$	1,361	$	405	$	—		$	1,766
EBITDA(1)		363		41		(14		)	390
Depreciation and amortization	5, 6	80		14		—			94
Additions to property, plant and equipment	5	60		41		—			101
Property, plant and equipment	5	1,126		136		—			1,262

⁽¹⁾ EBITDA is a non-IFRS financial measure, which the Company uses to assess segment performance and operating results. The Company defines EBITDA as earnings before finance costs, income tax, depreciation and amortization. Non-IFRS financial measures do not have any standardized meaning prescribed by IFRS and are therefore unlikely to be comparable to similar measures presented by other companies.

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(Tables)

12 Months Ended

Dec. 31, 2017

Asset Exchange Agreement [Abstract]

Disclosure of financial impact from asset exchange

The Asset Exchange resulted in the following net changes to the Company’s 2016 financial results and position:

(US $ millions)	Note	2016
Consolidated Statement of Earnings
Gain on asset exchange		$	16
Income tax expense		(4		)
Gain on asset exchange, net		$	12
Consolidated Balance Sheet
Cash		$	7
Property, plant and equipment	5	11
Other liabilities	9	(2		)
Deferred income tax liabilities		(4		)
Increase in net assets		$	12

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NATURE AND DESCRIPTION OF THE COMPANY (Details)	12 Months Ended
	Dec. 31, 2017 property
Disclosure of subsidiaries [line items]
Number of plant locations	17
Brookfield | Norbord
Disclosure of subsidiaries [line items]
Proportion of ownership interest in subsidiary	40.00%

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SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Millions		12 Months Ended
	Apr. 02, 2017	Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]
Defined benefit plan, final years of service		5 years
Reclassification of foreign currency gains and losses on translation of income tax balances	$ 1
Employee Stock Option
Disclosure of detailed information about property, plant and equipment [line items]
Vesting period		5 years
Minimum | Buildings
Disclosure of detailed information about property, plant and equipment [line items]
Useful life or depreciation rate of property, plant and equipment		20 years
Minimum | Production Equipment
Disclosure of detailed information about property, plant and equipment [line items]
Useful life or depreciation rate of property, plant and equipment		10 years
Maximum | Buildings
Disclosure of detailed information about property, plant and equipment [line items]
Useful life or depreciation rate of property, plant and equipment		40 years
Maximum | Production Equipment
Disclosure of detailed information about property, plant and equipment [line items]
Useful life or depreciation rate of property, plant and equipment		25 years

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(Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of continuing involvement in derecognised financial assets [line items]
Termination notice of accounts receivable securitization program	12 months
Securitisations
Disclosure of continuing involvement in derecognised financial assets [line items]
Recognised assets representing continuing involvement in derecognised financial assets, program amount	$ 125,000,000
Recognised trade accounts receivable transferred	153,000,000	$ 125,000,000
Recognised other long-term debt relating to financing program	$ 0	$ 0
Minimum
Disclosure of continuing involvement in derecognised financial assets [line items]
Utilisation rate on other long-term debt within securitization program	1.50%
Maximum
Disclosure of continuing involvement in derecognised financial assets [line items]
Utilisation rate on other long-term debt within securitization program	2.60%

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INVENTORY (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Inventories [Abstract]
Raw materials	$ 68	$ 55
Finished goods	74	61
Operating and maintenance supplies	82	69
Inventory	224	185
Inventory provision	14	10
Change in inventory provision	$ 4	$ 0

