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Schedule of Cash Flow Hedges Effect on Accumulated Other Comprehensive Income, Net of Taxes (Detail) - Cash Flow Hedges - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated gain / (loss) at beginning of period	$ (53)	$ 44	$ (2)	$ 117
Transfer of realized losses / (gains) in fair value to earnings	60	(17)	6	(20)
Unrealized gain / (loss) in fair value	(69)	47	(66)	(23)
Accumulated gain / (loss) at end of period	$ (62)	$ 74	$ (62)	$ 74

X

- 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.

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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.

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

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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.

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