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Derivatives and Hedging Activities - After-Tax Change in AOCI Resulting from Cash Flow Hedges (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
December 31, 2014	$ (8)
2015 Hedging Activity	45
Reclassification of Gains to Net Income	(13)
March 31, 2015	$ 24

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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