Credit Risk Concentrations (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Concentration Risk [Line Items]
Credit exposure	$ 1,862,732	$ 1,860,528
Loans	738,418	733,796
Derivative receivables balance	65,759	74,983
Off-balance sheet	1,031,672	1,027,988
Receivables from customers and other [Member]
Concentration Risk [Line Items]
Loans	26,900	23,800
Consumer
Concentration Risk [Line Items]
Credit exposure	1,002,433	1,013,900
Loans	416,854	420,613
Derivative receivables balance	0	0
Off-balance sheet	585,440	593,174
Consumer, excluding credit card [Member]
Concentration Risk [Line Items]
Credit exposure	345,259	352,889
Loans	289,063	292,620
Derivative receivables balance	0	0
Off-balance sheet	56,057	60,156
Credit card [Member]
Concentration Risk [Line Items]
Credit exposure	657,174	661,011
Loans	127,791	127,993
Derivative receivables balance	0	0
Off-balance sheet	529,383	533,018
Wholesale-related [Member]
Concentration Risk [Line Items]
Credit exposure	860,299	846,628
Loans	321,564	313,183
Derivative receivables balance	65,759	74,983
Off-balance sheet	446,232	434,814
Wholesale-related [Member] | Real Estate [Member]
Concentration Risk [Line Items]
Credit exposure	87,102	76,198
Loans	69,151	60,740
Derivative receivables balance	460	1,084
Off-balance sheet	17,491	14,374
Wholesale-related [Member] | Banks & Finance Cos [Member]
Concentration Risk [Line Items]
Credit exposure	66,881	73,318
Loans	25,482	26,651
Derivative receivables balance	18,888	19,846
Off-balance sheet	22,511	26,821
Wholesale-related [Member] | Oil & Gas [Member]
Concentration Risk [Line Items]
Credit exposure	46,934	42,563
Loans	14,383	14,704
Derivative receivables balance	2,203	2,345
Off-balance sheet	30,348	25,514
Wholesale-related [Member] | Healthcare [Member]
Concentration Risk [Line Items]
Credit exposure	45,910	48,487
Loans	13,319	11,638
Derivative receivables balance	3,202	3,359
Off-balance sheet	29,389	33,490
Wholesale-related [Member] | State & Municipal Govt [Member]
Concentration Risk [Line Items]
Credit exposure	35,666	41,821
Loans	8,708	7,998
Derivative receivables balance	3,319	5,138
Off-balance sheet	23,639	28,685
Wholesale-related [Member] | Consumer Products [Member]
Concentration Risk [Line Items]
Credit exposure	34,145	32,778
Loans	9,099	9,151
Derivative receivables balance	715	826
Off-balance sheet	24,331	22,801
Wholesale-related [Member] | Asset Managers [Member]
Concentration Risk [Line Items]
Credit exposure	33,506	31,474
Loans	5,656	6,220
Derivative receivables balance	7,175	8,390
Off-balance sheet	20,675	16,864
Wholesale-related [Member] | Utilities [Member]
Concentration Risk [Line Items]
Credit exposure	28,983	29,533
Loans	5,582	6,814
Derivative receivables balance	2,248	2,649
Off-balance sheet	21,153	20,070
Wholesale-related [Member] | Retail & Consumer Services [Member]
Concentration Risk [Line Items]
Credit exposure	25,068	25,597
Loans	7,504	7,901
Derivative receivables balance	273	429
Off-balance sheet	17,291	17,267
Wholesale-related [Member] | Technology [Member]
Concentration Risk [Line Items]
Credit exposure	21,403	18,488
Loans	4,426	3,806
Derivative receivables balance	1,392	1,192
Off-balance sheet	15,585	13,490
Wholesale-related [Member] | Central Govt [Member]
Concentration Risk [Line Items]
Credit exposure	21,049	21,223
Loans	1,754	1,333
Derivative receivables balance	9,998	11,232
Off-balance sheet	9,297	8,658
Wholesale-related [Member] | Machinery & Equipment Mfg [Member]
Concentration Risk [Line Items]
Credit exposure	19,078	18,504
Loans	5,969	6,304
Derivative receivables balance	476	592
Off-balance sheet	12,633	11,608
Wholesale-related [Member] | Metals/Mining [Member]
Concentration Risk [Line Items]
Credit exposure	17,434	20,958
Loans	5,825	6,059
Derivative receivables balance	560	624
Off-balance sheet	11,049	14,275
Wholesale-related [Member] | Business Services [Member]
Concentration Risk [Line Items]
Credit exposure	14,601	13,577
Loans	4,497	4,550
Derivative receivables balance	594	190
Off-balance sheet	9,510	8,837
Wholesale-related [Member] | Transportation [Member]
Concentration Risk [Line Items]
Credit exposure	13,975	19,827
Loans	6,845	12,763
Derivative receivables balance	621	673
Off-balance sheet	6,509	6,391
Wholesale-related [Member] | All other [Member]
Concentration Risk [Line Items]
Credit exposure	308,519	301,673
Loans	120,063	119,590
Derivative receivables balance	13,635	16,414
Off-balance sheet	174,821	165,669
Wholesale-related [Member] | Loans Retained [Member]
Concentration Risk [Line Items]
Credit exposure	820,254	816,019
Loans	308,263	306,222
Derivative receivables balance	65,759	74,983
Off-balance sheet	446,232	434,814
Wholesale-related [Member] | Loans held-for-sale and loans at fair value [Member]
Concentration Risk [Line Items]
Credit exposure	13,301	6,961
Loans	13,301	6,961
Derivative receivables balance	0	0
Off-balance sheet	0	0
Wholesale-related [Member] | Receivables from customers and other [Member]
Concentration Risk [Line Items]
Credit exposure	26,744	23,648
Loans	0	0
Derivative receivables balance	0	0
Off-balance sheet	$ 0	$ 0