Allowance for Credit Losses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Loan and Lease Losses [Roll Forward]
Provision for credit losses		$ 3,139	$ 225	$ 3,385
Loans by Impairment Methodology [Abstract]
Asset-specific	14,686	14,686	17,745	20,175
Formula-based	686,122	686,122	653,371	646,904
Purchased credit-impaired	46,700	46,700	53,061	59,756
Retained loans	747,508	747,508	724,177	726,835
Lending-related commitments by impairment methodology
Asset-specific	103	103	206	355
Formula-based	1,056,069	1,056,069	1,031,466	1,027,633
Total lending-related commitments	1,056,172	1,056,172	1,031,672	1,027,988
Impaired collateral-dependent loans
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for Loan and Lease Losses Write-offs, Net		154	272	1,050
Impaired Collateral Dependent Loans [Abstract]
Loans measured at fair value of collateral less cost to sell	3,351	3,351	3,467	3,717
Allowance for loan losses
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, beginning balance		16,264	21,936	27,609
Gross charge-offs		6,114	7,467	10,906
Gross (recoveries)		(1,355)	(1,665)	(1,843)
Allowance for Loan and Lease Losses Write-offs, Net		4,759	5,802	9,063
Provision for credit losses		3,224	188	3,387
Other		(11)	(5)	3
Allowance for credit losses, ending balance	14,185	14,185	16,264	21,936
Allowance For Lending Related Commitments, by Impairment Methodology [Abstract]
Asset-specific, allowance	1,126	1,126	1,753	2,729
Formula-based	9,734	9,734	10,353	13,496
Purchased Credit Impaired	3,325	3,325	4,158	5,711
Total allowance for loan losses	14,185	14,185	16,264	21,936
Allowance for loan losses \| Purchased Credit-Impaired
Allowance for Loan and Lease Losses [Roll Forward]
Gross charge-offs		533	53	0
Allowance for lending-related commitments
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, beginning balance		705	668	673
Provision for credit losses		(85)	37	(2)
Other		2	0	(3)
Allowance for credit losses, ending balance	622	622	705	668
Allowance For Lending Related Commitments, by Impairment Methodology [Abstract]
Allowance for Lending-Related Commitments, Evaluated at Asset-Specific Impairment Methodology	60	60	60	97
Allowance for Lending-Related Commitments, Evaluated at Formula-Based Impairment Methodology	562	562	645	571
Total allowance for loan losses	622	622	705	668
Consumer, excluding credit card
Loans by Impairment Methodology [Abstract]
Asset-specific	12,020	12,020	13,785	13,938
Formula-based	236,263	236,263	221,609	218,945
Purchased credit-impaired	46,696	46,696	53,055	59,737
Retained loans	294,979	294,979	288,449	292,620
Lending-related commitments by impairment methodology
Asset-specific	0	0	0	0
Formula-based	58,153	58,153	56,057	60,156
Total lending-related commitments	58,153	58,153	56,057	60,156
Consumer, excluding credit card \| Purchased Credit-Impaired
Loans by Impairment Methodology [Abstract]
Retained loans	46,696	46,696	53,055
Consumer, excluding credit card \| Impaired collateral-dependent loans
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for Loan and Lease Losses Write-offs, Net		133	235	973
Impaired Collateral Dependent Loans [Abstract]
Loans measured at fair value of collateral less cost to sell	3,025	3,025	3,105	3,272
Consumer, excluding credit card \| Allowance for loan losses
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, beginning balance		8,456	12,292	16,294
Gross charge-offs		2,132	2,754	4,805
Gross (recoveries)		(814)	(847)	(508)
Allowance for Loan and Lease Losses Write-offs, Net		1,318	1,907	4,297
Provision for credit losses		414	(1,872)	302
Other		31	(4)	(7)
Allowance for credit losses, ending balance	7,050	7,050	8,456	12,292
Allowance For Lending Related Commitments, by Impairment Methodology [Abstract]
Asset-specific, allowance	539	539	601	729
Formula-based	3,186	3,186	3,697	5,852
Purchased Credit Impaired	3,325	3,325	4,158	5,711
Total allowance for loan losses	7,050	7,050	8,456	12,292
Consumer, excluding credit card \| Allowance for loan losses \| Purchased Credit-Impaired
Allowance for Loan and Lease Losses [Roll Forward]
Gross charge-offs	291	533	53	0
Consumer, excluding credit card \| Allowance for lending-related commitments
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, beginning balance		8	7	7
Provision for credit losses		5	1	0
Other		0	0	0
Allowance for credit losses, ending balance	13	13	8	7
Allowance For Lending Related Commitments, by Impairment Methodology [Abstract]
Allowance for Lending-Related Commitments, Evaluated at Asset-Specific Impairment Methodology	0	0	0	0
Allowance for Lending-Related Commitments, Evaluated at Formula-Based Impairment Methodology	13	13	8	7
Total allowance for loan losses	13	13	8	7
Credit card
Loans by Impairment Methodology [Abstract]
Asset-specific	2,029	2,029	3,115	4,762
Formula-based	125,998	125,998	124,350	123,231
Purchased credit-impaired	0	0	0	0
Retained loans	128,027	128,027	127,465	127,993
Lending-related commitments by impairment methodology
Asset-specific	0	0	0	0
Formula-based	525,963	525,963	529,383	533,018
Total lending-related commitments	525,963	525,963	529,383	533,018
Credit card \| Impaired collateral-dependent loans
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for Loan and Lease Losses Write-offs, Net		0	0	0
Impaired Collateral Dependent Loans [Abstract]
Loans measured at fair value of collateral less cost to sell	0	0	0	0
Credit card \| Allowance for loan losses
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, beginning balance		3,795	5,501	6,999
Gross charge-offs		3,831	4,472	5,755
Gross (recoveries)		(402)	(593)	(811)
Allowance for Loan and Lease Losses Write-offs, Net		3,429	3,879	4,944
Provision for credit losses		3,079	2,179	3,444
Other		(6)	(6)	2
Allowance for credit losses, ending balance	3,439	3,439	3,795	5,501
Allowance For Lending Related Commitments, by Impairment Methodology [Abstract]
Asset-specific, allowance	500	500	971	1,681
Formula-based	2,939	2,939	2,824	3,820
Purchased Credit Impaired	0	0	0	0
Total allowance for loan losses	3,439	3,439	3,795	5,501
Credit card \| Allowance for loan losses \| Purchased Credit-Impaired
Allowance for Loan and Lease Losses [Roll Forward]
Gross charge-offs		0	0	0
Credit card \| Allowance for lending-related commitments
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, beginning balance		0	0	0
Provision for credit losses		0	0	0
Other		0	0	0
Allowance for credit losses, ending balance	0	0	0	0
Allowance For Lending Related Commitments, by Impairment Methodology [Abstract]
Allowance for Lending-Related Commitments, Evaluated at Asset-Specific Impairment Methodology	0	0	0	0
Allowance for Lending-Related Commitments, Evaluated at Formula-Based Impairment Methodology	0	0	0	0
Total allowance for loan losses	0	0	0	0
Wholesale
Loans by Impairment Methodology [Abstract]
Asset-specific	637	637	845	1,475
Formula-based	323,861	323,861	307,412	304,728
Purchased credit-impaired	4	4	6	19
Retained loans	324,502	324,502	308,263	306,222
Lending-related commitments by impairment methodology
Asset-specific	103	103	206	355
Formula-based	471,953	471,953	446,026	434,459
Total lending-related commitments	472,056	472,056	446,232	434,814
Wholesale \| Impaired collateral-dependent loans
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for Loan and Lease Losses Write-offs, Net		21	37	77
Impaired Collateral Dependent Loans [Abstract]
Loans measured at fair value of collateral less cost to sell	326	326	362	445
Wholesale \| Allowance for loan losses
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, beginning balance		4,013	4,143	4,316
Gross charge-offs		151	241	346
Gross (recoveries)		(139)	(225)	(524)
Allowance for Loan and Lease Losses Write-offs, Net		12	16	(178)
Provision for credit losses		(269)	(119)	(359)
Other		(36)	5	8
Allowance for credit losses, ending balance	3,696	3,696	4,013	4,143
Allowance For Lending Related Commitments, by Impairment Methodology [Abstract]
Asset-specific, allowance	87	87	181	319
Formula-based	3,609	3,609	3,832	3,824
Purchased Credit Impaired	0	0	0	0
Total allowance for loan losses	3,696	3,696	4,013	4,143
Wholesale \| Allowance for loan losses \| Purchased Credit-Impaired
Allowance for Loan and Lease Losses [Roll Forward]
Gross charge-offs		0	0	0
Wholesale \| Allowance for lending-related commitments
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses, beginning balance		697	661	666
Provision for credit losses		(90)	36	(2)
Other		2	0	(3)
Allowance for credit losses, ending balance	609	609	697	661
Allowance For Lending Related Commitments, by Impairment Methodology [Abstract]
Allowance for Lending-Related Commitments, Evaluated at Asset-Specific Impairment Methodology	60	60	60	97
Allowance for Lending-Related Commitments, Evaluated at Formula-Based Impairment Methodology	549	549	637	564
Total allowance for loan losses	$ 609	$ 609	$ 697	$ 661

