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Fair Value (Reconciliation of Recurring Fair Value Measurements) (Details) (Fair Value, Measurements, Recurring [Member], Level 3 [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Available-for-sale Securities [Member]
Jun. 30, 2013
Available-for-sale Securities [Member]
Jun. 30, 2014
Available-for-sale Securities [Member]
Jun. 30, 2013
Available-for-sale Securities [Member]
Jun. 30, 2014
Available-for-sale Securities [Member]
Residential mortgage-backed Securities [Member]
Mortgage-backed Securities Non-agency [Member]
Jun. 30, 2013
Available-for-sale Securities [Member]
Residential mortgage-backed Securities [Member]
Mortgage-backed Securities Non-agency [Member]
Jun. 30, 2014
Available-for-sale Securities [Member]
Residential mortgage-backed Securities [Member]
Mortgage-backed Securities Non-agency [Member]
Jun. 30, 2013
Available-for-sale Securities [Member]
Residential mortgage-backed Securities [Member]
Mortgage-backed Securities Non-agency [Member]
Jun. 30, 2013
Available-for-sale Securities [Member]
Commercial mortgage-backed securities [Member]
Mortgage-backed Securities Non-agency [Member]
Jun. 30, 2013
Available-for-sale Securities [Member]
Commercial mortgage-backed securities [Member]
Mortgage-backed Securities Non-agency [Member]
Jun. 30, 2014
Available-for-sale Securities [Member]
Asset backed [Member]
Jun. 30, 2013
Available-for-sale Securities [Member]
Asset backed [Member]
Jun. 30, 2014
Available-for-sale Securities [Member]
Asset backed [Member]
Jun. 30, 2013
Available-for-sale Securities [Member]
Asset backed [Member]
Jun. 30, 2014
Available-for-sale Securities [Member]
State and Municipal [Member]
Jun. 30, 2013
Available-for-sale Securities [Member]
State and Municipal [Member]
Jun. 30, 2014
Available-for-sale Securities [Member]
State and Municipal [Member]
Jun. 30, 2013
Available-for-sale Securities [Member]
State and Municipal [Member]
Jun. 30, 2014
Available-for-sale Securities [Member]
Other debt [Member]
Jun. 30, 2013
Available-for-sale Securities [Member]
Other debt [Member]
Jun. 30, 2014
Available-for-sale Securities [Member]
Other debt [Member]
Jun. 30, 2013
Available-for-sale Securities [Member]
Other debt [Member]
Jun. 30, 2014
Financial Derivatives [Member]
Jun. 30, 2013
Financial Derivatives [Member]
Jun. 30, 2014
Financial Derivatives [Member]
Jun. 30, 2013
Financial Derivatives [Member]
Jun. 30, 2014
Trading Securities - Debt [Member]
Jun. 30, 2013
Trading Securities - Debt [Member]
Jun. 30, 2014
Trading Securities - Debt [Member]
Jun. 30, 2013
Trading Securities - Debt [Member]
Jun. 30, 2014
Mortgage Servicing Rights [Member]
Residential Mortgage [Member]
Jun. 30, 2013
Mortgage Servicing Rights [Member]
Residential Mortgage [Member]
Jun. 30, 2014
Mortgage Servicing Rights [Member]
Residential Mortgage [Member]
Jun. 30, 2013
Mortgage Servicing Rights [Member]
Residential Mortgage [Member]
Jan. 31, 2014
Mortgage Servicing Rights [Member]
Commercial Mortgage [Member]
Jun. 30, 2014
Mortgage Servicing Rights [Member]
Commercial Mortgage [Member]
Jun. 30, 2014
Mortgage Servicing Rights [Member]
Commercial Mortgage [Member]
Jun. 30, 2014
Loans Held For Sale [Member]
Residential Mortgage [Member]
Jun. 30, 2013
Loans Held For Sale [Member]
Residential Mortgage [Member]
Jun. 30, 2014
Loans Held For Sale [Member]
Residential Mortgage [Member]
Jun. 30, 2013
Loans Held For Sale [Member]
Residential Mortgage [Member]
Jun. 30, 2014
Loans Held For Sale [Member]
Commercial Mortgage [Member]
Jun. 30, 2013
Loans Held For Sale [Member]
Commercial Mortgage [Member]
Jun. 30, 2014
Loans Held For Sale [Member]
Commercial Mortgage [Member]
Jun. 30, 2013
Loans Held For Sale [Member]
Commercial Mortgage [Member]
Jun. 30, 2014
Equity Investments [Member]
Jun. 30, 2013
Equity Investments [Member]
Jun. 30, 2014
Equity Investments [Member]
Jun. 30, 2013
Equity Investments [Member]
Jun. 30, 2014
Equity Investments [Member]
Direct Equity Investments [Member]
Jun. 30, 2013
Equity Investments [Member]
Direct Equity Investments [Member]
Jun. 30, 2014
Equity Investments [Member]
Direct Equity Investments [Member]
Jun. 30, 2013
Equity Investments [Member]
Direct Equity Investments [Member]
Jun. 30, 2014
Equity Investments [Member]
Indirect Equity Investments [Member]
Jun. 30, 2013
Equity Investments [Member]
Indirect Equity Investments [Member]
Jun. 30, 2014
Equity Investments [Member]
Indirect Equity Investments [Member]
Jun. 30, 2013
Equity Investments [Member]
Indirect Equity Investments [Member]
Jun. 30, 2014
Loans [Member]
Jun. 30, 2013
Loans [Member]
Jun. 30, 2014
Loans [Member]
Jun. 30, 2013
Loans [Member]
Jun. 30, 2014
Other Assets [Member]
Jun. 30, 2013
Other Assets [Member]
Jun. 30, 2014
Other Assets [Member]
Jun. 30, 2013
Other Assets [Member]
Jun. 30, 2014
Other Assets [Member]
Jun. 30, 2013
Other Assets [Member]
Jun. 30, 2014
Other Assets [Member]
Jun. 30, 2013
Other Assets [Member]
Jun. 30, 2014
Other Assets [Member]
BlackRock Series C Preferred Stock
Jun. 30, 2013
Other Assets [Member]
BlackRock Series C Preferred Stock
Jun. 30, 2014
Other Assets [Member]
BlackRock Series C Preferred Stock
Jun. 30, 2013
Other Assets [Member]
BlackRock Series C Preferred Stock
Jun. 30, 2014
Other Borrowed Funds [Member]
Jun. 30, 2013
Other Borrowed Funds [Member]
Jun. 30, 2014
Other Borrowed Funds [Member]
Jun. 30, 2013
