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Fair Value, Assets and Liabilities Recorded at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Assets:    
Available-for-sale, at fair value $ 260,667 $ 257,442
Mortgages held for sale 21,539 15,565
Loans held for sale 0 1
Loans 5,651 5,788
Mortgage servicing rights 12,661 12,738
Derivatives (trading and other assets) 83,895 88,474
Fair value asset derivatives, net 18,409 22,605
Other assets, carried at fair value 2,636 2,512
Liabilities:    
Total derivative liabilities (81,075) (83,781)
Fair value liability derivatives, net (14,696) (18,738)
Interest rate contract [Member]    
Assets:    
Derivatives (trading and other assets) 61,698 63,698
Fair value asset derivatives, net 5,949 7,647
Liabilities:    
Total derivative liabilities (58,647) (60,059)
Fair value liability derivatives, net (4,799) (5,665)
Commodity contract [Member]    
Assets:    
Derivatives (trading and other assets) 4,642 7,461
Fair value asset derivatives, net 3,683 6,228
Liabilities:    
Total derivative liabilities (5,223) (7,702)
Fair value liability derivatives, net (4,082) (6,243)
Equity contract [Member]    
Assets:    
Derivatives (trading and other assets) 9,117 9,005
Fair value asset derivatives, net 5,930 6,163
Liabilities:    
Total derivative liabilities (6,328) (7,038)
Fair value liability derivatives, net (3,486) (4,193)
Foreign exchange contract [Member]    
Assets:    
Derivatives (trading and other assets) 7,695 7,404
Fair value asset derivatives, net 2,755 2,481
Liabilities:    
Total derivative liabilities (9,971) (7,827)
Fair value liability derivatives, net (2,100) (2,316)
Other contract [Member]    
Liabilities:    
Total derivative liabilities (38) (44)
Fair value liability derivatives, net (38) (44)
Fair Value, Measurements, Recurring [Member]    
Assets:    
Trading assets (excluding derivatives) 63,237 59,914
Total trading assets (excluding derivatives) 65,098 61,367
Available-for-sale, at fair value 260,667 257,442
Mortgages held for sale 21,539 15,565
Loans held for sale 0 1
Loans 5,651 5,788
Mortgage servicing rights 12,661 12,738
Fair value asset derivatives, netting (65,486) (65,869)
Fair value asset derivatives, net 18,409 22,605
Other assets, carried at fair value 2,711 2,593
Total assets recorded at fair value 386,736 378,099
Liabilities:    
Fair value liability derivatives, netting 66,379 65,043
Fair value liability derivatives, net (14,696) (18,738)
Total short sale liabilities (15,903) (16,100)
Other liabilities (30) (28)
Total liabilities recorded at fair value (30,629) (34,866)
Fair Value, Measurements, Recurring [Member] | Interest rate contract [Member]    
Assets:    
Derivatives (trading and other assets) 61,698 63,698
Liabilities:    
Total derivative liabilities (58,647) (60,059)
Fair Value, Measurements, Recurring [Member] | Commodity contract [Member]    
Assets:    
Derivatives (trading and other assets) 4,642 7,461
Liabilities:    
Total derivative liabilities (5,223) (7,702)
Fair Value, Measurements, Recurring [Member] | Equity contract [Member]    
Assets:    
Derivatives (trading and other assets) 9,117 9,005
Liabilities:    
Total derivative liabilities (6,328) (7,038)
Fair Value, Measurements, Recurring [Member] | Foreign exchange contract [Member]    
Assets:    
Derivatives (trading and other assets) 7,695 7,404
Liabilities:    
Total derivative liabilities (9,971) (7,827)
Fair Value, Measurements, Recurring [Member] | Credit contract [Member]    
Assets:    
Derivatives (trading and other assets) 743 906
Liabilities:    
Total derivative liabilities (868) (1,111)
Fair Value, Measurements, Recurring [Member] | Other contract [Member]    
Liabilities:    
Total derivative liabilities (38) (44)
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member]    
Assets:    
Available-for-sale, at fair value 258,180 253,766
Fair Value, Measurements, Recurring [Member] | Securities of U.S. Treasury and federal agencies [Member]    
Assets:    
Trading assets (excluding derivatives) 15,075 14,392
Available-for-sale, at fair value 35,944 25,804
Liabilities:    
Total short sale liabilities (9,858) (8,679)
Fair Value, Measurements, Recurring [Member] | Securities of U.S. states and political subdivisions [Member]    
Assets:    
Trading assets (excluding derivatives) 2,182 1,544
Available-for-sale, at fair value 48,298 44,944
Liabilities:    
Total short sale liabilities (10) (26)
Fair Value, Measurements, Recurring [Member] | Collateralized loan and other debt obligations [Member]    
Assets:    
Trading assets (excluding derivatives) 777 719
Available-for-sale, at fair value 29,323 25,361
Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member]    
Assets:    
Trading assets (excluding derivatives) 7,851 7,571
Available-for-sale, at fair value 14,974 14,786
Liabilities:    
Total short sale liabilities (4,151) (5,055)
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities [Member]    
Assets:    
Trading assets (excluding derivatives) 20,826 16,273
Available-for-sale, at fair value 123,848 136,352
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Assets:    
Available-for-sale, at fair value 100,078 110,089
Fair Value, Measurements, Recurring [Member] | Residential [Member]    
Assets:    
Available-for-sale, at fair value 8,461 9,269
Fair Value, Measurements, Recurring [Member] | Commercial [Member]    
Assets:    
Available-for-sale, at fair value 15,309 16,994
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member]    
