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Investment Securities, Unrealized Loss Position, by Credit Rating (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Available-for-sale securities:    
Gross unrealized losses $ (1,936) $ (1,922)
Fair value 260,667 257,442
Held-to-maturity securities:    
Gross unrealized losses (493) (21)
Fair value 80,315 56,359
Total investment securities:    
Gross unrealized losses (2,429) (1,943)
Fair value 340,982 313,801
Total debt securities [Member]    
Available-for-sale securities:    
Gross unrealized losses (1,922) (1,850)
Fair value 258,180 253,766
Held-to-maturity securities:    
Fair value 80,315 56,359
Securities of U.S. Treasury and federal agencies [Member]    
Available-for-sale securities:    
Gross unrealized losses (128) (138)
Fair value 35,944 25,804
Held-to-maturity securities:    
Gross unrealized losses (97) (8)
Fair value 45,092 41,548
Securities of U.S. states and political subdivisions [Member]    
Available-for-sale securities:    
Gross unrealized losses (596) (499)
Fair value 48,298 44,944
Held-to-maturity securities:    
Gross unrealized losses (26) 0
Fair value 2,150 1,989
Mortgage-backed securities: [Member]    
Available-for-sale securities:    
Gross unrealized losses (953) (832)
Fair value 123,848 136,352
Federal agencies [Member]    
Available-for-sale securities:    
Gross unrealized losses (888) (751)
Fair value 100,078 110,089
Held-to-maturity securities:    
Gross unrealized losses (369) 0
Fair value 27,338 5,641
Residential [Member]    
Available-for-sale securities:    
Gross unrealized losses (13) (24)
Fair value 8,461 9,269
Commercial [Member]    
Available-for-sale securities:    
Gross unrealized losses (52) (57)
Fair value 15,309 16,994
Corporate debt securities [Member]    
Available-for-sale securities:    
Gross unrealized losses (176) (170)
Fair value 14,974 14,786
Collateralized loan and other debt obligations [Member]    
Available-for-sale securities:    
Gross unrealized losses (55) (184)
Fair value 29,323 25,361
Held-to-maturity securities:    
Gross unrealized losses (1) (13)
Fair value 1,407 1,391
Other [Member]    
Available-for-sale securities:    
Gross unrealized losses (14) (27)
Fair value 5,793 6,519
Held-to-maturity securities:    
Gross unrealized losses 0 0
Fair value 4,328 5,790
Total marketable equity securities [Member]    
Available-for-sale securities:    
Gross unrealized losses (14) (72)
Fair value 2,487 3,676
Perpetual preferred securities [Member]    
Available-for-sale securities:    
Gross unrealized losses (12) (70)
Fair value 958 1,700
Investment grade [Member]    
Available-for-sale securities:    
Gross unrealized losses (1,720) (1,676)
Fair value 86,432 89,445
Held-to-maturity securities:    
Gross unrealized losses (493) (21)
Fair value 32,383 3,280
Total investment securities:    
Gross unrealized losses (2,213) (1,697)
Fair value 118,815 92,725
Investment grade [Member] | Total debt securities [Member]    
Available-for-sale securities:    
Gross unrealized losses (1,708) (1,606)
Fair value 86,308 88,720
Investment grade [Member] | Securities of U.S. Treasury and federal agencies [Member]    
Available-for-sale securities:    
Gross unrealized losses (128) (138)
Fair value 15,452 12,857
Held-to-maturity securities:    
Gross unrealized losses (97) (8)
Fair value 7,137 1,889
Investment grade [Member] | Securities of U.S. states and political subdivisions [Member]    
Available-for-sale securities:    
Gross unrealized losses (549) (459)
Fair value 16,567 13,600
Held-to-maturity securities:    
Gross unrealized losses (26)  
Fair value 1,731  
Investment grade [Member] | Mortgage-backed securities: [Member]    
Available-for-sale securities:    
Gross unrealized losses (919) (775)
Fair value 41,825 43,065
Investment grade [Member] | Federal agencies [Member]    
Available-for-sale securities:    
Gross unrealized losses (888) (751)
Fair value 36,848 39,560
Held-to-maturity securities:    
Gross unrealized losses (369)  
Fair value 22,509  
Investment grade [Member] | Residential [Member]    
Available-for-sale securities:    
Gross unrealized losses (3) 0
Fair value 516 139
Investment grade [Member] | Commercial [Member]    
Available-for-sale securities:    
Gross unrealized losses (28) (24)
Fair value 4,461 3,366
Investment grade [Member] | Corporate debt securities [Member]    
Available-for-sale securities:    
Gross unrealized losses (46) (39)
Fair value 2,382 1,807
Investment grade [Member] | Collateralized loan and other debt obligations [Member]    
Available-for-sale securities:    
Gross unrealized losses (54) (172)
Fair value 8,976 16,609
Held-to-maturity securities:    
Gross unrealized losses (1) (13)
Fair value 1,006 1,391
Investment grade [Member] | Other [Member]    
Available-for-sale securities:    
Gross unrealized losses (12) (23)
Fair value 1,106 782
Investment grade [Member] | Perpetual preferred securities [Member]    
Available-for-sale securities:    
Gross unrealized losses (12) (70)
Fair value 124 725
Non-investment grade [Member]    
Available-for-sale securities:    
Gross unrealized losses (214) (244)
Fair value 2,925 3,111
Held-to-maturity securities:    
Gross unrealized losses 0 0
Fair value 0 0
Total investment securities:    
Gross unrealized losses (214) (244)
Fair value 2,925 3,111
Non-investment grade [Member] | Total debt securities [Member]    
Available-for-sale securities:    
Gross unrealized losses (214) (244)
Fair value 2,925 3,111
Non-investment grade [Member] | Securities of U.S. Treasury and federal agencies [Member]    
Available-for-sale securities:    
Gross unrealized losses 0 0
Fair value 0 0
Held-to-maturity securities:    
Gross unrealized losses 0 0
Fair value 0 0
Non-investment grade [Member] | Securities of U.S. states and political subdivisions [Member]    
Available-for-sale securities:    
Gross unrealized losses (47) (40)
Fair value 465 353
Held-to-maturity securities:    
Gross unrealized losses 0  
Fair value 0  
Non-investment grade [Member] | Mortgage-backed securities: [Member]    
Available-for-sale securities:    
Gross unrealized losses (34) (57)
Fair value 867 1,319
Non-investment grade [Member] | Federal agencies [Member]    
Available-for-sale securities:    
Gross unrealized losses 0 0
Fair value 0 0
Held-to-maturity securities:    
Gross unrealized losses 0  
Fair value 0  
Non-investment grade [Member] | Residential [Member]    
Available-for-sale securities:    
Gross unrealized losses (10) (24)
Fair value 494 951
Non-investment grade [Member] | Commercial [Member]    
Available-for-sale securities:    
Gross unrealized losses (24) (33)
Fair value 373 368
Non-investment grade [Member] | Corporate debt securities [Member]    
Available-for-sale securities:    
Gross unrealized losses (130) (131)
Fair value 1,368 1,132
Non-investment grade [Member] | Collateralized loan and other debt obligations [Member]    
Available-for-sale securities:    
Gross unrealized losses (1) (12)
Fair value 36 104
Held-to-maturity securities:    
Gross unrealized losses 0 0
Fair value 0 0
Non-investment grade [Member] | Other [Member]    
Available-for-sale securities:    
Gross unrealized losses (2) (4)
Fair value 189 203
Non-investment grade [Member] | Perpetual preferred securities [Member]    
Available-for-sale securities:    
Gross unrealized losses 0 0
Fair value $ 0 $ 0