Derivative Financial Instruments and Hedging Activities (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	$ (352)	$ 33	$ 64
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	90,369	84,700
Fair Value of Derivative Assets	1,256	1,365
Fair Value of Derivative Liabilities	400	286
Counterparty Risk [Abstract]
Derivative asset instruments, adjustment for non-performance risk	14	52
Derivative liability instruments, adjustment for non-performance risk	5	7
Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	(368)	65	80
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	73,615	76,914
Fair Value of Derivative Assets	469	839
Fair Value of Derivative Liabilities	392	286
Interest Rate Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	(33)	(25)	20
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	68,622	70,348
Fair Value of Derivative Assets	460	637
Fair Value of Derivative Liabilities	248	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	177	217	225
Ineffectiveness	16	(30)	(6)
Gain (loss) recognized in income	193	187	219
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	228	433	117
Change in fair value of hedged debt, loss	212	463	123
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	16,754	7,786
Fair Value of Derivative Assets	787	526
Fair Value of Derivative Liabilities	8	0
Foreign Exchange Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	(104)	28	61
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	1,987	3,079
Fair Value of Derivative Assets	9	53
Fair Value of Derivative Liabilities	27	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	(150)	(3)	(1)
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	3,006	987
Fair Value of Derivative Assets	0	12
Fair Value of Derivative Liabilities	117	12
Other Contract [Member] \| Not Designated as Hedging Instrument [Member]
Income Effect of Derivative Financial Instruments [Abstract]
Gain (loss) recognized in income	(81)	65	0
Balance Sheet Effect of Derivative Financial Instruments [Abstract]
Notional	0	2,500
Fair Value of Derivative Assets	0	137
Fair Value of Derivative Liabilities	$ 0	$ 0

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- Definition

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

-Sentence Column B

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- Definition

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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- Definition

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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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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- Definition

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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- Definition

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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