Derivative Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2012
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate, stated rate	5.76%
Senior Notes, interest at 6.25%, maturing 2013 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate, stated rate		6.25%
Senior Notes, interest at 7.875%, maturing 2014 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate, stated rate		7.875%
Euro forward contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 45
Average exchange rate on forward contracts	1.25
Maturity period of forward contracts, less than	1 year
Forward contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	1,928
Maturity period of forward contracts, less than	1 year
Interest rate swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	250	400
Interest rate swap agreements maturity date	2018 and 2019
Gain resulting from termination of interest rate swaps		$ 9

Interest Rate Swap Agreements Expiration Date

No definition available.

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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- Definition

Average period remaining before foreign currency exchange rate derivatives mature or expire, 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

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

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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

+ Details

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- Definition

Average contractual rate at which a foreign currency can be purchased or sold.

+ References

No definition available.

+ Details

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- Definition

Amount of increase in the fair value of derivatives recognized in the income statement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (a),(c),(d),(e)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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