Fair Value, Assets and Liabilities Measured on Recurring Basis Level 3 Reconciliation (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Available for sale Securities [Member]
Assets:
Balance, beginning of period	$ 21,208	$ 21,076	$ 21,958	$ 22,773
Net income	195	82	310	177
Net gains included in other comprehensive income	(28)	160	295	236
Purchases, sales, issuances and settlements, net	2,066	810	855	2,399
Transfers into Level 3	43	337	109	1,618
Transfers out of Level 3	(566)	(696)	(609)	(5,434)
Balance, end of period	22,918	21,769	22,918	21,769
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	(23)	(4)	(25)	(21)
Available for sale Securities [Member] | Debt Securities [Member]
Assets:
Balance, beginning of period	19,184	18,097	19,492	20,380
Net income	124	24	171	111
Net gains included in other comprehensive income	(21)	174	296	262
Purchases, sales, issuances and settlements, net	2,573	1,176	1,878	2,140
Transfers into Level 3	43	337	109	1,618
Transfers out of Level 3	(566)	(684)	(609)	(5,387)
Balance, end of period	21,337	19,124	21,337	19,124
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	(23)	(4)	(25)	(21)
Available for sale Securities [Member] | US States and Political Subdivisions [Member]
Assets:
Balance, beginning of period	5,030	2,871	4,564	818
Net income	3	3	5	4
Net gains included in other comprehensive income	(20)	32	49	94
Purchases, sales, issuances and settlements, net	1,682	(170)	2,077	1,798
Transfers into Level 3	0	0	0	28
Transfers out of Level 3	0	0	0	(6)
Balance, end of period	6,695	2,736	6,695	2,736
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	(9)	4	(7)	4
Available for sale Securities [Member] | Mortgage Backed Securities [Member]
Assets:
Balance, beginning of period	291	909	237	2,883
Net income	1	(17)	(7)	(24)
Net gains included in other comprehensive income	(10)	346	59	358
Purchases, sales, issuances and settlements, net	12	18	16	(21)
Transfers into Level 3	1	210	7	453
Transfers out of Level 3	(7)	(216)	(24)	(2,399)
Balance, end of period	288	1,250	288	1,250
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	(5)	0	(8)	(8)
Available for sale Securities [Member] | Residential [Member]
Assets:
Balance, beginning of period	10	406	20	1,084
Net income	(3)	0	(3)	(7)
Net gains included in other comprehensive income	2	(22)	1	(15)
Purchases, sales, issuances and settlements, net	(1)	26	1	(14)
Transfers into Level 3	1	82	7	266
Transfers out of Level 3	(3)	(139)	(20)	(961)
Balance, end of period	6	353	6	353
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	(3)	0	(4)	(4)
Available for sale Securities [Member] | Commercial [Member]
Assets:
Balance, beginning of period	281	503	217	1,799
Net income	4	(17)	(4)	(17)
Net gains included in other comprehensive income	(12)	368	58	373
Purchases, sales, issuances and settlements, net	13	(8)	15	(7)
Transfers into Level 3	0	128	0	187
Transfers out of Level 3	(4)	(77)	(4)	(1,438)
Balance, end of period	282	897	282	897
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	(2)	0	(4)	(4)
Available for sale Securities [Member] | Collateralized debt obligations [Member]
Assets:
Balance, beginning of period	5,616	3,851	4,778	3,725
Net income	84	40	137	79
Net gains included in other comprehensive income	(12)	(114)	141	(38)
Purchases, sales, issuances and settlements, net	1,536	254	2,168	477
Transfers into Level 3	8	0	8	0
Transfers out of Level 3	0	0	0	(212)
Balance, end of period	7,232	4,031	7,232	4,031
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	0	(5)	0	(10)
Available for sale Securities [Member] | Corporate debt securities [Member]
Assets:
Balance, beginning of period	494	503	433	367
Net income	37	3	39	4
Net gains included in other comprehensive income	29	(2)	38	42
Purchases, sales, issuances and settlements, net	(48)	(44)	1	(50)
Transfers into Level 3	5	28	6	166
Transfers out of Level 3	0	(108)	0	(149)
Balance, end of period	517	380	517	380
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	0	0	0	0
Available for sale Securities [Member] | Total asset-backed securities [Member]
Assets:
Balance, beginning of period	7,753	9,884	9,395	12,510
Net income	(1)	(5)	(3)	48
Net gains included in other comprehensive income	(8)	(90)	9	(193)
Purchases, sales, issuances and settlements, net	(609)	1,111	(2,299)	(76)
Transfers into Level 3	29	99	88	971
Transfers out of Level 3	(559)	(360)	(585)	(2,621)
