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Fair Value (Fair Value Measurement - Reconciliation of Level 3 Assets And Liabilities) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Assets, Beginning balance $ 1,461 $ 5,170 $ 3,797 $ 5,451
Net realized/unrealized gains (losses) included in earnings, Assets (212) (1,087) (199) (719)
Net realized/unrealized gains (losses) included in other comprehensive income, Assets 1 (3) 2 15
Purchases, Assets 0 29 12 162
Sales, Assets (11) 0 (256) (425)
Issuances, Assets 50 161 167 490
Settlements, Assets (41) (198) (495) (902)
Fair Value, Assets, Ending balance 1,248 4,072 1,248 4,072
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets (264) (1,098) (638) (1,049)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Liabilities, Beginning balance   (918) (859) (972)
Net realized/unrealized gains (losses) included in earnings, Liabilities   (81) (115) (248)
Net realized/unrealized gains (losses) included in other comprehensive income, Liabilities   0 0 1
Purchases, Liabilities   (14) (11) (37)
Sales, Liabilities   0 0 0
Issuances, Liabilities   0 0 0
Settlements, Liabilities   154 399 397
Transfers out of Level 3 Due to Deconsolidation, Liabilities     586  
Fair Value, Liabilities, Ending balance 0 (859) 0 (859)
Net unrealized gains (losses) included in earnings still held, Liability   (49) (62) (88)
Transfers out of Level 3 Due to Deconsolidation, Assets     1,780  
On-Balance Sheet Securitization Debt [Member]
       
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Liabilities, Beginning balance   (899) (830) (972)
Net realized/unrealized gains (losses) included in earnings, Liabilities   (82) (115) (249)
Net realized/unrealized gains (losses) included in other comprehensive income, Liabilities   0 0 1
Purchases, Liabilities   0 0 0
Sales, Liabilities   0 0 0
Issuances, Liabilities   0 0 0
Settlements, Liabilities   150 389 389
Transfers out of Level 3 Due to Deconsolidation, Liabilities     556  
Fair Value, Liabilities, Ending balance 0 (831) 0 (831)
Net unrealized gains (losses) included in earnings still held, Liability   (50) (62) (89)
Loan repurchase liabilities [Member]
       
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Liabilities, Beginning balance   (19) (29) 0
Net realized/unrealized gains (losses) included in earnings, Liabilities   1 0 1
Net realized/unrealized gains (losses) included in other comprehensive income, Liabilities   0 0 0
Purchases, Liabilities   (14) (11) (37)
Sales, Liabilities   0 0 0
Issuances, Liabilities   0 0 0
Settlements, Liabilities   4 10 8
Transfers out of Level 3 Due to Deconsolidation, Liabilities     30  
Fair Value, Liabilities, Ending balance 0 (28) 0 (28)
Net unrealized gains (losses) included in earnings still held, Liability   1 0 1
Trading Assets (excluding derivatives) [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Assets, Beginning balance       138
Net realized/unrealized gains (losses) included in earnings, Assets       1
Net realized/unrealized gains (losses) included in other comprehensive income, Assets       0
Purchases, Assets       0
Sales, Assets       (94)
Issuances, Assets       0
Settlements, Assets       (11)
Fair Value, Assets, Ending balance   34   34
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets       8
Trading Assets - Asset Backed Securities [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Assets, Beginning balance       94
Net realized/unrealized gains (losses) included in earnings, Assets       0
Net realized/unrealized gains (losses) included in other comprehensive income, Assets       0
Purchases, Assets       0
Sales, Assets       (94)
Issuances, Assets       0
Settlements, Assets       0
Fair Value, Assets, Ending balance   0   0
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets       0
Residential Mortgage Backed Securities [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Assets, Beginning balance   39 33 44
Net realized/unrealized gains (losses) included in earnings, Assets   (2) 2 1
Net realized/unrealized gains (losses) included in other comprehensive income, Assets   0 0 0
Purchases, Assets   0 0 0
Sales, Assets   0 0 0
Issuances, Assets   0 0 0
Settlements, Assets   (3) (4) (11)
Fair Value, Assets, Ending balance 0 34 0 34
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets   0 4 8
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Transfers out of Level 3 Due to Deconsolidation, Assets     31  
Debt Securities [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Assets, Beginning balance   68   1
Net realized/unrealized gains (losses) included in earnings, Assets   0   20
Net realized/unrealized gains (losses) included in other comprehensive income, Assets   (3)   14
Purchases, Assets   0   94
Sales, Assets   0   (64)
Issuances, Assets   0   0
Settlements, Assets   0   0
Fair Value, Assets, Ending balance   65   65
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets   0   0
Collateralized Mortgage Backed Securities [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Assets, Beginning balance   1   1
Net realized/unrealized gains (losses) included in earnings, Assets   0   0
Net realized/unrealized gains (losses) included in other comprehensive income, Assets   0   0
Purchases, Assets   0   0
Sales, Assets   0   0
Issuances, Assets   0   0
