Derivative Financial Instruments and Hedging Activities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	$ (78)	$ 150	$ (276)	$ 99
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	82,298		82,298		84,700
Fair Value of Derivative Assets	1,475		1,475		1,365
Fair Value of Derivative Liabilities	400		400		286
Counterparty Risk [Abstract]
Derivative asset instruments, adjustment for non-performance risk	31		31		52
Derivative liability instruments, adjustment for non-performance risk	8		8		7
Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	(84)	156	(284)	120
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	67,867		67,867		76,914
Fair Value of Derivative Assets	655		655		839
Fair Value of Derivative Liabilities	395		395		286
Interest Rate Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	(13)	(6)	(27)	(12)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	62,923		62,923		70,348
Fair Value of Derivative Assets	633		633		637
Fair Value of Derivative Liabilities	279		279		237
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	44	45	126	178
Ineffectiveness	6	(6)	8	(22)
Gain (loss) recognized in income	50	39	134	156
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	118	372	276	418
Change in fair value of hedged debt, (Gain) Loss	112	378	268	440
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	14,431		14,431		7,786
Fair Value of Derivative Assets	820		820		526
Fair Value of Derivative Liabilities	5		5		0
Foreign Exchange Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	(10)	46	(67)	45
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	2,330		2,330		3,079
Fair Value of Derivative Assets	22		22		53
Fair Value of Derivative Liabilities	33		33		37
Cross Currency Interest Rate Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	(61)	33	(109)	2
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	2,614		2,614		987
Fair Value of Derivative Assets	0		0		12
Fair Value of Derivative Liabilities	83		83		12
Other Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	0	83	(81)	85
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	0		0		2,500
Fair Value of Derivative Assets	0		0		137
Fair Value of Derivative Liabilities	$ 0		$ 0		$ 0

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Adjustment to derivative assets for non-performance risk.

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Adjustment to derivative liabilities for non-performance risk.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

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The amount recognized in earnings related to the change in fair value during the period of derivative or nonderivative instruments designated as fair value hedging instruments.

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The amount recognized in earnings related to the change in fair value during the period of the hedged item in a fair value hedge.

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Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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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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The net gain (loss) recognized in earnings during the period due to the ineffectiveness on interest rate fair value hedges.

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