Balance, end of period	6,605	10,639	6,605	10,639
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	(9)	(3)	(10)	(7)
Available for sale Securities [Member] | Auto loans and leases [Member]
Assets:
Balance, beginning of period	4,244	7,587	6,133	8,525
Net income	1	0	2	0
Net gains included in other comprehensive income	4	(56)	(35)	(123)
Purchases, sales, issuances and settlements, net	(349)	(428)	(2,200)	(1,477)
Transfers into Level 3	0	1	0	179
Transfers out of Level 3	0	0	0	0
Balance, end of period	3,900	7,104	3,900	7,104
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	0	0	0	0
Available for sale Securities [Member] | Home Equity Loans [Member]
Assets:
Balance, beginning of period	98	107	112	1,677
Net income	(5)	1	(3)	0
Net gains included in other comprehensive income	(5)	5	(4)	12
Purchases, sales, issuances and settlements, net	(1)	(1)	(2)	(2)
Transfers into Level 3	29	98	39	113
Transfers out of Level 3	(40)	(16)	(66)	(1,606)
Balance, end of period	76	194	76	194
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	(9)	(2)	(10)	(5)
Available for sale Securities [Member] | Other asset-backed securities [Member]
Assets:
Balance, beginning of period	3,411	2,190	3,150	2,308
Net income	3	(6)	(2)	48
Net gains included in other comprehensive income	(7)	(39)	48	(82)
Purchases, sales, issuances and settlements, net	(259)	1,540	(97)	1,403
Transfers into Level 3	0	0	49	679
Transfers out of Level 3	(519)	(344)	(519)	(1,015)
Balance, end of period	2,629	3,341	2,629	3,341
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	0	(1)	0	(2)
Available for sale Securities [Member] | Other Debt Securities, Excluding Asset Backed Securities [Member]
Assets:
Balance, beginning of period		79	85	77
Net income		0	0	0
Net gains included in other comprehensive income		2	0	(1)
Purchases, sales, issuances and settlements, net		7	(85)	12
Transfers into Level 3		0	0	0
Transfers out of Level 3		0	0	0
Balance, end of period	0	88	0	88
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end		0	0	0
Available for sale Securities [Member] | Equity Securities [Member]
Assets:
Balance, beginning of period	2,024	2,979	2,466	2,393
Net income	71	58	139	66
Net gains included in other comprehensive income	(7)	(14)	(1)	(26)
Purchases, sales, issuances and settlements, net	(507)	(366)	(1,023)	259
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	(12)	0	(47)
Balance, end of period	1,581	2,645	1,581	2,645
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	0	0	0	0
Available for sale Securities [Member] | Perpetual preferred securities [Member]
Assets:
Balance, beginning of period	1,989	2,967	2,434	2,305
Net income	71	58	139	66
Net gains included in other comprehensive income	(8)	(14)	(2)	(26)
Purchases, sales, issuances and settlements, net	(507)	(381)	(1,026)	297
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	(1)	0	(13)
Balance, end of period	1,545	2,629	1,545	2,629
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	0	0	0	0
Available for sale Securities [Member] | Other equity securities [Member]
Assets:
Balance, beginning of period	35	12	32	88
Net income	0	0	0	0
Net gains included in other comprehensive income	1	0	1	0
Purchases, sales, issuances and settlements, net	0	15	3	(38)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	(11)	0	(34)
Balance, end of period	36	16	36	16
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	0	0	0	0
Trading Securities [Member]
Assets:
Balance, beginning of period	2,565	2,634	2,603	2,040
Net income	22	63	48	438
Net gains included in other comprehensive income	0	0	0	0
Purchases, sales, issuances and settlements, net	(114)	(232)	(110)	163
Transfers into Level 3	3	0	46	21
Transfers out of Level 3	(29)	(139)	(140)	(336)
Balance, end of period	2,447	2,326	2,447	2,326
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	(3)	34	1	58
Trading Securities [Member] | US States and Political Subdivisions [Member]
Assets:
Balance, beginning of period	130	12	5	5
Net income	3	5	5	7
Net gains included in other comprehensive income	0	0	0	0
Purchases, sales, issuances and settlements, net	2	(5)	87	(9)
Transfers into Level 3	0	0	38	9
Transfers out of Level 3	0	0	0	0
Balance, end of period	135	12	135	12
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	0	6	1	7
Trading Securities [Member] | Mortgage Backed Securities [Member]
Assets:
Balance, beginning of period	144	141	117	146