Other Borrowed Funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                                                                                                                                                                  
Beginning Balance $ 11,052 $ 11,206 $ 10,635 $ 10,988 $ 6,239 $ 7,118 $ 6,370 $ 7,202 $ 5,234 $ 6,038 $ 5,358 $ 6,107     $ 642 $ 701 $ 641 $ 708 $ 331 $ 330 $ 333 $ 339 $ 32 $ 49 $ 38 $ 48 $ 30 $ 93 $ 36 $ 106 $ 32 $ 32 $ 32 $ 32 $ 1,039 $ 779 $ 1,087 $ 650   $ 529   $ 5 $ 44 $ 8 $ 27 $ 577 $ 769 $ 586 $ 772 $ 1,757 $ 1,820 $ 1,664 $ 1,813 $ 1,163 $ 1,193 $ 1,069 $ 1,171 $ 594 $ 627 $ 595 $ 642 $ 506 $ 272 $ 512 $ 134 $ 338 $ 279 $ 340 $ 252 $ 8 $ 9 $ 8 $ 9 $ 330 $ 270 $ 332 $ 243        
Included in earnings 110 360 195 674 44 50 81 98 40 47 74 90 2 3 4 1 8 4     (2) 1     1   59 64 119 153 1    1   (57) 208 (116) 286   (11) (25) 1   1 1 5 (13) 7 (12) 53 35 105 67 38 15 72 34 15 20 33 33 10 16 19 21 5   3 60          5    3 60        
Included in other comprehensive income 44 (99) 118 67 44 (98) 118 68 31 (100) 85 39       4 19 29 13 (2) 14                                                                                           (1)   (1)   (1)   (1)                
Purchases 141 82 277 194 1 5 1 6                       4   4 1 1 1 2 1 1 1 2              17 64   9 16 3 21 8 49         105 55 180 73 99 49 168 63 6 6 12 10 22   54                                   
Sales (254) (275) (303) (320) (1) (2) (7) (2)                             (1) (2) (7) (2)                               (1) (1) (3) (1)   (100)   (102) (120) (172) (155) (215) (81) (142) (90) (153) (39) (30) (65) (62) (132)   (138)                                  
Issuances 30 43 60 80                                                             20 43 43 80   10 17                                                                                
Settlements (419) (501) (250) (863) (225) (311) (461) (610) (198) (274) (410) (525) (2) (3) (27) (34) (49) (69) 1 (1)    (13) (1)   (2)   (49) (105) (115) (208)         (35) (55) (64) (105) 552 (22) 507 (1) 1 (1) 1 (61) (21) (72) (23) (2)   (1)           (2)   (1)   (24) (10) (43) 115       (33)               (33)        
Transfers Into Level 3 4 48 14 63                                                                           1 3 4 6                                 3 45 10 57                                
Transfers Out of Level 3 (29) (52) (67) (71)                                               (2)   (2)                       (4) (38) (13) (53)                                 (25) (12) (54) (16)                                
Ending Balance 10,679 10,812 10,679 10,812 6,102 6,762 6,102 6,762 5,107 5,711 5,107 5,711     619 672 619 672 345 331 345 331 31 48 31 48 41 51 41 51 33 32 33 32 967 975 967 975   515 515 4 30 4 30 521 635 521 635 1,793 1,738 1,793 1,738 1,219 1,115 1,219 1,115 574 623 574 623 360 311 360 311 343 278 343 278 8 8 8 8 335 270 335 270        
Unrealized gains or (losses) on assets held on Consolidated Balance Sheet 43 272 59 490 (1) (4) (3) (14) (1) (3) (3) (10)       (1)   (4)                 47 50 80 113 2   2   (57) 208 (114) 279   (11) (25) 1   1 1 5 (14) 7 (13) 44 20 94 47 30   63 14 14 20 31 33 8 12 14 17 5   3 60         5   3 60        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                                                                                                                                                                  
Beginning Balance 621 530 623 376                                             440 400 439 376                                                                                               181 130 184  
Included in earnings 23 87 67 163                                             30 84 70 160                                                                                               (7) 3 (3) 3
Sales   1 1 1                                               1 1 1                                                                                                      
Settlements (20) (40) (67) 38                                             (16) (102) (56) (154)                                                                                               (4) 62 (11) 192
Ending Balance 624 578 624 578                                             454 383 454 383                                                                                               170 195 170 195
Unrealized gains or (losses) on liabilities held on Consolidated Balance Sheet 16 16 22 77                                             16 16 22 77                                                                                                      
Fair Value Additional Information [Abstract]                                                                                                                                                                  
Net gains (losses) included in earnings (realized and unrealized) relating to Level 3 assets and liabilities 87 273 128 511                                                                                                                                                          
Amortization and accretion included in earnings relating to Level 3 assets and liabilities 44 54 85 111                                                                                                                                                          
Net unrealized gains (losses) relating to Level 3 assets and liabilities $ 27 $ 256 $ 37 $ 413