Debt - Additional Information (Detail) (USD $)	3 Months Ended
Mar. 31, 2015
New Credit Facility [Member]
Debt Instrument [Line Items]
Syndicated revolving credit facility	$ 4,000,000,000
Maturity of revolving credit facilities	2020-01
Interest rate on the borrowings on the credit facility description	1.075% above the London Interbank Offered Rate
Credit facility fee (per annum)	0.175%
Previous Credit Facility [Member]
Debt Instrument [Line Items]
Syndicated revolving credit facility	4,000,000,000
Maturity of revolving credit facilities	2016-04
Letters of credit outstanding amount	$ 0

Maturity of revolving credit facilities.

No definition available.

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- Details

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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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Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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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.

+ References

+ Details

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Period Type:	instant

- Details

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- Details

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