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Fair Value (Reconciliation of Recurring Fair Value Measurements) (Details) (USD $)
In Millions, unless otherwise specified
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 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, 2013
Jun. 30, 2012
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Available-for-sale Securities [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Available-for-sale Securities [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Available-for-sale Securities [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Available-for-sale Securities [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Available-for-sale Securities [Member]
Residential mortgage-backed Securities
Mortgage-backed Securities Non-agency [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Available-for-sale Securities [Member]
Residential mortgage-backed Securities
Mortgage-backed Securities Non-agency [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Available-for-sale Securities [Member]
Residential mortgage-backed Securities
Mortgage-backed Securities Non-agency [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Available-for-sale Securities [Member]
Residential mortgage-backed Securities
Mortgage-backed Securities Non-agency [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Available-for-sale Securities [Member]
Commercial mortgage-backed securities [Member]
Mortgage-backed Securities Non-agency [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Available-for-sale Securities [Member]
Commercial mortgage-backed securities [Member]
Mortgage-backed Securities Non-agency [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Available-for-sale Securities [Member]
Commercial mortgage-backed securities [Member]
Mortgage-backed Securities Non-agency [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Available-for-sale Securities [Member]
Commercial mortgage-backed securities [Member]
Mortgage-backed Securities Non-agency [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Available-for-sale Securities [Member]
Asset backed [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Available-for-sale Securities [Member]
Asset backed [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Available-for-sale Securities [Member]
Asset backed [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Available-for-sale Securities [Member]
Asset backed [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Available-for-sale Securities [Member]
State and Municipal [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Available-for-sale Securities [Member]
State and Municipal [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Available-for-sale Securities [Member]
State and Municipal [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Available-for-sale Securities [Member]
State and Municipal [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Available-for-sale Securities [Member]
Other Debt Securities [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Available-for-sale Securities [Member]
Other Debt Securities [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Available-for-sale Securities [Member]
Other Debt Securities [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Available-for-sale Securities [Member]
Other Debt Securities [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Financial Derivatives [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Financial Derivatives [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Financial Derivatives [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Financial Derivatives [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Trading Securities - Debt [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Trading Securities - Debt [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Trading Securities - Debt [Member]
Mar. 31, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Trading Securities - Debt [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Trading Securities - Debt [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mortgage Servicing Rights [Member]
Residential Mortgage [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mortgage Servicing Rights [Member]
Residential Mortgage [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mortgage Servicing Rights [Member]
Residential Mortgage [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mortgage Servicing Rights [Member]
Residential Mortgage [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Loans Held For Sale [Member]
Residential Mortgage [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Loans Held For Sale [Member]
Residential Mortgage [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Loans Held For Sale [Member]
Commercial Mortgage [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Loans Held For Sale [Member]
Commercial Mortgage [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Loans Held For Sale [Member]
Commercial Mortgage [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Loans Held For Sale [Member]
Commercial Mortgage [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Equity Investments [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Equity Investments [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Equity Investments [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Equity Investments [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Equity Investments [Member]
Direct Equity Investments [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Equity Investments [Member]
Direct Equity Investments [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Equity Investments [Member]
Direct Equity Investments [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Equity Investments [Member]
Direct Equity Investments [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Equity Investments [Member]
Indirect Equity Investments [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Equity Investments [Member]
Indirect Equity Investments [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Equity Investments [Member]
Indirect Equity Investments [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Equity Investments [Member]
Indirect Equity Investments [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Loans [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Loans [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Loans [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Loans [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Other Assets [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Other Assets [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Other Assets [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Other Assets [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Other Assets [Member]
