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Line Of Credit Facility, Number Of Extension Options

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Line of Credit Facility, Term

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Maximum potential lien on assets located in specified regions.

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Percentage of liens of companies consolidated asset.

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Period for borrowing funds.

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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

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

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

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt premium.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity.

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

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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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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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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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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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The carrying value as of the balance sheet date of the current portion 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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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 after 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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Indebtedness divided by net capital.

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DEBT - Additional Information (Detail)	1 Months Ended		3 Months Ended	12 Months Ended
DEBT - Additional Information (Detail)	Jan. 31, 2017 USD ($)	Jun. 30, 2015 USD ($) Contract	Dec. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) Contract	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 GBP (£)	Aug. 31, 2017 USD ($)	Nov. 30, 2016 USD ($)	Feb. 29, 2016 GBP (£)
Debt Instrument [Line Items]
Loss on extinguishment of debt	$ 1,000,000			$ 1,000,000	$ 1,000,000	$ 39,000,000
Debt before unamortized discount and deferred loan costs				8,580,000,000
Repayments of debt principal after year five				6,573,000,000
Line of credit outstanding				0
Commercial paper program				3,500,000,000
Discount of debt amortization				3,000,000	3,000,000	$ 3,000,000
Senior Notes
Debt Instrument [Line Items]
Debt repurchased principle amount	69,000,000		$ 181,000,000		181,000,000
Early repayment of senior notes	71,000,000		182,000,000
Debt premium	$ 1,000,000								$ 500,000
Loss on extinguishment of debt			1,000,000
Unsecured Debt
Debt Instrument [Line Items]
Debt before unamortized discount and deferred loan costs			8,650,000,000	8,580,000,000	8,650,000,000
Deferred loan costs			56,000,000	49,000,000	56,000,000
Unamortized discount			50,000,000	47,000,000	50,000,000
Maximum \| Senior Notes
Debt Instrument [Line Items]
Debt repurchased principle amount									$ 250,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum potential lien on assets located in specified regions				$ 1,100,000,000
Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Percentage of liens of companies consolidated asset				5.00%			5.00%
Commercial Paper
Debt Instrument [Line Items]
Period for borrowing funds				270 days
Short-term debt outstanding			0	$ 0	0
7.75% notes due in 2029 \| Senior Notes
Debt Instrument [Line Items]
Debt before unamortized discount and deferred loan costs								$ 300,000,000
Debt interest rate								7.75%
7.75% notes due in 2029 \| Unsecured Debt
Debt Instrument [Line Items]
Debt before unamortized discount and deferred loan costs			$ 300,000,000	$ 300,000,000	$ 300,000,000
Debt interest rate				7.75%			7.75%
2015 Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility term		5 years
Line of credit facility, number of extension options \| Contract		2
Credit facility, extension period for maturity		1 year
Line of credit facility maximum borrowing capacity		$ 3,500,000,000.0
Line of credit facility, available borrowing capacity				$ 3,500,000,000
Quarterly facility fees at per annum rate				0.175%
2015 Credit Facility \| Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Line of credit facility, commitment amount		4,500,000,000.0
Debt-to-capital ratio				0.60			0.60
2015 Credit Facility \| Revolving Credit Facility \| Base Rate
Debt Instrument [Line Items]
Margin percentage				0.075%
2015 Credit Facility \| Revolving Credit Facility \| LIBOR
Debt Instrument [Line Items]
Margin percentage				1.075%
2015 Credit Facility \| Letter of Credit
Debt Instrument [Line Items]
Letter of credit subfacility		$ 750,000,000
2016 Credit Facility \| Letter of Credit
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity \| £										£ 1,075,000,000.000
Quarterly facility fees at per annum rate				0.175%
Letter of credit facility \| £										£ 900,000,000
Number of debt instrument \| Contract				3
Letters of credit outstanding, amount \| £							£ 129,100,000
2016 Credit Facility \| Letter of Credit \| Base Rate
Debt Instrument [Line Items]
Margin percentage				0.075%
2016 Credit Facility \| Letter of Credit \| LIBOR
Debt Instrument [Line Items]
Margin percentage				1.075%