At the balance sheet date the amount of additional secured debt the Corporation has the ability to borrow.

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Debt instrument covenant, percentage.

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Debt instrument maturity period.

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No definition available.

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Debt instrument maturity year.

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No definition available.

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Fixed rate notes gross principle amount.

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No definition available.

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Interest coverage ratio.

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No definition available.

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Leverage ratio.

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No definition available.

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Maturity of revolving credit facilities.

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No definition available.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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No definition available.

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Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants.

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Face (par) amount of debt instrument at time of issuance.

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-Name Accounting Standards Codification
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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Face (par) amount of the original debt instrument that was repurchased.

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No definition available.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Weighted average interest rate of debt outstanding.

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No definition available.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount of interest capitalized during the period.

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-Name Accounting Standards Codification
-Glossary Allowance for Funds Used during Construction
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-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Debt - Additional Information (Detail) - USD ($)			1 Months Ended		12 Months Ended
Debt - Additional Information (Detail) - USD ($)	Jul. 02, 2015	Jul. 01, 2015	Oct. 31, 2016	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Aggregate long-term debt, maturing in 2017					$ 112,000,000
Aggregate long-term debt, maturing in 2018					123,000,000
Aggregate long-term debt, maturing in 2019					448,000,000
Aggregate long-term debt, maturing in 2020					598,000,000
Aggregate long-term debt, maturing in 2021					0
Fair value of total debt					7,548,000,000	$ 6,515,000,000
Net proceeds from senior notes issued				$ 1,380,000,000	1,380,000,000
Repayments of debt					1,455,000,000	67,000,000	$ 590,000,000
Loss on debt extinguishment					148,000,000	0	0
Fixed-rate notes, gross principal amount					$ 5,938,000,000	$ 5,650,000,000
Weighted average interest rate					6.00%	6.40%
Additional secured debt allowed to be borrowed					$ 4,585,000,000
Capitalized interest					61,000,000	$ 45,000,000	$ 76,000,000
Letters of credit – Issued					27,000,000	32,000,000
Bakken Midstream
Debt Instrument [Line Items]
Unsecured debt issued		$ 600,000,000			600,000,000	600,000,000
Revolving credit facility - Capacity		$ 400,000,000			400,000,000	400,000,000
Revolving credit facility - Outstanding amount					$ 153,000,000	$ 110,000,000
Term Loan A facility - Term	5 years	5 years			5 years	5 years
Revolving credit facility - Term	5 years				5 years	5 years
Leverage ratio - Maximum					500.00%
Interest coverage ratio - Minimum					2.25 to 1.0
London Interbank Offered Rate (LIBOR) \| Bakken Midstream \| Minimum
Debt Instrument [Line Items]
Interest rate					1.10%
London Interbank Offered Rate (LIBOR) \| Bakken Midstream \| Maximum
Debt Instrument [Line Items]
Interest rate					2.00%
Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility - Capacity					$ 4,000,000,000
Revolving credit facility - Expiration date					2020-01
Revolving credit facility – Interest rate					1.3% above the London Interbank Offered Rate
Debt instrument covenant, description					The facility contains a financial covenant that limits the amount of total borrowings on the last day of each fiscal quarter to 65% of the Corporation’s total capitalization, defined as total debt plus stockholders’ equity.
Debt instrument covenant, percentage					65.00%
Revolving credit facility - Outstanding amount					$ 0
Letters of credit – Issued					$ 0
Revolving Credit Facility \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate					1.30%
Tendered and Redeemed Notes
Debt Instrument [Line Items]
Loss on debt extinguishment					$ 148,000,000
4.30 % Senior Notes Due April 2027
Debt Instrument [Line Items]
Unsecured debt issued				$ 1,000,000,000	$ 1,000,000,000
Debt instrument maturity year				2027-04	2027-04
Debt instrument coupon rate				4.30%	4.30%
5.80 % Senior Notes Due April 2047
Debt Instrument [Line Items]
Unsecured debt issued				$ 500,000,000	$ 500,000,000
Debt instrument maturity year				2047-04	2047-04
Debt instrument coupon rate				5.80%	5.80%
8.125% Notes Due 2019
Debt Instrument [Line Items]
Debt instrument coupon rate				8.125%	8.125%
Repayments of debt				$ 1,380,000	$ 1,380,000
Notes repurchase principal amount				$ 650,000,000	$ 650,000,000
Debt instrument maturity year				2019	2019
7.875% Notes Due 2029
Debt Instrument [Line Items]
Debt instrument coupon rate			7.875%		7.875%
Notes repurchase principal amount			$ 196,000,000		$ 196,000,000
Debt instrument maturity year			2029		2029
7.300% Notes Due 2031
Debt Instrument [Line Items]
Debt instrument coupon rate			7.30%		7.30%
Notes repurchase principal amount			$ 66,000,000		$ 66,000,000
Debt instrument maturity year			2031		2031
1.300% Notes Due 2017
Debt Instrument [Line Items]
Debt instrument coupon rate			1.30%		1.30%
Notes repurchase principal amount			$ 300,000,000		$ 300,000,000
Debt instrument maturity year			2017		2017