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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment, beginning balance	$ 1,262
Additions	253	$ 101
Property, plant and equipment, ending balance	1,421	1,262
Interest costs capitalised	(7)	(1)
Cost
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment, beginning balance	1,742	1,683
Additions	253	101
Net change from asset exchange		10
Disposals	18	(3)
Transfers	0	0
Effect of foreign exchange	25	(49)
Property, plant and equipment, ending balance	2,002	1,742
Accumulated depreciation
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment, beginning balance	480	423
Net change from asset exchange		(1)
Depreciation	105	92
Disposals	10	(3)
Effect of foreign exchange	6	(31)
Property, plant and equipment, ending balance	581	480
Land
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment, beginning balance	12
Property, plant and equipment, ending balance	12	12
Land | Cost
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment, beginning balance	12	12
Additions	0	0
Net change from asset exchange		1
Disposals	0	0
Transfers	0	0
Effect of foreign exchange	0	(1)
Property, plant and equipment, ending balance	12	12
Land | Accumulated depreciation
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment, beginning balance	0	0
Net change from asset exchange		0
Depreciation	0	0
Disposals	0	0
Effect of foreign exchange	0	0
Property, plant and equipment, ending balance	0	0
Buildings
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment, beginning balance	211
Property, plant and equipment, ending balance	225	211
Buildings | Cost
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment, beginning balance	311	300
Additions	0	0
Net change from asset exchange		5
Disposals	2	0
Transfers	31	8
Effect of foreign exchange	3	(2)
Property, plant and equipment, ending balance	343	311
Buildings | Accumulated depreciation
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment, beginning balance	100	85
Net change from asset exchange		(1)
Depreciation	17	16
Disposals	0	0
Effect of foreign exchange	1	0
Property, plant and equipment, ending balance	118	100
Production Equipment
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment, beginning balance	903
Property, plant and equipment, ending balance	1,086	903
Production Equipment | Cost
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment, beginning balance	1,283	1,276
Additions	1	0
Net change from asset exchange		4
Disposals	16	(3)
Transfers	268	49
Effect of foreign exchange	13	(43)
Property, plant and equipment, ending balance	1,549	1,283
Production Equipment | Accumulated depreciation
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment, beginning balance	380	338
Net change from asset exchange		0
Depreciation	88	76
Disposals	10	(3)
Effect of foreign exchange	5	(31)
Property, plant and equipment, ending balance	463	380
Construction in Progress
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment, beginning balance	136
Property, plant and equipment, ending balance	98	136
Government grants	13	3
Construction in Progress | Cost
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment, beginning balance	136	95
Additions	252	101
Net change from asset exchange		0
Disposals	0	0
Transfers	(299)	(57)
Effect of foreign exchange	9	(3)
Property, plant and equipment, ending balance	98	136
Construction in Progress | Accumulated depreciation
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment, beginning balance	0	0
Net change from asset exchange		0
Depreciation	0	0
Disposals	0	0
Effect of foreign exchange	0	0
Property, plant and equipment, ending balance	$ 0	$ 0

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INTANGIBLE ASSETS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets, beginning balance	$ 22	$ 18
Additions	2	4
Disposals		0
Effect of foreign exchange	0
Intangible assets, ending balance	24	22
Cost
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets, beginning balance	39	34
Additions	4	6
Disposals		(1)
Effect of foreign exchange	1
Intangible assets, ending balance	44	39
Accumulated Amortization
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets, beginning balance	17	16
Additions	2	2
Disposals		(1)
Effect of foreign exchange	1
Intangible assets, ending balance	$ 20	$ 17

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OTHER ASSETS (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Subclassifications of assets, liabilities and equities [abstract]
Defined benefit pension asset	$ 2	$ 0
Foreign currency forward contracts	1	0
Investment tax credit receivable	0	13
Other	0	1
Other assets	$ 3	$ 14

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LONG-TERM DEBT - Values of Debt (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]
Principal value	$ 555	$ 755
Less: Unamortized debt issue costs	(7)	(9)
Less: Current portion	0	(200)
Long-term debt	$ 548	$ 546
7.7% senior secured notes due February 2017
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate	7.70%	7.70%
Principal value	$ 0	$ 200
5.375% senior secured notes due December 2020
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate	5.375%
Principal value	$ 240	240
6.25% senior secured notes due April 2023
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate	6.25%
Principal value	$ 315	$ 315

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LONG-TERM DEBT - Maturities of Debt (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]
Maturities of long-term debt	$ 555	$ 755
Less than 1 Year
Disclosure of detailed information about borrowings [line items]
Maturities of long-term debt	0
2019
Disclosure of detailed information about borrowings [line items]
Maturities of long-term debt	0
2020
Disclosure of detailed information about borrowings [line items]
Maturities of long-term debt	240
2021
Disclosure of detailed information about borrowings [line items]
Maturities of long-term debt	0
2022
Disclosure of detailed information about borrowings [line items]
Maturities of long-term debt	0
Thereafter
Disclosure of detailed information about borrowings [line items]
Maturities of long-term debt	$ 315

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LONG-TERM DEBT - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]
Amortization of debt issue costs	$ 2,000,000	$ 2,000,000
7.7% senior secured notes due February 2017
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate	7.70%	7.70%
5.375% senior secured notes due December 2020
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate	5.375%
6.25% senior secured notes due April 2023
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate	6.25%
Revolving Bank Line
Disclosure of detailed information about borrowings [line items]
Maximum borrowing capacity	$ 245,000,000
Undrawn borrowing facilities	0
Letters of credit	19,000,000	$ 25,000,000
Unutilized borrowing facilities	226,000,000	$ 220,000,000
Minimum tangible net worth	$ 500,000,000
Maximum net debt to total capitalization	65.00%
Effective Interest Rate
Disclosure of detailed information about borrowings [line items]
Borrowings, interest rate	5.90%	6.40%

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OTHER LIABILITIES (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Subclassifications of assets, liabilities and equities [abstract]
Defined benefit pension obligation	$ 20	$ 18
Accrued employee benefits	6	5
Reforestation obligation	2	2
Other	1	2
Other liabilities	$ 29	$ 27