Net income	0	7	5	9
Net gains included in other comprehensive income	0	0	0	0
Purchases, sales, issuances and settlements, net	83	(37)	101	79
Transfers into Level 3	3	0	7	0
Transfers out of Level 3	(7)	0	(7)	(123)
Balance, end of period	223	111	223	111
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	0	2	0	2
Trading Securities [Member] | Collateralized debt obligations [Member]
Assets:
Balance, beginning of period	1,910	1,889	1,915	1,133
Net income	(10)	31	3	382
Net gains included in other comprehensive income	0	0	0	0
Purchases, sales, issuances and settlements, net	(88)	(153)	(105)	252
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	(11)	0	(12)	0
Balance, end of period	1,801	1,767	1,801	1,767
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	(33)	2	(37)	16
Trading Securities [Member] | Corporate debt securities [Member]
Assets:
Balance, beginning of period	97	276	166	223
Net income	1	6	(1)	13
Net gains included in other comprehensive income	0	0	0	0
Purchases, sales, issuances and settlements, net	5	22	(62)	62
Transfers into Level 3	0	0	0	9
Transfers out of Level 3	0	(139)	0	(142)
Balance, end of period	103	165	103	165
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	1	22	1	23
Trading Securities [Member] | Total asset-backed securities [Member]
Assets:
Balance, beginning of period	252	249	366	497
Net income	27	13	36	25
Net gains included in other comprehensive income	0	0	0	0
Purchases, sales, issuances and settlements, net	(87)	(43)	(100)	(233)
Transfers into Level 3	0	0	0	1
Transfers out of Level 3	(11)	0	(121)	(71)
Balance, end of period	181	219	181	219
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	30	2	39	10
Trading Securities [Member] | Equity Securities [Member]
Assets:
Balance, beginning of period	32	67	34	36
Net income	1	1	0	2
Net gains included in other comprehensive income	0	0	0	0
Purchases, sales, issuances and settlements, net	(29)	(16)	(31)	12
Transfers into Level 3	0	0	1	2
Transfers out of Level 3	0	0	0	0
Balance, end of period	4	52	4	52
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	(1)	0	(3)	0
Trading assets (excluding derivatives) [Member]
Assets:
Balance, beginning of period	2,709	2,808	2,739	2,311
Net income	23	42	55	402
Net gains included in other comprehensive income	0	0	0	0
Purchases, sales, issuances and settlements, net	(115)	(236)	(109)	159
Transfers into Level 3	3	0	46	21
Transfers out of Level 3	(29)	(139)	(140)	(418)
Balance, end of period	2,591	2,475	2,591	2,475
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	6	40	27	47
Trading assets (excluding derivatives) [Member] | Other Trading Assets [Member]
Assets:
Balance, beginning of period	144	174	136	271
Net income	1	(21)	7	(36)
Net gains included in other comprehensive income	0	0	0	0
Purchases, sales, issuances and settlements, net	(1)	(4)	1	(4)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	(82)
Balance, end of period	144	149	144	149
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	9	6	26	(11)
Mortgages held for sale [Member]
Assets:
Balance, beginning of period	3,314	3,338	3,305	3,523
Net income	41	(17)	9	(15)
Net gains included in other comprehensive income	0	0	0	0
Purchases, sales, issuances and settlements, net	4	(89)	46	(251)
Transfers into Level 3	77	104	149	203
Transfers out of Level 3	(76)	(76)	(149)	(200)
Balance, end of period	3,360	3,260	3,360	3,260
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	40	(16)	13	(17)
Loans [Member]
Assets:
Balance, beginning of period	98	371	309	0
Net income	3	8	13	52
Net gains included in other comprehensive income	0	0	0	0
Purchases, sales, issuances and settlements, net	(101)	(12)	(322)	(51)
Transfers into Level 3	0	0	0	366
Transfers out of Level 3	0	0	0	0
Balance, end of period	0	367	0	367
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	0	7	0	52
Mortgage servicing rights [Member]
Assets:
Balance, beginning of period	15,648	15,544	14,467	16,004
Net income	(1,610)	(3,237)	(1,691)	(4,633)
Net gains included in other comprehensive income	0	0	0	0
Purchases, sales, issuances and settlements, net	740	944	2,002	1,998
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	(118)
Balance, end of period	14,778	13,251	14,778	13,251
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	(1,075)	(2,661)	(576)	(3,438)
Foreign Exchange Contract [Member] | Derivatives [Member]
Assets and Liabilities:
