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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, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated gain / (loss) at beginning of period	$ 82		$ 117	$ (38)
Transfer of realized losses / (gains) in fair value to earnings	(2)	15	(3)	32
Unrealized gain / (loss) in fair value	(36)	57	(70)	78
Accumulated gain / (loss) at end of period	$ 44	$ 72	$ 44	$ 72

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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