Other Assets
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Other Assets [Member]
Other Assets
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Other Assets [Member]
Other Assets
Mar. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Other Assets [Member]
Other Assets
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Other Assets [Member]
Other Assets
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Other Assets [Member]
BlackRock Series C Preferred Stock
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Other Assets [Member]
BlackRock Series C Preferred Stock
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Other Assets [Member]
BlackRock Series C Preferred Stock
Mar. 31, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Other Assets [Member]
BlackRock Series C Preferred Stock
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Other Borrowed Funds [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Other Borrowed Funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                                                                                                                                                                
Beginning Balance     $ 11,206 $ 10,727 $ 10,988 $ 10,051 $ 7,118 $ 7,264 $ 7,202 $ 6,729 $ 6,038 $ 6,121 $ 6,107 $ 5,557         $ 701 $ 752 $ 708 $ 787 $ 330 $ 336 $ 339 $ 336 $ 49 $ 55 $ 48 $ 49 $ 93 $ 84 $ 106 $ 67 $ 39 $ 39 $ 32 $ 32 $ 32 $ 779 $ 724 $ 650 $ 647 $ 44 $ 27 $ 769 $ 840 $ 772 $ 843 $ 1,820 $ 1,522 $ 1,813 $ 1,504 $ 1,193 $ 865 $ 1,171 $ 856 $ 627 $ 657 $ 642 $ 648 $ 272 $ 6 $ 134 $ 5 $ 279 $ 248 $ 252 $ 217 $ 9 $ 9 $ 7 $ 7 $ 7 $ 241 $ 243 $ 210 $ 270    
Included in earnings     360 32 674 195 50 21 98 5 47 20 90 11 2 1 3 2 1 (1) 4 (7)   1 1         (1) 64 115 153 195 2 3       208 (126) 286 (106)   1 (13) 4 (12) (2) 35 57 67 110 15 20 34 42 20 37 33 68 16   21     (41) 60 (10)           (41) 60 (10)      
Included in other comprehensive income     (99) (17) 67 549 (98) (17) 68 549 (100) (34) 39 486         4 17 29 59 (2)     3       1                                                                       (1)   (1)   (1) (1)                  
Purchases     82 187 194 315 5 50 6 56   47   47                 4   4   1 3 2 9 1 1 2 4               64 64 21 49         55 135 73 189 49 116 63 159 6 19 10 30   1   2                              
Sales     (275) (130) (320) (426) (2) (50) (2) (253)       (163)           (47)   (87)         (2) (3) (2) (3)                           (1) (1) (100)   (102) (4) (172) (80) (215) (169) (142) (44) (153) (100) (30) (36) (62) (69)                                      
Issuances     43 24 80 53                                                                   43 24 80 53                                                                          
Settlements     (501) (431) (863) (805) (311) (301) (610) (577) (274) (267) (525) (509) (2) (1) (3) (2) (34) (33) (69) (64) (1)   (13) (2)         (105) (82) (208) (150)   (1)       (55) (41) (105) (77) 1 1 (21) (7) (23)                           (10)   115       (33)               (33)        
Transfers Into Level 3    460 48   63 461       458       458                                       3                   3 6                                 45   57                                
Transfers Out of Level 3     (52) (1) (71) (2)                                                 (2) (1) (2) (2)                   (38) (53)                                 (12)   (16)                                
Ending Balance     10,812 10,391 10,812 10,391 6,762 6,967 6,762 6,967 5,711 5,887 5,711 5,887         672 688 672 688 331 337 331 337 48 55 48 55 51 117 51 117 41 41 32 32 32 975 581 975 581 30 30 635 837 635 837 1,738 1,634 1,738 1,634 1,115 957 1,115 957 623 677 623 677 311 7 311 7 278 207 278 207 8 8 7 7 7 200 270 200 270    
Unrealized gains or losses on assets held on Consolidated Balance Sheet     272 (22) 490 94 (4) (34) (14) (72) (3) (31) (10) (63)         (1) (3) (4) (8)               (1) 50 123 113 176 1 2       208 (124) 279 (104)   1 (14) (2) (13) (4) 20 55 47 106   20 14 41 20 35 33 65 12   17     (41) 60 (10)           (41) 60 (10)      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                                                                                                                                                                
Beginning Balance     530 334 376 308                                                 400   376                                                                                           130  
Included in Earnings     87 (56) 163 21                                                 84   160                                                                                           3 3
Sales     1 1 1 1                                                 1   1                                                                                              
Settlements     (40) 10 38 (40)                                                 (102)   (154)                                                                                           62 192
Transfer into Level 3           1                                                                                                                                                    
Transfer out of Level 3           (2)                                                                                                                                                    
Ending Balance     578 289 578 289                                                 383   383                                                                                           195 195
Unrealized gains or losses on liabilities held on Consolidated Balance Sheet     16 (40) 77 (8)                                                 16   77                                                                                              
Fair Value Additional Information [Abstract]                                                                                                                                                                
Net gains (losses) included in earnings (realized and unrealized) relating to Level 3 assets and liabilities     273 88 511 174                                                                                                                                                    
Amortization and accretion included in earnings relating to Level 3 assets and liabilities     54 54 111 86                                                                                                                                                    
Net unrealized gains (losses) relating to Level 3 assets and liabilities     $ 256 $ 18 $ 413 $ 102