Balance, beginning of year	23	4	9	(1)
Net income	6	(8)	27	(3)
Net gains included in other comprehensive income	0	0	0	0
Purchases, sales, issuances and settlements, net	(4)	2	(11)	2
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance, end of period	25	(2)	25	(2)
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	2	0	12	0
Interest Rate Contract [Member] | Derivatives [Member]
Assets and Liabilities:
Balance, beginning of year	299	257	77	(114)
Net income	884	1,685	1,290	2,673
Net gains included in other comprehensive income	0	0	0	0
Purchases, sales, issuances and settlements, net	(944)	(1,299)	(1,129)	(1,916)
Transfers into Level 3	0	0	1	0
Transfers out of Level 3	1	0	1	0
Balance, end of period	240	643	240	643
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	(147)	407	(197)	426
Equity Contract [Member] | Derivatives [Member]
Assets and Liabilities:
Balance, beginning of year	(225)	(281)	(225)	(344)
Net income	46	(87)	46	(7)
Net gains included in other comprehensive income	0	0	0	0
Purchases, sales, issuances and settlements, net	5	122	11	142
Transfers into Level 3	(4)	30	(4)	2
Transfers out of Level 3	(8)	(16)	(14)	(25)
Balance, end of period	(186)	(232)	(186)	(232)
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	6	0	35	29
Commodity Contract [Member] | Derivatives [Member]
Assets and Liabilities:
Balance, beginning of year	(3)		(1)
Net income	0		0
Net gains included in other comprehensive income	0		0
Purchases, sales, issuances and settlements, net	0		1
Transfers into Level 3	0		(3)
Transfers out of Level 3	1		1
Balance, end of period	(2)		(2)
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	0		0
Credit Contract [Member] | Derivatives [Member]
Assets and Liabilities:
Balance, beginning of year	(1,151)	(758)	(1,017)	(330)
Net income	128	(202)	42	(692)
Net gains included in other comprehensive income	0	0	0	0
Purchases, sales, issuances and settlements, net	(80)	(33)	(128)	23
Transfers into Level 3	0	0	0	6
Transfers out of Level 3	(2)	0	(2)	0
Balance, end of period	(1,105)	(993)	(1,105)	(993)
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	(70)	(178)	(99)	(671)
Other Contract [Member] | Derivatives [Member]
Assets and Liabilities:
Balance, beginning of year	(18)	(30)	(35)	(43)
Net income	(16)	(78)	1	(65)
Net gains included in other comprehensive income	0	0	0	0
Purchases, sales, issuances and settlements, net	1	5	1	5
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance, end of period	(33)	(103)	(33)	(103)
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	0	0	0	0
Derivatives [Member]
Assets and Liabilities:
Balance, beginning of year	(1,075)	(808)	(1,192)	(832)
Net income	1,048	1,310	1,406	1,906
Net gains included in other comprehensive income	0	0	0	0
Purchases, sales, issuances and settlements, net	(1,022)	(1,203)	(1,255)	(1,744)
Transfers into Level 3	(4)	30	6	8
Transfers out of Level 3	(8)	(16)	(14)	(25)
Balance, end of period	(1,061)	(687)	(1,061)	(687)
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	(209)	229	(249)	(216)
Other Assets [Member]
Assets:
Balance, beginning of period	311	377	314	1,373
Net income	6	2	8	25
Net gains included in other comprehensive income	0	0	0	0
Purchases, sales, issuances and settlements, net	(17)	(19)	(22)	(49)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	(989)
Balance, end of period	300	360	300	360
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	8	(6)	9	(12)
Short sale liabilities (corporate debt securities) [Member]
Liabilities:
Balance, beginning of period	(106)	(65)	0	(26)
Net income	0	1	1	(1)
Net gains included in other comprehensive income	0	0	0	0
Purchases, sales, issuances and settlements, net	106	(5)	(1)	(42)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	65	0	65
Balance, end of period	0	(4)	0	(4)
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	3	0	1	0
Other Liabilities Excluding Derivatives And Short Sale Liabilities [Member]
Liabilities:
Balance, beginning of period	(136)	(376)	(344)	(10)
Net income	0	(18)	(9)	(54)
Net gains included in other comprehensive income	0	0	0	0
Purchases, sales, issuances and settlements, net	99	6	316	35
Transfers into Level 3	0	0	0	(359)
Transfers out of Level 3	0	0	0	0
Balance, end of period	(37)	(388)	(37)	(388)
Net unrealized gains (losses) included in net income related to assets and liabilities held at period end	$ 0	$ (18)	$ 0	$ (55)