Assets:    
Trading assets (excluding derivatives) 1,232 855
Available-for-sale, at fair value 5,773 6,499
Fair Value, Measurements, Recurring [Member] | Auto loans and leases [Member]    
Assets:    
Available-for-sale, at fair value 286 276
Fair Value, Measurements, Recurring [Member] | Home equity loans [Member]    
Assets:    
Available-for-sale, at fair value 457 662
Fair Value, Measurements, Recurring [Member] | Other asset-backed securities [Member]    
Assets:    
Available-for-sale, at fair value 5,030 5,561
Fair Value, Measurements, Recurring [Member] | Other trading assets [Member]    
Assets:    
Other trading assets 1,861 1,453
Fair Value, Measurements, Recurring [Member] | Other debt securities    
Assets:    
Available-for-sale, at fair value 20 20
Fair Value, Measurements, Recurring [Member] | Other short sale liabilities [Member]    
Liabilities:    
Total short sale liabilities (19) (79)
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]    
Assets:    
Trading assets (excluding derivatives) 15,294 18,560
Available-for-sale, at fair value 2,487 3,676
Liabilities:    
Total short sale liabilities (1,865) (2,261)
Fair Value, Measurements, Recurring [Member] | Perpetual preferred securities [Member]    
Assets:    
Available-for-sale, at fair value 958 1,700
Fair Value, Measurements, Recurring [Member] | Other marketable equity securities [Member]    
Assets:    
Available-for-sale, at fair value 1,529 1,976
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets:    
Trading assets (excluding derivatives) 26,247 29,018
Total trading assets (excluding derivatives) 26,247 29,018
Available-for-sale, at fair value 32,016 22,402
Mortgages held for sale 0 0
Loans held for sale 0 0
Loans 0 0
Mortgage servicing rights 0 0
Fair value asset derivatives, netting 0 0
Fair value asset derivatives, net 4,467 4,194
Other assets, carried at fair value 0 0
Total assets recorded at fair value 62,730 55,614
Liabilities:    
Fair value liability derivatives, netting 0 0
Fair value liability derivatives, net (1,146) (1,379)
Total short sale liabilities (10,553) (9,302)
Other liabilities 0 0
Total liabilities recorded at fair value (11,699) (10,681)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest rate contract [Member]    
Assets:    
Derivatives (trading and other assets) 77 27
Liabilities:    
Total derivative liabilities (32) (29)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commodity contract [Member]    
Assets:    
Derivatives (trading and other assets) 0 0
Liabilities:    
Total derivative liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Equity contract [Member]    
Assets:    
Derivatives (trading and other assets) 4,357 4,102
Liabilities:    
Total derivative liabilities (1,082) (1,290)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign exchange contract [Member]    
Assets:    
Derivatives (trading and other assets) 33 65
Liabilities:    
Total derivative liabilities (32) (60)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Credit contract [Member]    
Assets:    
Derivatives (trading and other assets) 0 0
Liabilities:    
Total derivative liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other contract [Member]    
Liabilities:    
Total derivative liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member]    
Assets:    
Available-for-sale, at fair value 30,054 19,982
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Securities of U.S. Treasury and federal agencies [Member]    
Assets:    
Trading assets (excluding derivatives) 11,038 10,506
Available-for-sale, at fair value 29,989 19,899
Liabilities:    
Total short sale liabilities (8,690) (7,043)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Securities of U.S. states and political subdivisions [Member]    
Assets:    
Trading assets (excluding derivatives) 0 0
Available-for-sale, at fair value 0 0
Liabilities:    
Total short sale liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Collateralized loan and other debt obligations [Member]    
Assets:    
Trading assets (excluding derivatives) 0 0
Available-for-sale, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate debt securities [Member]    
Assets:    
Trading assets (excluding derivatives) 0 0
Available-for-sale, at fair value 65 83
Liabilities:    
Total short sale liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Mortgage-Backed Securities [Member]    
Assets:    
Trading assets (excluding derivatives) 0 0
Available-for-sale, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Assets:    
Available-for-sale, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Residential [Member]    
Assets:    
Available-for-sale, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial [Member]    
Assets:    
Available-for-sale, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-backed securities [Member]    
Assets:    
Trading assets (excluding derivatives) 0 0
Available-for-sale, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Auto loans and leases [Member]    
Assets:    
Available-for-sale, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Home equity loans [Member]    
Assets:    
Available-for-sale, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other asset-backed securities [Member]    
Assets:    
Available-for-sale, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other trading assets [Member]    
Assets:    
Other trading assets 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other debt securities    