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EMPLOYEE BENEFIT PLANS - Information about Defined Benefit Obligation and Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of net defined benefit liability (asset) [line items]
Current service cost	$ 3	$ 3
Interest expense (income)	1	1
Funded status
Accrued benefit obligation	167	152
Plan assets	(149)	(134)
Accrued benefit obligation in excess of plan assets(1)	18	18
Change in accrued benefit obligation
Disclosure of net defined benefit liability (asset) [line items]
Net defined benefit liability (asset), beginning balance	152	140
Current service cost	3	3
Interest expense (income)	6	6
Remeasurement gains:
Benefits paid	(12)	(9)
Net actuarial loss arising from changes to:
Financial assumptions	7	5
Increase (decrease) arising from the Asset Exchange (see note 3)	0	6
Foreign currency exchange rate impact, increase (decrease)	11	1
Net defined benefit liability (asset), ending balance	167	152
Change in plan assets
Disclosure of net defined benefit liability (asset) [line items]
Net defined benefit liability (asset), beginning balance	(134)	(117)
Interest expense (income)	(5)	(5)
Remeasurement gains:
Return on plan assets (excluding interest income)	5	10
Employer contributions	7	7
Benefits paid	(12)	(9)
Net actuarial loss arising from changes to:
Increase (decrease) arising from the Asset Exchange (see note 3)	0	(4)
Foreign currency exchange rate impact, increase (decrease)	(10)	0
Net defined benefit liability (asset), ending balance	$ (149)	$ (134)

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EMPLOYEE BENEFIT PLANS - Components of Benefit Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Employee Benefits [Abstract]
Current service cost	$ 3	$ 3
Interest cost	1	1
Net periodic pension expense	$ 4	$ 4

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EMPLOYEE BENEFIT PLANS - Actuarial Assumptions (Details)	Dec. 31, 2017	Dec. 31, 2016
Employee Benefits [Abstract]
Discount rate, accrued benefit obligation	3.40%	3.70%
Rate of compensation increase, accrued benefit obligation	2.90%	2.80%
Discount rate, net periodic pension expense	3.70%	3.90%
Rate of compensation increase, net periodic pension expense	2.90%	2.80%

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EMPLOYEE BENEFIT PLANS - Impact of Change to Actuarial Assumptions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Discount rate
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of reasonably possible increase in actuarial assumption	0.50%
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ (13)
Percentage of reasonably possible decrease in actuarial assumption		0.50%
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption		$ 14
Compensation rate
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of reasonably possible increase in actuarial assumption	1.00%
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ 3
Percentage of reasonably possible decrease in actuarial assumption		1.00%
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption		$ (3)
Future life expectancy
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ 4
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption		$ (4)
Duration of reasonably possible increase in actuarial assumption	1 year
Duration of reasonably possible decrease in actuarial assumption		1 year
Retirement age
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ (2)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption		$ 0
Duration of reasonably possible increase in actuarial assumption	1 year
Duration of reasonably possible decrease in actuarial assumption		1 year

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EMPLOYEE BENEFIT PLANS - Asset Allocation (Details)	Dec. 31, 2017	Dec. 31, 2016
Employee Benefits [Abstract]
Equity investments	55.00%	57.00%
Fixed income investments	45.00%	40.00%
Cash	0.00%	3.00%
Total assets	100.00%	100.00%

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EMPLOYEE BENEFIT PLANS - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cost of Sales
Disclosure of defined benefit plans [line items]
Employer contributions	$ 12	$ 11

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EMPLOYEE COMPENSATION AND BENEFITS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Analysis of income and expense [abstract]
Short-term employee compensation and benefits	$ 203	$ 178
Long-term employee compensation and benefits	32	30
Share-based payments	2	2
Employee compensation and benefits	$ 237	$ 210

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FINANCE COSTS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Analysis of income and expense [abstract]
Interest on long-term debt	$ 27	$ 47
Interest on other long-term debt	1	1
Amortization of debt issue costs	2	2
Revolving bank lines fees and other	1	1
Interest expense	31	51
Net interest expense on net pension obligation	(1)	(1)
Total finance costs	32	52
Interest costs capitalised	$ 7	$ 1

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INCOME TAX - Deferred Income Tax Assets (Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax assets	$ 4	$ 4
Deferred income tax liabilities	(151)	(157)
Net deferred income tax liabilities	(147)	(153)
Property, plant and equipment, differences in basis
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred income tax liabilities	200	248
Benefit of tax loss carryforwards
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred income tax liabilities	(38)	(87)
Other temporary differences in basis
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred income tax liabilities	$ (15)	$ (8)

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INCOME TAX - Tax Loss Carryforward (Details) - Dec. 31, 2017 € in Millions, £ in Millions, CAD in Millions, $ in Millions	USD ($)	EUR (€)	CAD	GBP (£)
General Business Tax Credit Carryforward | United States
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Tax loss carryforwards | $	$ 149
General Business Tax Credit Carryforward | Belgium
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Tax loss carryforwards | €		€ 32
General Business Tax Credit Carryforward | United Kingdom
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Tax loss carryforwards | £				£ 1
Capital Loss Carryforward | Canada
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Tax loss carryforwards			CAD 126
Non-Capital Loss Carryforward | Canada
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Tax loss carryforwards			CAD 22

