Debt Tender Offer, Maximum Aggregate Purchase Price

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- Definition

Extended Financing Agreement Term

+ References

No definition available.

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- Definition

Line Of Credit Facility, Committed Amount

+ References

No definition available.

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- Definition

Line of credit facility aggregate commitment amount.

+ References

No definition available.

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- Definition

Line Of Credit Facility, Number Of Extension Options

+ References

No definition available.

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- Definition

Number Of Credit Facilities Terminated

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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- Definition

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

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-Name Accounting Standards Codification
-Topic 210
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- Definition

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.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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.

+ References

No definition available.

+ Details

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- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
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- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Balance Type:	credit
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- Definition

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

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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DEBT AND FINANCING COSTS - Additional Information (Detail) £ in Millions			1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 24, 2018 USD ($)	Aug. 23, 2018 USD ($)	Mar. 31, 2018 USD ($) contract	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2018 GBP (£)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 GBP (£)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Debt instrument, face amount				$ 8,299,000,000		$ 8,299,000,000				$ 8,580,000,000
Loss on extinguishment of debt				94,000,000	$ 0	94,000,000		$ 1,000,000
Number of credit facilities terminated \| contract			2
Write off of deferred loan costs			$ 4,000,000
Commercial Paper
Debt Instrument [Line Items]
Debt instrument, face amount				3,500,000,000.0		$ 3,500,000,000.0
Debt instrument term						270 days	270 days
7.625% senior notes due July 1, 2019
Debt Instrument [Line Items]
Debt instrument, face amount				$ 150,000,000		$ 150,000,000
Debt instrument, stated interest rate				7.625%		7.625%			7.625%
6.9% senior notes due September 15, 2018
Debt Instrument [Line Items]
Debt instrument, face amount										$ 400,000,000
Debt instrument, stated interest rate										6.90%
7.0% senior notes due February 1, 2018
Debt Instrument [Line Items]
Debt instrument, face amount										$ 150,000,000
Debt instrument, stated interest rate										7.00%
4.375% notes due 2028
Debt Instrument [Line Items]
Debt instrument, stated interest rate		4.375%
Debt tender offer, maximum aggregate purchase price		$ 1,000,000,000
Line of Credit \| USD Credit Facility
Debt Instrument [Line Items]
Debt extinguished amount						$ 3,500,000,000
Line of Credit \| Letter of Credit
Debt Instrument [Line Items]
Line of credit facility, committed amount				$ 2,080,000,000		2,080,000,000
Credit facility maximum borrowing capacity				3,000,000,000.0		3,000,000,000.0
Line of credit facility aggregate commitment amount \| £									£ 129.1
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, number of extension options \| contract			2
Extended financing agreement term			1 year
Line of credit facility, committed amount				4,000,000,000		4,000,000,000
Credit facility maximum borrowing capacity				5,000,000,000.0		5,000,000,000.0
Letters of credit outstanding, amount				$ 0		$ 0
Line of Credit \| GBP Credit Facility
Debt Instrument [Line Items]
Debt extinguished amount \| £							£ 900.0
Senior Notes
Debt Instrument [Line Items]
Debt repurchased face amount	$ 731,440,000.00
Debt extinguished amount	828,000,000
Loss on extinguishment of debt	94,000,000
Unamortized debt issuance costs and discount	$ 5,000,000