Allowance For Credit Losses - Lending Related Commitments (Details 1) (USD $) In Millions	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Allowance for lending-related commitments [Abstract]
Valuation allowances and reserves at beginning of period	$ 717	$ 939
Provision for lending-related commitments	(29)	(19)
Other	(2)	(29)
Valuation allowances and reserves at end of period	686	873
Allowance for lending related commitments by impairment methodology
Asset-specific	156	267
Formula-based	530	606
Allowance for lending-related commitments	686	873
Lending-related commitments by impairment methodology:
Total lending related commitments	973,093	954,082	958,709
Asset Specific [Member]
Lending-related commitments by impairment methodology:
Total lending related commitments	705	1,344
Asset Specific [Member] \| Wholesale
Lending-related commitments by impairment methodology:
Total lending related commitments	705	1,344
Asset Specific [Member] \| Consumer Excluding Credit Card
Lending-related commitments by impairment methodology:
Total lending related commitments	0	0
Asset Specific [Member] \| Credit Card
Lending-related commitments by impairment methodology:
Total lending related commitments	0	0
Formula Based [Member]
Lending-related commitments by impairment methodology:
Total lending related commitments	972,388	952,738
Formula Based [Member] \| Wholesale
Lending-related commitments by impairment methodology:
Total lending related commitments	378,977	337,268
Formula Based [Member] \| Consumer Excluding Credit Card
Lending-related commitments by impairment methodology:
Total lending related commitments	64,581	68,275
Formula Based [Member] \| Credit Card
Lending-related commitments by impairment methodology:
Total lending related commitments	528,830	547,195
Allowance for Lending Related Commitments [Member]
Allowance for lending-related commitments [Abstract]
Cumulative effect of changes in accounting principles	0	(18)
Allowance for Lending Related Commitments [Member] \| Wholesale
Allowance for lending-related commitments [Abstract]
Cumulative effect of changes in accounting principles	0	(18)
Allowance for Lending Related Commitments [Member] \| Consumer Excluding Credit Card
Allowance for lending-related commitments [Abstract]
Cumulative effect of changes in accounting principles	0	0
Allowance for Lending Related Commitments [Member] \| Credit Card
Allowance for lending-related commitments [Abstract]
Cumulative effect of changes in accounting principles	0	0
Wholesale
Allowance for lending-related commitments [Abstract]
Valuation allowances and reserves at beginning of period	711	927
Provision for lending-related commitments	(29)	(14)
Other	(2)	(29)
Valuation allowances and reserves at end of period	680	866
Allowance for lending related commitments by impairment methodology
Asset-specific	156	267
Formula-based	524	599
Allowance for lending-related commitments	680	866
Lending-related commitments by impairment methodology:
Total lending related commitments	379,682	338,612
Consumer Excluding Credit Card
Allowance for lending-related commitments [Abstract]
Valuation allowances and reserves at beginning of period	6	12
Provision for lending-related commitments	0	(5)
Other	0	0
Valuation allowances and reserves at end of period	6	7
Allowance for lending related commitments by impairment methodology
Asset-specific	0	0
Formula-based	6	7
Allowance for lending-related commitments	6	7
Lending-related commitments by impairment methodology:
Total lending related commitments	64,581	68,275
Credit Card
Allowance for lending-related commitments [Abstract]
Valuation allowances and reserves at beginning of period	0	0
Provision for lending-related commitments	0	0
Other	0	0
Valuation allowances and reserves at end of period	0	0
Allowance for lending related commitments by impairment methodology
Asset-specific	0	0
Formula-based	0	0
Allowance for lending-related commitments	0	0
Lending-related commitments by impairment methodology:
Total lending related commitments	$ 528,830	$ 547,195

Allowance For Lending Related Commitments Asset Specific.

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Allowance For Lending Related Commitments Formula Based.

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Components.

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Allowance For Lending Related Commitments.

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Lending-related commitments by impairment methodology.

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The contractual amount of off-balance sheet lending-related financial instruments (e.g., commitments and guarantees), which represents the maximum possible credit risk should the counterparty draw upon the commitment or the entity be required to fulfill its obligation under the guarantee, and the counterparty subsequently fail to perform according to the terms of the contract.

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The sum of the periodic provision charged to operations, as well as any accounting policy conformity adjustment recorded in connection with a business combination transaction, based on an assessment of the collectibility of the lending related commitments (which are conditional contracts to lend money to a client in the future under specific terms) and the offset to which is either added to or deducted from the allowance account for the purpose of adjusting the portfolio to an amount that approximates net realizable value (the amount expected to be collected).

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Amount of the cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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The provision charged to earnings in the period, the offset to which is either added to or deducted from the allowance account, for the purpose of reducing receivables, other than loans, leases, or credit losses, to an amount that approximates their net realizable value (the amount expected to be collected); includes provision for losses associated with foreclosed assets.

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Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

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