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INCOME TAX - Narrative (Details) € in Millions, CAD in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 CAD	Dec. 31, 2016 EUR (€)	Dec. 31, 2016 CAD
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Income tax benefit to recognize deferred tax asset	$ 14	$ 2
Income tax expense (benefit) relating to components of OCI	2	(7)
Deductible temporary differences	303
Temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements for which deferred tax liabilities have not been recognised	869	698
Net income tax recovery	$ 35	$ 0
Belgium
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deductible temporary differences | €			€ 23		€ 23
Canada
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deductible temporary differences | CAD				CAD 126		CAD 116

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INCOME TAX - Deductible Temporary Differences (Details) $ in Millions	Dec. 31, 2017 USD ($)
Income Taxes [Abstract]
Deductible temporary differences	$ 303
United States – State tax credits	$ 60

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INCOME TAX - Income Tax Components (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
Current income tax expense	$ 90	$ 4
Deferred income tax (recovery) expense	(9)	57
Income tax expense	$ 81	$ 61

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INCOME TAX - Income Tax Expense Calculation and Income Tax Recovery (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]
Earnings before income tax	$ 517	$ 244
Income tax expense at combined Canadian federal and provincial statutory rate of 27% (2016 – 27%)	140	66
Change in tax rates and new legislation	(35)	0
Rate differences on foreign activities	(12)	(7)
Recognition of the benefit of prior years’ tax losses and other deferred tax assets	(14)	(2)
Non-recognition of deferred tax assets relating to foreign exchange gain	1	2
Current income tax expense not previously recognized	0	2
Other	1	0
Income tax expense	$ 81	$ 61
Applicable tax rate	27.00%	27.00%
Actuarial (loss) gain on post-employment obligation	$ (3)	$ 5
Actuarial gain on post-employment obligation, tax	0	0
Actuarial loss on defined benefit pension obligation, net of tax	(3)	5
Foreign currency translation gain (loss) on foreign operations	31	(44)
Foreign currency translation loss on foreign operations, tax	(2)	7
Foreign currency translation loss on foreign operations, net of tax	$ 29	$ (37)

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SHAREHOLDERS' EQUITY - Share Capital (Details) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares
Disclosure of classes of share capital [line items]
Number of share options exercised in share-based payment arrangement | shares	0.6	0.4
Changes in equity [abstract]
Balance, beginning of year	$ 650
Balance, end of year	$ 1,019	$ 650
Share capital
Disclosure of classes of share capital [line items]
Number of share options exercised in share-based payment arrangement | shares	0.6	0.4
Reconciliation of number of shares outstanding [abstract]
Common shares outstanding, beginning of year (in shares) | shares	85.8	85.4
Common shares outstanding, end of year (in shares) | shares	86.4	85.8
Changes in equity [abstract]
Balance, beginning of year	$ 1,341	$ 1,334
Issue of common shares upon exercise of options and Dividend Reinvestment Plan	9	7
Balance, end of year	$ 1,350	$ 1,341

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SHAREHOLDERS' EQUITY - Stock Options Activity (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) shares	Dec. 31, 2017 CAD shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2016 CAD shares
Share Capital, Reserves, And Other Equity Interest [Abstract]
Balance, beginning of year (in shares)	1,800,000	1,800,000	2,300,000	2,300,000
Options granted (in shares)			0	0
Options exercised (in shares)	(600,000)	(600,000)	(400,000)	(400,000)
Options expired (in shares)	0	0	(100,000)	(100,000)
Balance, end of year (in shares)	1,413,227	1,413,227	1,800,000	1,800,000
Exercisable at year-end (in shares)		828,233		1,200,000
Weighted Average Exercise Price, Balance, beginning of year | CAD		CAD 25.28		CAD 24.79
Weighted Average Exercise Price, Options granted	$ 34.96	34.96		0.00
Weighted average exercise price of share options exercised in share-based payment arrangement (in dollars per share)	$ 41.89	15.16	$ 31.71	14.93
Weighted Average Exercise Price, Options expired | CAD		0.00		111.30
Weighted Average Exercise Price, Balance, end of year | CAD		27.23		25.28
Weighted Average Exercise Price, Exercisable at year-end | CAD		CAD 25.03		CAD 25.18

