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Derivative Financial Instruments - Summary of Activity in Other Comprehensive Income Related to Derivative Instruments Classified as Cash Flow Hedges and as a Net Investment Hedge (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income Derivatives Qualifying as Hedges, Net of Tax [Roll Forward]
Accumulated gain included in other comprehensive income (loss) at beginning of the period	$ (1,219)
Increase (decrease) in fair value of derivatives that qualify for hedge accounting, net of tax	(64)	$ (173)
Accumulated gain included in other comprehensive income (loss) at end of the period	(1,285)
Accumulated net gain (loss) from cash flow hedges
Accumulated Other Comprehensive Income Derivatives Qualifying as Hedges, Net of Tax [Roll Forward]
Accumulated gain included in other comprehensive income (loss) at beginning of the period	86	37
Increase (decrease) in fair value of derivatives that qualify for hedge accounting, net of tax	(5)	42
Accumulated gain included in other comprehensive income (loss) at end of the period	$ 81	$ 79

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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