Assets:    
Available-for-sale, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other short sale liabilities [Member]    
Liabilities:    
Total short sale liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]    
Assets:    
Trading assets (excluding derivatives) 15,209 18,512
Available-for-sale, at fair value 1,962 2,420
Liabilities:    
Total short sale liabilities (1,863) (2,259)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Perpetual preferred securities [Member]    
Assets:    
Available-for-sale, at fair value 456 468
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other marketable equity securities [Member]    
Assets:    
Available-for-sale, at fair value 1,506 1,952
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets:    
Trading assets (excluding derivatives) 36,541 30,301
Total trading assets (excluding derivatives) 38,340 31,699
Available-for-sale, at fair value 223,821 229,011
Mortgages held for sale 19,916 13,252
Loans held for sale 0 1
Loans 0 0
Mortgage servicing rights 0 0
Fair value asset derivatives, netting 0 0
Fair value asset derivatives, net 77,544 82,067
Other assets, carried at fair value 0 0
Total assets recorded at fair value 359,621 356,030
Liabilities:    
Fair value liability derivatives, netting 0 0
Fair value liability derivatives, net (77,960) (80,166)
Total short sale liabilities (5,349) (6,792)
Other liabilities 0 0
Total liabilities recorded at fair value (83,309) (86,958)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest rate contract [Member]    
Assets:    
Derivatives (trading and other assets) 61,302 63,306
Liabilities:    
Total derivative liabilities (58,548) (59,958)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commodity contract [Member]    
Assets:    
Derivatives (trading and other assets) 4,627 7,438
Liabilities:    
Total derivative liabilities (5,211) (7,680)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Equity contract [Member]    
Assets:    
Derivatives (trading and other assets) 3,578 3,544
Liabilities:    
Total derivative liabilities (3,879) (4,305)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign exchange contract [Member]    
Assets:    
Derivatives (trading and other assets) 7,662 7,339
Liabilities:    
Total derivative liabilities (9,939) (7,767)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Credit contract [Member]    
Assets:    
Derivatives (trading and other assets) 375 440
Liabilities:    
Total derivative liabilities (383) (456)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other contract [Member]    
Liabilities:    
Total derivative liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member]    
Assets:    
Available-for-sale, at fair value 223,296 228,418
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Securities of U.S. Treasury and federal agencies [Member]    
Assets:    
Trading assets (excluding derivatives) 4,037 3,886
Available-for-sale, at fair value 5,955 5,905
Liabilities:    
Total short sale liabilities (1,168) (1,636)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Securities of U.S. states and political subdivisions [Member]    
Assets:    
Trading assets (excluding derivatives) 2,174 1,537
Available-for-sale, at fair value 46,409 42,667
Liabilities:    
Total short sale liabilities (10) (26)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized loan and other debt obligations [Member]    
Assets:    
Trading assets (excluding derivatives) 370 274
Available-for-sale, at fair value 28,399 24,274
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate debt securities [Member]    
Assets:    
Trading assets (excluding derivatives) 7,818 7,517
Available-for-sale, at fair value 14,575 14,451
Liabilities:    
Total short sale liabilities (4,151) (5,055)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage-Backed Securities [Member]    
Assets:    
Trading assets (excluding derivatives) 20,826 16,273
Available-for-sale, at fair value 123,745 136,219
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Assets:    
Available-for-sale, at fair value 100,078 110,089
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential [Member]    
Assets:    
Available-for-sale, at fair value 8,461 9,245
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial [Member]    
Assets:    
Available-for-sale, at fair value 15,206 16,885
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed securities [Member]    
Assets:    
Trading assets (excluding derivatives) 1,232 776
Available-for-sale, at fair value 4,193 4,882
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Auto loans and leases [Member]    
Assets:    
Available-for-sale, at fair value 26 31
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Home equity loans [Member]    
Assets:    
Available-for-sale, at fair value 457 662
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other asset-backed securities [Member]    
Assets:    
Available-for-sale, at fair value 3,710 4,189
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other trading assets [Member]    
Assets:    
Other trading assets 1,799 1,398
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other debt securities    
Assets:    
Available-for-sale, at fair value 20 20
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other short sale liabilities [Member]    
Liabilities:    
Total short sale liabilities (18) (73)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]    