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SHAREHOLDERS' EQUITY SHAREHOLDERS' EQUITY - Narrative (Details) number in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($) shares	Dec. 31, 2017 CAD	Dec. 31, 2016 USD ($) shares	Dec. 31, 2016 CAD shares	Dec. 31, 2013 USD ($) shares
Disclosure of terms and conditions of share-based payment arrangement [line items]
Options granted (in shares) | shares						0	0
Share-based payments		$ 2,000,000				$ 2,000,000
Number of share options exercised in share-based payment arrangement | shares				600,000		400,000	400,000
Proceeds from exercise of options		7,000,000				$ 4,000,000
Stock options exercised		2,000,000				3,000,000
Weighted average exercise price of share options exercised in share-based payment arrangement (in dollars per share)		41.89			CAD 15.16	31.71	CAD 14.93
Dividends reinvested in common shares		1,000,000				$ 1,000,000
Number of warrants exercised (in shares) | shares								134,400,000
Number of shares issued upon exercise of warrants (in shares) | shares								8,400,000
Share capital
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of share options exercised in share-based payment arrangement | shares				600,000		400,000	400,000
Increase (decrease) through exercise of warrants, equity								$ (298,000,000)
Contributed surplus
Disclosure of terms and conditions of share-based payment arrangement [line items]
Stock options exercised		(2,000,000)				$ (2,000,000)
Revaluation surplus
Disclosure of terms and conditions of share-based payment arrangement [line items]
Increase (decrease) through exercise of warrants, equity								35,000,000
Retained earnings
Disclosure of terms and conditions of share-based payment arrangement [line items]
Deficit arising on cashless exercise of warrants in 2013	$ (263,000,000)	(263,000,000)	$ (263,000,000)	$ (263,000,000)		(263,000,000)		$ 263,000,000
Employee Stock Option
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	5 years
Expiration period	10 years
Options granted (in shares)			0.2	200,000
Share-based payments		1,000,000				1,000,000
Restricted Stock Units
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	3 years
Payment date from vesting date	30 days
Restricted Stock Units and Deferred Common Share Units
Disclosure of terms and conditions of share-based payment arrangement [line items]
Liabilities from share-based payment transactions	$ 5,000,000	5,000,000	$ 5,000,000	$ 5,000,000		4,000,000
Restricted Stock Units and Deferred Common Share Units | Other Liabilities
Disclosure of terms and conditions of share-based payment arrangement [line items]
Liabilities from share-based payment transactions	3,000,000	3,000,000	3,000,000	3,000,000		3,000,000
Restricted Stock Units and Deferred Common Share Units | Accounts Payable and Accrued Liabilities
Disclosure of terms and conditions of share-based payment arrangement [line items]
Liabilities from share-based payment transactions	$ 2,000,000	$ 2,000,000	$ 2,000,000	$ 2,000,000		$ 1,000,000

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SHAREHOLDERS' EQUITY - Stock Option Fair Value Assumptions (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) year	Dec. 31, 2017 CAD year	Dec. 31, 2016 CAD
Share Capital, Reserves, And Other Equity Interest [Abstract]
Risk-free interest rate	1.10%	1.10%
Expected volatility	30.00%	30.00%
Dividend yield	1.10%	1.10%
Expected option life (years) | year	5	5
Share price (in Canadian dollars)		CAD 37.72
Exercise price (in Canadian dollars)	$ 34.96	34.96	CAD 0.00
Weighted average fair value per option granted (in Canadian dollars)		CAD 7.47

