Derivative Financial Instruments and Hedging Activities (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Effect of Derivative Financial Instruments [Abstract]
Derivative, Gain (Loss) on Derivative, Net	$ 481	$ 512	$ 106
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	96,452	83,713
Fair Value of Derivative Assets	924	859
Fair Value of Derivative Liabilities	243	167
Counterparty Risk [Abstract]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	(167)	(136)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	(167)	(136)
Derivative Asset	757	723
Derivative Liability	76	31
Interest Rate Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Derivative, Gain (Loss) on Derivative, Net	(58)	(41)	(28)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	62,638	56,558
Fair Value of Derivative Assets	159	168
Fair Value of Derivative Liabilities	112	89
Interest Rate Contract [Member] \| Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Net interest settlements and accruals excluded from the assessment of hedge effectiveness	370	304	254
Ineffectiveness	3	20	(44)
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	72	407	(658)
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(69)	(387)	614
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	28,964	23,203
Fair Value of Derivative Assets	670	602
Fair Value of Derivative Liabilities	16	38
Foreign Exchange Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Derivative, Gain (Loss) on Derivative, Net	66	68	12
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	1,713	1,527
Fair Value of Derivative Assets	22	18
Fair Value of Derivative Liabilities	4	1
Cross Currency Interest Rate Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Derivative, Gain (Loss) on Derivative, Net	100	161	(88)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	3,137	2,425
Fair Value of Derivative Assets	73	71
Fair Value of Derivative Liabilities	111	39
Affiliated Entity [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Gains/(Losses) from derivative transactions	$ 66	$ 68	$ 10

Balance Sheet Effect of Derivative Financial Instruments [Abstract]

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Counterparty Risk [Abstract]

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Income Effect of Derivative Financial Instruments [Abstract]

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The related party amount of net gains and losses recognized in income during the period on derivative instruments not designated as hedging instruments.

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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-Publisher SEC
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Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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The net gain (loss) included in earnings for the period relating to components of the gain (loss) on interest rate fair value hedging instruments excluded from the assessment of fair value hedge effectiveness.

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