Schedule of Cash Flow Hedges Effect on Accumulated Other Comprehensive Income, Net of Taxes (Detail) (Cash Flow Hedges, USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated gain / (loss) at beginning of period	$ 117	$ (38)	$ (297)
Transfer of realized (gains) / losses to earnings	(40)	53	312
Unrealized gain / (loss)	(79)	102	(75)
Discontinued operations			(134)
Impact of Spin-Off			156
Accumulated gain / (loss) at end of period	$ (2)	$ 117	$ (38)

Derivative Instruments Gain Loss In Accumulated Other Comprehensive Income Related To Discontinued Operation

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- Definition

Derivative Instruments Gain Loss Reclassified From Accumulated Other Comprehensive Income Into Spin Off Dividend

+ References

No definition available.

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- Definition

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 11

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-Publisher FASB

-Name Accounting Standards Codification

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-Name Accounting Standards Codification

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-Subparagraph (d)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

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- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (c)

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

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