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SHAREHOLDERS' EQUITY - Stock Option Exercise Price Ranges (Details)	Dec. 31, 2017 CAD year shares	Dec. 31, 2016 CAD shares	Dec. 31, 2015 CAD shares
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Options (in shares) | shares	1,413,227	1,800,000	2,300,000
Weighted Average Remaining Contractual Life (years) | year	6.00
Options Outstanding, Weighted Average Exercise Price (CAD $)	CAD 27.23	CAD 25.28	CAD 24.79
Options Exercisable (in shares) | shares	828,233	1,200,000
Options Exercisable, Weighted Average Exercise Price (CAD $)	CAD 25.03	CAD 25.18
$6.50–$10.00
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Options (in shares) | shares	157,000
Weighted Average Remaining Contractual Life (years) | year	4.08
Options Outstanding, Weighted Average Exercise Price (CAD $)	CAD 9.96
Options Exercisable (in shares) | shares	157,000
Options Exercisable, Weighted Average Exercise Price (CAD $)	CAD 9.96
$10.01–$15.00
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Options (in shares) | shares	129,862
Weighted Average Remaining Contractual Life (years) | year	2.98
Options Outstanding, Weighted Average Exercise Price (CAD $)	CAD 14.58
Options Exercisable (in shares) | shares	129,862
Options Exercisable, Weighted Average Exercise Price (CAD $)	CAD 14.58
$15.01–$20.00
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Options (in shares) | shares	108,210
Weighted Average Remaining Contractual Life (years) | year	2.22
Options Outstanding, Weighted Average Exercise Price (CAD $)	CAD 18.04
Options Exercisable (in shares) | shares	108,210
Options Exercisable, Weighted Average Exercise Price (CAD $)	CAD 18.04
$20.01–$25.00
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Options (in shares) | shares	11,409
Weighted Average Remaining Contractual Life (years) | year	6.45
Options Outstanding, Weighted Average Exercise Price (CAD $)	CAD 21.44
Options Exercisable (in shares) | shares	11,409
Options Exercisable, Weighted Average Exercise Price (CAD $)	CAD 21.44
$25.01–$30.00
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Options (in shares) | shares	457,420
Weighted Average Remaining Contractual Life (years) | year	7.42
Options Outstanding, Weighted Average Exercise Price (CAD $)	CAD 27.25
Options Exercisable (in shares) | shares	172,420
Options Exercisable, Weighted Average Exercise Price (CAD $)	CAD 27.32
$30.01–$35.00
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Options (in shares) | shares	458,696
Weighted Average Remaining Contractual Life (years) | year	7.16
Options Outstanding, Weighted Average Exercise Price (CAD $)	CAD 32.35
Options Exercisable (in shares) | shares	158,702
Options Exercisable, Weighted Average Exercise Price (CAD $)	CAD 30.53
$60.90
Disclosure of range of exercise prices of outstanding share options [line items]
Range of Exercise Prices (CAD $)	CAD 60.90
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Options (in shares) | shares	90,630
Weighted Average Remaining Contractual Life (years) | year	0.10
Options Outstanding, Weighted Average Exercise Price (CAD $)	CAD 60.90
Options Exercisable (in shares) | shares	90,630
Options Exercisable, Weighted Average Exercise Price (CAD $)	CAD 60.90
Minimum | $6.50–$10.00
Disclosure of range of exercise prices of outstanding share options [line items]
Range of Exercise Prices (CAD $)	6.50
Minimum | $10.01–$15.00
Disclosure of range of exercise prices of outstanding share options [line items]
Range of Exercise Prices (CAD $)	10.01
Minimum | $15.01–$20.00
Disclosure of range of exercise prices of outstanding share options [line items]
Range of Exercise Prices (CAD $)	15.01
Minimum | $20.01–$25.00
Disclosure of range of exercise prices of outstanding share options [line items]
Range of Exercise Prices (CAD $)	20.01
Minimum | $25.01–$30.00
Disclosure of range of exercise prices of outstanding share options [line items]
Range of Exercise Prices (CAD $)	25.01
Minimum | $30.01–$35.00
Disclosure of range of exercise prices of outstanding share options [line items]
Range of Exercise Prices (CAD $)	30.01
Maximum | $6.50–$10.00
Disclosure of range of exercise prices of outstanding share options [line items]
Range of Exercise Prices (CAD $)	10.00
Maximum | $10.01–$15.00
Disclosure of range of exercise prices of outstanding share options [line items]
Range of Exercise Prices (CAD $)	15.00
Maximum | $15.01–$20.00
Disclosure of range of exercise prices of outstanding share options [line items]
Range of Exercise Prices (CAD $)	20.00
Maximum | $20.01–$25.00
Disclosure of range of exercise prices of outstanding share options [line items]
Range of Exercise Prices (CAD $)	25.00
Maximum | $25.01–$30.00
Disclosure of range of exercise prices of outstanding share options [line items]
Range of Exercise Prices (CAD $)	30.00
Maximum | $30.01–$35.00
Disclosure of range of exercise prices of outstanding share options [line items]
Range of Exercise Prices (CAD $)	CAD 35.00

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SHAREHOLDERS' EQUITY - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of analysis of other comprehensive income by item [line items]
Actuarial loss on defined benefit pension obligation, net of tax	$ (3)	$ 5
Accumulated other comprehensive loss, net of tax	1,019	650
Tax	(2)	7
Income tax relating to actuarial loss on defined benefit pension obligation	0	0
Accumulated other comprehensive loss
Disclosure of analysis of other comprehensive income by item [line items]
Foreign currency translation loss on investment in foreign operations, net of tax of $(3) (December 31, 2015 – $(10))	(138)	(167)
Net loss on hedge of net investment in foreign operations, net of tax of $3 (December 31, 2015 – $3)	(8)	(8)
Actuarial loss on defined benefit pension obligation, net of tax	(30)	(27)
Accumulated other comprehensive loss, net of tax	(176)	(202)	$ (170)
Tax	(5)	(3)
Income tax relating to hedges of net investments in foreign operations	3	3
Income tax relating to actuarial loss on defined benefit pension obligation	$ 9	$ 9

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EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Earnings per share [abstract]
Earnings available to common shareholders	$ 436	$ 183
Common shares (millions):
Weighted average number of common shares outstanding	86.2	85.6
Dilutive stock options (in shares)	0.4	0.5
Diluted number of common shares	86.6	86.1
Earnings per common share:
Basic (in dollars per share)	$ 5.06	$ 2.14
Diluted (in dollars per share)	$ 5.03	$ 2.13