Assets:    
Trading assets (excluding derivatives) 84 38
Available-for-sale, at fair value 525 593
Liabilities:    
Total short sale liabilities (2) (2)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Perpetual preferred securities [Member]    
Assets:    
Available-for-sale, at fair value 502 569
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other marketable equity securities [Member]    
Assets:    
Available-for-sale, at fair value 23 24
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets:    
Trading assets (excluding derivatives) 449 595
Total trading assets (excluding derivatives) 511 650
Available-for-sale, at fair value 4,830 6,029
Mortgages held for sale 1,623 2,313
Loans held for sale 0 0
Loans 5,651 5,788
Mortgage servicing rights 12,661 12,738
Fair value asset derivatives, netting 0 0
Fair value asset derivatives, net 1,884 2,213
Other assets, carried at fair value 2,711 2,593
Total assets recorded at fair value 29,871 32,324
Liabilities:    
Fair value liability derivatives, netting 0 0
Fair value liability derivatives, net (1,969) (2,236)
Total short sale liabilities (1) (6)
Other liabilities (30) (28)
Total liabilities recorded at fair value (2,000) (2,270)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest rate contract [Member]    
Assets:    
Derivatives (trading and other assets) 319 365
Liabilities:    
Total derivative liabilities (67) (72)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commodity contract [Member]    
Assets:    
Derivatives (trading and other assets) 15 23
Liabilities:    
Total derivative liabilities (12) (22)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Equity contract [Member]    
Assets:    
Derivatives (trading and other assets) 1,182 1,359
Liabilities:    
Total derivative liabilities (1,367) (1,443)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign exchange contract [Member]    
Assets:    
Derivatives (trading and other assets) 0 0
Liabilities:    
Total derivative liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Credit contract [Member]    
Assets:    
Derivatives (trading and other assets) 368 466
Liabilities:    
Total derivative liabilities (485) (655)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other contract [Member]    
Liabilities:    
Total derivative liabilities (38) (44)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member]    
Assets:    
Available-for-sale, at fair value 4,830 5,366
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Securities of U.S. Treasury and federal agencies [Member]    
Assets:    
Trading assets (excluding derivatives) 0 0
Available-for-sale, at fair value 0 0
Liabilities:    
Total short sale liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Securities of U.S. states and political subdivisions [Member]    
Assets:    
Trading assets (excluding derivatives) 8 7
Available-for-sale, at fair value 1,889 2,277
Liabilities:    
Total short sale liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Collateralized loan and other debt obligations [Member]    
Assets:    
Trading assets (excluding derivatives) 407 445
Available-for-sale, at fair value 924 1,087
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate debt securities [Member]    
Assets:    
Trading assets (excluding derivatives) 33 54
Available-for-sale, at fair value 334 252
Liabilities:    
Total short sale liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage-Backed Securities [Member]    
Assets:    
Trading assets (excluding derivatives) 0 0
Available-for-sale, at fair value 103 133
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Assets:    
Available-for-sale, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Residential [Member]    
Assets:    
Available-for-sale, at fair value 0 24
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial [Member]    
Assets:    
Available-for-sale, at fair value 103 109
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed securities [Member]    
Assets:    
Trading assets (excluding derivatives) 0 79
Available-for-sale, at fair value 1,580 1,617
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Auto loans and leases [Member]    
Assets:    
Available-for-sale, at fair value 260 245
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Home equity loans [Member]    
Assets:    
Available-for-sale, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other asset-backed securities [Member]    
Assets:    
Available-for-sale, at fair value 1,320 1,372
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other trading assets [Member]    
Assets:    
Other trading assets 62 55
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other debt securities    
Assets:    
Available-for-sale, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other short sale liabilities [Member]    
Liabilities:    
Total short sale liabilities (1) (6)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]    
Assets:    
Trading assets (excluding derivatives) 1 10
Available-for-sale, at fair value 0 663
Liabilities:    
Total short sale liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Perpetual preferred securities [Member]    
Assets:    
Available-for-sale, at fair value 0 663
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other marketable equity securities [Member]    
Assets:    
Available-for-sale, at fair value 0 0
Collateralized debt obligations [Member]    
Assets:    
Available-for-sale, at fair value $ 407 $ 500