Accounts payable and accrued liabilities Accrued Income Taxes, Current Income taxes payable Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income Accumulated other comprehensive income Additional Financial Information Disclosure. Miscellaneous financial information Adjustments for non-cash items: Amendment Flag Total assets (note 3) Total assets (note 3) Assets Total current assets Total current assets Current Assets Capitalized lease obligations (note 14) Cash Cash at end of year Cash at beginning of year Increase (decrease) in cash Increase (decrease) in cash Commitments and contingent liabilities (note 10) Litigation and other contingencies This element may be used to capture the disclosure pertaining to an entity's common stock, including shares authorized, number and dollar amount of share purchased, number and dollar amount of shares issued and purchased under the stock option plan, basic and diluted earnings per share and other information necessary to a fair presentation. Common shares Dividends Common shares at stated value (note 11) Common Stock, Value, Issued Common shares at stated value (note 11) Comprehensive income for the year Total comprehensive income for the year Total comprehensive income for the year Total expenses Total expenses Expenses Purchase cost of crude oil, products and other raw materials, feedstocks, semi finished products, finished products and other merchandise that become part of salable products for oil and gas, refining and marketing and chemical operations. Purchases of crude oil and products Cumulative effect of accounting change (note 4) Current Fiscal Year End Date Notes and loans payable (note 13) The component of income tax expense for the period representing the net change in the entity's deferred tax assets and liabilities pertaining to continuing operations. Prior year Exploration and Exploratory dry hole costs written off as expense in the current year. Entity's net proportionate share for the period of net earnings, less dividends, of its investment to which the equity method of accounting is applied. Deferred income taxes and other Deferred income tax assets (note 4) Deferred income tax liabilities (note 4) Depreciation and depletion Derivatives and financial instruments Share-based incentive compensation programs Dividends, Cash Dividends Document Information [Text Block] Document Period End Date Document Type Per-share information (Canadian dollars) Net income per common share - basic (note 11) Net income per common share - diluted (note 11) Entity Central Index Key Entity Common Stock, Shares Outstanding Entity Current Reporting Status Entity [Domain] Entity Filer Category Entity Public Float Entity Registrant Name Entity [Text Block] Entity Voluntary Filers Entity Well-known Seasoned Issuer Equity Component [Domain] Exploration The amount of federal excise tax included in sales and revenues, which are then deducted as an expense. Federal excise tax Other intangible assets, net Goodwill (note 3) Sum of operating profit and nonoperating income (expense) before income taxes. Income before income taxes Income before income taxes Income Statement [Abstract] Income taxes Income taxes (note 4) Accounts payable Accounts receivable Accounts receivable Increase (Decrease) in Accrued Income Taxes Payable Income taxes payable The net change during the reporting period in the aggregate value of all inventory, materials and supplies held by the reporting entity, associated with underlying transactions that are classified as operating activities. And the net change during the reporting period in the amount of outstanding money paid in advance for goods or services that bring economic benefits for future periods. Inventories and prepaids Inventories and prepaids Changes in operating assets and liabilities: All other items - net All other items - net Financing costs (note 13) Disclosure of interest expense. Financing costs Inventories of crude oil and products (note 12) Details of investment and other income including the aggregate before and after tax gain (loss) on the proceeds from the sale of assets (including subsidiaries, cost and equity method investments and property, plant and equipment) over book value. Investment and other income Gains and losses on disposal of assets. Interest income represents earnings which reflect the time value of money or transactions in which the payments are for the use or forbearance of money. Entity's net proportionate share for the period of the undistributed net income (loss) of its investment to which the equity method of accounting is applied. Other income reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement due to materiality considerations. Investment and other income (note 9) Legal Entity [Axis] Total liabilities Total liabilities Liabilities Total liabilities and shareholders' equity Total liabilities and shareholders' equity Total current liabilities Total current liabilities Current liabilities Long-term receivables, investments and other long-term assets Carrying amount as of the balance sheet date for elements of machinery or equipment held for the purpose of replacing similar parts in the course of repair or maintenance. Expenditures made in advance of when the economic benefit of the cost will be realized, and which will be expensed in future periods with the passage of time or when a triggering event occurs. Materials, supplies and prepaid expenses Cash from (used in) financing activities Cash from (used in) financing activities Financing activities Cash from (used in) investing activities Cash from (used in) investing activities Investing activities Cash from operating activities Cash from operating activities Operating activities Cash flow adjustment for the noncash net (gain) included in net income from sales of assets, including subsidiaries, cost and equity method investments and property, plant and equipment. Proceeds from asset sales are reported as an investing activity. (Gain)/loss on asset sales (Gain)/loss on asset sales Net income Net income for the year Net income Notes to Financial Statements [Abstract] Notes to Financial Statements [Abstract] General description of lessee's operating and capital leasing arrangements. Leased facilities and capitalized lease obligations Total revenue from sales of goods and services during the reporting period, reduced by sales returns and allowances and sales discounts. Also includes federal excise tax which is then deducted as an expense. Operating revenues Post-retirement benefits liability adjustment Post-retirement benefits liability adjustment (note 5) Other comprehensive income The adjustment out of other comprehensive income for prior service costs, actuarial gains and losses and other previously recorded other comprehensive income recognized as a component of net period benefit cost during the period, after tax. Amortization of post-retirement benefits liability adjustment included in net periodic benefit cost Other long-term obligations Other long-term obligations (note 6) Parent Company [Member] Common shares purchased (note 11) Common shares purchased (note 11) Dividends paid Dividends paid Additions to property, plant and equipment and intangibles Additions to property, plant and equipment and intangibles Employee retirement benefits Long-term debt issued Loans to equity company Short-term debt - net The cash inflow from the sale of subsidiaries, cost and equity method investments and property, plant and equipment. Proceeds from asset sales Issuance of common shares under stock option plan Costs, excluding deprecation, incurred to operate and maintain - 1) oil and gas wells, production, transportation and support equipment and facilities; 2) refining manufacturing facilities; and 3) chemical manufacturing facilities. Production and manufacturing Property, plant and equipment, less accumulated depreciation and depletion (note 3) Accounts receivable, less estimated doubtful amounts Transactions with related parties Reduction in capitalized lease obligations Reduction in capitalized lease obligations Repayment of long-term debt Repayment of long-term debt Retained Earnings (Accumulated Deficit) Earnings reinvested Earnings reinvested Revenues and other income Accounting changes Business segments Selling and general Excess of the purchase price of common stock over the stated value charged to retain earnings during the period. Share purchases in excess of stated value Share purchases in excess of stated value Summary of significant accounting policies Statement, Equity Components [Axis] Statement [Line Items] Statement of Cash Flows [Abstract] Statement of Financial Position [Abstract] Statement of Stockholders' Equity [Abstract] Statement [Table] Total shareholders' equity At end of year At beginning of year Total shareholders' equity Shareholders' equity Issued under the stock option plan Share purchases at stated value Share purchases at stated value Total revenues and income from equity affiliates and other income. Total revenues and other income Total revenues and other income Trading Symbol