Derivative Financial Instruments (Details 1) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Derivatives, Fair Value [Line Items]
Notional Amount	$ 278,891	$ 254,253
Estimated Fair Value Assets	16,284	7,777
Estimated Fair Value Liabilities	3,959	4,747
Interest rate swaps [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Fair Value Hedges [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	5,155	5,108
Estimated Fair Value Assets	1,830	823
Estimated Fair Value Liabilities	104	169
Interest rate swaps [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Cash Flow Hedges [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	3,380	3,562
Estimated Fair Value Assets	918	102
Estimated Fair Value Liabilities	0	116
Interest rate forwards [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Cash Flow Hedges [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	1,010	1,140
Estimated Fair Value Assets	204	0
Estimated Fair Value Liabilities	0	107
Foreign currency swaps [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Fair Value Hedges [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	3,241	4,524
Estimated Fair Value Assets	535	907
Estimated Fair Value Liabilities	97	145
Foreign currency swaps [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Cash Flow Hedges [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	6,428	5,556
Estimated Fair Value Assets	420	213
Estimated Fair Value Liabilities	282	347
Foreign currency forwards [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Foreign Operations Hedges [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	1,915	1,935
Estimated Fair Value Assets	147	9
Estimated Fair Value Liabilities	1	26
Non-derivative hedging instruments [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Foreign Operations Hedges [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	0	169
Estimated Fair Value Assets	0	0
Estimated Fair Value Liabilities	0	185
Credit forwards [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Cash Flow Hedges [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	20	90
Estimated Fair Value Assets	3	2
Estimated Fair Value Liabilities	0	3
Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	21,149	22,084
Estimated Fair Value Assets	4,057	2,056
Estimated Fair Value Liabilities	484	1,098
Derivatives Designated as Hedging Instruments [Member] \| Fair Value Hedges [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	8,396	9,632
Estimated Fair Value Assets	2,365	1,730
Estimated Fair Value Liabilities	201	314
Derivatives Designated as Hedging Instruments [Member] \| Cash Flow Hedges [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	10,838	10,348
Estimated Fair Value Assets	1,545	317
Estimated Fair Value Liabilities	282	573
Derivatives Designated as Hedging Instruments [Member] \| Foreign Operations Hedges [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	1,915	2,104
Estimated Fair Value Assets	147	9
Estimated Fair Value Liabilities	$ 1	$ 211

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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph a

-Clause 1

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

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.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Aggregate notional amount of all derivatives. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

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