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EARNINGS PER COMMON SHARE - Narrative (Details) - shares shares in Millions	Dec. 31, 2017	Dec. 31, 2016
Earnings per share [abstract]
Antidilutive securities (in shares)	0.1	0.5

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SUPPLEMENTAL CASH FLOW INFORMATION - Other Items (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash Flow Statement [Abstract]
Stock-based compensation	$ 4	$ 2
Pension funding (greater) less than expense	(3)	(3)
Cash interest paid less than interest expense	(6)	0
Amortization of debt issue costs	2	2
Unrealized (gain) loss on outstanding forwards	(1)	1
Unrealized foreign exchange gain on translation of monetary balances	(4)	(1)
Unrealized foreign exchange gain on translation of tax balances	(1)	0
Other	1	(3)
Other items	$ (8)	$ (2)

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SUPPLEMENTAL CASH FLOW INFORMATION - Net Change in Non-Cash Working Capital (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash (used for) provided by:
Accounts receivable	$ (33)	$ (20)
Prepaids	(1)	0
Inventory	(37)	(10)
Accounts payable and accrued liabilities	53	25
Increase (decrease) in working capital	(18)	(5)
Cash income taxes paid, net	$ 2	$ 2

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SUPPLEMENTAL CASH FLOW INFORMATION - Net Change in Financial Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash Flow Statement [Abstract]
Long-term debt	$ (198)	$ 0
Other long-term debt	0	(30)
Accrued interest on long-term debt	(6)	2
Net decrease in financial liabilities	$ (204)	$ (28)

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SUPPLEMENTAL CASH FLOW INFORMATION - Cash and Non-Cash Movements in Financial Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash movements:
Repayment of debt	$ (200)	$ 0
Interest paid	(42)	(50)
A/R securitization repayments	0	(30)
Cash movements	(242)	(80)
Non-cash movements:
Amortization of debt issue costs	2	2
Interest expense	36	50
Interest expense	38	52
Net decrease in financial liabilities	$ (204)	$ (28)

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FINANCIAL INSTRUMENTS - Narrative (Details) CAD in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 CAD	Dec. 31, 2016 EUR (€)	Dec. 31, 2016 CAD	Dec. 31, 2015 USD ($)
Disclosure of detailed information about hedging instruments [line items]
Cash and cash equivalents	$ 241,000,000	$ 161,000,000					$ 9,000,000
Debt issue costs	7,000,000	9,000,000
Revolving Bank Line
Disclosure of detailed information about hedging instruments [line items]
Undrawn borrowing facilities	0
Unutilized borrowing facilities	226,000,000	220,000,000
Securitisations
Disclosure of detailed information about hedging instruments [line items]
Recognised liabilities representing continuing involvement in derecognised financial assets	0	0
Unutilized borrowing facilities	125,000,000
Foreign Currency Forward Contracts | Cash flow hedges [member]
Disclosure of detailed information about hedging instruments [line items]
Nominal amount of hedging instrument | CAD				CAD 41		CAD 49
Unrealized gain (loss) on derivatives	1,000,000	1,000,000
Gains (losses) on financial assets at fair value through profit or loss	4,000,000	1,000,000
Sensitivity analysis on derivative instrument, change in exchange rate, impact	1,000,000
Foreign Currency Options [Member] | Cash flow hedges [member]
Disclosure of detailed information about hedging instruments [line items]
Nominal amount of hedging instrument | €			€ 60,000,000		€ 0
Unrealized gain (loss) on derivatives	1,000,000	0
Sensitivity analysis on derivative instrument, change in exchange rate, impact	$ 1,000,000
Commodity price risk | Expected Natural Gas Consumption
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument, percentage	6.00%
Commodity price risk | Forecasted Electricity Consumption
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument, percentage purchased in regulated markets	62.00%
Commodity price risk | Deregulated Electricity Consumption
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument, percentage	43.00%
Currency risk
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument, maximum percentage of foreign exchange exposures	100.00%
Hedging instrument, period	3 years
Credit risk | Trade receivables
Disclosure of detailed information about hedging instruments [line items]
Allowance account for credit losses of financial assets	$ 1,000,000	$ 1,000,000
Sales | One customer | Credit risk
Disclosure of detailed information about hedging instruments [line items]
Concentration risk percentage (greater than)	10.00%

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FINANCIAL INSTRUMENTS - Future Cash Outflows for Financial Liabilities (Details) $ in Millions	Dec. 31, 2017 USD ($)
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Principal	$ 555
Interest	147
Long-term debt, including interest	702
Less than 1 Year
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Principal	0
Interest	33
Long-term debt, including interest	33
2019
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Principal	0
Interest	33
Long-term debt, including interest	33
2020
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Principal	240
Interest	33
Long-term debt, including interest	273
2021
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Principal	0
Interest	19
Long-term debt, including interest	19
2022
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Principal	0
Interest	19
Long-term debt, including interest	19
Thereafter
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Principal	315
Interest	10
Long-term debt, including interest	$ 325

