Financial Instruments (Derivatives and hedging) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Notional Amount of Derivatives	$ 337,000
Percentage Of Notional Amount That Is Associated With Reducing Or Eliminating Interest Rate, Currency, Or Market Risk	89.00%
Netting adjustment of derivative gross asset	(2,975)	(3,294)
Netting adjustment of derivative gross liability	(2,954)	(3,281)
Cash collateral assets	(3,185)	(2,310)
Cash collateral liabilities	(447)	(1,027)
Derivative asset, fair value	5,875	10,041
Derivative liability, fair value	509	729
Cumulative gain (loss) adjustment for non performance risk	21	13
Excess Collateralization	13	579
Securities Held as Collateral, at Fair Value	9,970
Derivatives Accounted For As Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	9,163	13,197
Derivative liabilities	2,709	3,385
Derivatives Not Accounted For As Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	2,872	2,448
Derivative liabilities	1,201	1,652
Derivatives Associated With Interest Rate, Currency Or Market Risk Reduction Or Elimination [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Derivatives	300,000
Interest Rate Contract [Member] \| Derivatives Accounted For As Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	7,751	9,446
Derivative liabilities	1,130	1,049
Interest Rate Contract [Member] \| Derivatives Not Accounted For As Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	439	319
Derivative liabilities	190	241
Foreign Exchange Contract [Member] \| Derivatives Accounted For As Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	1,411	3,750
Derivative liabilities	1,577	2,325
Foreign Exchange Contract [Member] \| Derivatives Not Accounted For As Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	1,967	1,748
Derivative liabilities	923	1,274
Other Contract [Member] \| Derivatives Accounted For As Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	1	1
Derivative liabilities	2	11
Other Contract [Member] \| Derivatives Not Accounted For As Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	466	381
Derivative liabilities	$ 88	$ 137

Fair value of cash collateral assets received from counterparties

No definition available.

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- Definition

Fair value of cash collateral liability received from counterparties

+ References

No definition available.

+ Details

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- Definition

This item represents the cumulative gain or loss adjustment for non-performance risk included in fair value of derivatives.

+ References

No definition available.

+ Details

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- Definition

Derivative Fair Value Of Derivative Assets Net Of Master Netting Agreement

+ References

No definition available.

+ Details

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- Definition

Derivative Fair Value Of Derivative Liability, Net Of Master Netting Agreement

+ References

No definition available.

+ Details

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- Definition

The amount of excess cash collateralization posted for derivatives.

+ References

No definition available.

+ Details

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- Definition

This item represents the impact of netting across all derivative types which reflects the impact of legally enforceable master netting agreements to settle positive and negative positions, and the cumulative adjustment for non-performance risk.

+ References

No definition available.

+ Details

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- Definition

+ References

No definition available.

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- Definition

Percentage Of Notional Amount That Is Associated With Reducing Or Eliminating Interest Rate, Currency, Or Market Risk between Financial Assets and Liabilities in the Financial Services businesses

+ References

No definition available.

+ Details

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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.

+ References

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

+ Details

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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

+ Details

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- Definition

The carrying amount (fair value) as of the balance sheet date of securities held that had been pledged by counterparties under financing and lending arrangements, pursuant to which the entity has the right by agreement or custom to sell or re-pledge such securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5086-111524

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