The asset specific allowance for lending related commitments.

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The allowance for lending-related commitments, evaluated at formula-based impairment methodlogy.

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Reflects the carrying amount of impaired collateral dependent loans at fair value less cost to sell.

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Originated or purchased loans held-for-investment, other than PCI loans, are measured at the principal amount outstanding, net of the following: allowance for loan losses; net charge-offs; interest applied to principal (for loans accounted for on the cost recovery method); unamortized discounts and premiums; and net deferred loan fees or costs.

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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 contractual amount of off-balance sheet lending-related financial instruments (e.g., commitments and guarantees that were individually evaluated when determining the allowance for credit losses.

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The contractual amount of off-balance sheet lending-related financial instruments (e.g., commitments and guarantees that were collectively evaluated when determining the allowance for credit losses.

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Amount of other addition (reduction) in allowance reserve for credit loss.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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Amount, after recoveries, of loans and leases that have been written-off.

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The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to consumer loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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For loans and debt securities, 1) for which at acquisition it was probable that the investor would be unable to collect all contractually required payments receivable, and 2) for which it is further probable that the investor will not be able to collect all cash flows expected at acquisition (plus any additional cash flows expected due to changes in estimate after acquisition), the allowance for credit losses recorded to reflect the impairment since acquisition.

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A valuation allowance for financing receivables that are expected to be uncollectible.

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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The balance of financing receivables that were collectively evaluated for impairment.

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The balance of financing receivables that were individually evaluated for impairment.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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Total of recoveries of amounts due the Entity that had previously been written off as uncollectible using allowances (the valuation accounts that are netted against the cost of an asset to value it at its carrying value) and total of reestablishments of reserves (liabilities established to represent expected future costs) that had previously been utilized.

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