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FINANCIAL INSTRUMENTS - Book and Fair Values of Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of financial assets [line items]
Net Book Value	$ 417	$ 302
Fair Value	417	302
Disclosure of financial liabilities [line items]
Net Book Value	866	1,000
Fair Value	908	1,022
Accounts payable and accrued liabilities | Other financial liabilities
Disclosure of financial liabilities [line items]
Net Book Value	282	218
Fair Value	282	218
Long-term debt | Other financial liabilities
Disclosure of financial liabilities [line items]
Net Book Value	555	755
Fair Value	597	777
Other liabilities | Other financial liabilities
Disclosure of financial liabilities [line items]
Net Book Value	29	27
Fair Value	29	27
Cash and cash equivalents | Fair value through profit or loss
Disclosure of financial assets [line items]
Net Book Value	241	161
Fair Value	241	161
Accounts receivable | Loans and receivables
Disclosure of financial assets [line items]
Net Book Value	174	141
Fair Value	174	141
Other assets | Loans and receivables
Disclosure of financial assets [line items]
Net Book Value	2	0
Fair Value	$ 2	$ 0

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COMMITMENTS AND CONTINGENCIES (Details) $ in Millions	Dec. 31, 2017 USD ($)
Disclosure of contingent liabilities [line items]
Purchase commitments	$ 202
Operating leases	17
Reforestation obligation	3
Commitments	222
Less than 1 Year
Disclosure of contingent liabilities [line items]
Purchase commitments	100
Operating leases	5
Reforestation obligation	2
Commitments	107
1–5 Years
Disclosure of contingent liabilities [line items]
Purchase commitments	97
Operating leases	10
Reforestation obligation	0
Commitments	107
Thereafter
Disclosure of contingent liabilities [line items]
Purchase commitments	5
Operating leases	2
Reforestation obligation	1
Commitments	$ 8

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RELATED PARTY TRANSACTIONS - Narrative (Details) shares in Millions, $ in Millions				12 Months Ended
	Oct. 13, 2017 shares	Aug. 09, 2017	Aug. 02, 2017 CAD / shares shares	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Disclosure of transactions between related parties [line items]
Sale of stock, price per share | CAD / shares			CAD 42.35
Norbord | Brookfield
Disclosure of transactions between related parties [line items]
Sale of stock, number of shares issued in transaction (in shares) | shares			3.6
Proportion of ownership interest in associate	40.00%	49.00%
Number of shares issued | shares	7.1
Brookfield
Disclosure of transactions between related parties [line items]
Indemnity commitment				$ 1
Services received from related party transactions				$ 1	$ 1
Interex Forest Products Ltd.
Disclosure of transactions between related parties [line items]
Proportion of ownership interest in associate				25.00%
Revenue from sale from related party transactions				$ 78	62
Amounts receivable from related party transactions				3	2
Investments accounted for using equity method, less than				$ 1	$ 1

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RELATED PARTY TRANSACTIONS - Compensation of Key Management Personnel (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Related Party [Abstract]
Salaries, incentives and short-term benefits	$ 4	$ 3
Share-based awards	1	1
Compensation of Key Management Personnel	$ 5	$ 4

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GEOGRAPHIC SEGMENTS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of operating segments [line items]
Sales	$ 2,177	$ 1,766
EBITDA	656	390
Depreciation and amortization	107	94
Additions to property, plant and equipment	253	101
Property, plant and equipment	1,421	1,262
Operating segments | North America
Disclosure of operating segments [line items]
Sales	1,747	1,361
EBITDA	627	363
Depreciation and amortization	94	80
Additions to property, plant and equipment	142	60
Property, plant and equipment	1,168	1,126
Operating segments | Europe
Disclosure of operating segments [line items]
Sales	430	405
EBITDA	39	41
Depreciation and amortization	13	14
Additions to property, plant and equipment	111	41
Property, plant and equipment	253	136
Unallocated
Disclosure of operating segments [line items]
Sales	0	0
EBITDA	(10)	(14)
Depreciation and amortization	0	0
Additions to property, plant and equipment	0	0
Property, plant and equipment	$ 0	$ 0

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ASSET EXCHANGE AGREEMENT (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]
Gain on asset exchange	$ 0	$ 16
Income tax expense	(81)	(61)
Cash	241	161	$ 9
Property, plant and equipment	1,421	1,262
Other liabilities	(29)	(27)
Deferred income tax liabilities	$ (151)	(157)
Asset exchange transaction for OSB Mills
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]
Gain on asset exchange		16
Income tax expense		(4)
Gain on asset exchange, net		12
Cash		7
Property, plant and equipment		11
Other liabilities		(2)
Deferred income tax liabilities		(4)
Increase in net assets		12
Cash received relating to the removal of a restrictive land-use covenant in 2016		$ 7