Settlements, Assets   0   0
Fair Value, Assets, Ending balance   1   1
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets   0   0
Asset-backed Securities [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Assets, Beginning balance 63 67 62 0
Net realized/unrealized gains (losses) included in earnings, Assets 4 0 4 20
Net realized/unrealized gains (losses) included in other comprehensive income, Assets 1 (3) 2 14
Purchases, Assets 0 0 0 94
Sales, Assets (11) 0 (11) (64)
Issuances, Assets 0 0 0 0
Settlements, Assets 0 0 0 0
Fair Value, Assets, Ending balance 57 64 57 64
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets 0 0 0 0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Transfers out of Level 3 Due to Deconsolidation, Assets     0  
Mortgage Loans Held-For-Sale [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Assets, Beginning balance   22 30 4
Net realized/unrealized gains (losses) included in earnings, Assets   (1) 0 (1)
Net realized/unrealized gains (losses) included in other comprehensive income, Assets   0 0 0
Purchases, Assets   14 12 37
Sales, Assets   0 0 (1)
Issuances, Assets   0 0 0
Settlements, Assets   (5) (11) (9)
Fair Value, Assets, Ending balance 0 30 0 30
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets   (1) 0 (1)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Transfers out of Level 3 Due to Deconsolidation, Assets     31  
Consumer Mortgage Finance Receivables And Loans [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Assets, Beginning balance   946 835 1,015
Net realized/unrealized gains (losses) included in earnings, Assets   57 121 231
Net realized/unrealized gains (losses) included in other comprehensive income, Assets   0 0 1
Purchases, Assets   0 0 0
Sales, Assets   0 (245) 0
Issuances, Assets   0 0 0
Settlements, Assets   (162) (124) (406)
Fair Value, Assets, Ending balance 0 841 0 841
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets   4 51 70
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Transfers out of Level 3 Due to Deconsolidation, Assets     587  
Mortgage Servicing Rights [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Assets, Beginning balance 1,105 3,701 2,519 3,738
Net realized/unrealized gains (losses) included in earnings, Assets (253) (1,212) (654) (1,327)
Net realized/unrealized gains (losses) included in other comprehensive income, Assets 0 0 0 0
Purchases, Assets 0 15 0 31
Sales, Assets 0 0 0 (266)
Issuances, Assets 50 159 167 487
Settlements, Assets 0 0 0 0
Fair Value, Assets, Ending balance 902 2,663 902 2,663
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets (253) (1,212) (654) (1,327)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Transfers out of Level 3 Due to Deconsolidation, Assets     1,130  
Retained Interest [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Assets, Beginning balance 193 307 231 568
Net realized/unrealized gains (losses) included in earnings, Assets 11 10 38 167
Net realized/unrealized gains (losses) included in other comprehensive income, Assets 0 0 0 0
Purchases, Assets 0 0 0 0
Sales, Assets 0 0 0 0
Issuances, Assets 0 2 0 3
Settlements, Assets (39) (22) (104) (441)
Fair Value, Assets, Ending balance 165 297 165 297
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets 0 (6) 0 (14)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Transfers out of Level 3 Due to Deconsolidation, Assets     0  
Derivative Financial Instruments, Assets [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Assets, Beginning balance 100 87 87 (13)
Net realized/unrealized gains (losses) included in earnings, Assets 26 61 290 190
Net realized/unrealized gains (losses) included in other comprehensive income, Assets 0 0 0 0
Purchases, Assets 0 0 0 0
Sales, Assets 0 0 0 0
Issuances, Assets 0 0 0 0
Settlements, Assets (2) (6) (252) (35)
Fair Value, Assets, Ending balance 124 142 124 142
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets (11) 117 (39) 215
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Transfers out of Level 3 Due to Deconsolidation, Assets     1  
Interest Rate Contract [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Assets, Beginning balance 93 87 71 (13)
Net realized/unrealized gains (losses) included in earnings, Assets 53 59 326 188
Net realized/unrealized gains (losses) included in other comprehensive income, Assets 0 0 0 0
Purchases, Assets 0 0 0 0
Sales, Assets 0 0 0 0
Issuances, Assets 0 0 0 0
Settlements, Assets (2) (6) (252) (35)
Fair Value, Assets, Ending balance 144 140 144 140
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets 16 115 10 213
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Transfers out of Level 3 Due to Deconsolidation, Assets     1  
Foreign Exchange Contract [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Assets, Beginning balance 7 0 16 0
Net realized/unrealized gains (losses) included in earnings, Assets (27) 2 (36) 2
Net realized/unrealized gains (losses) included in other comprehensive income, Assets 0 0 0 0
Purchases, Assets 0 0 0 0
Sales, Assets 0 0 0 0
Issuances, Assets 0 0 0 0
Settlements, Assets 0 0 0 0
Fair Value, Assets, Ending balance (20) 2 (20) 2
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets (27) 2 (49) 2
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Transfers out of Level 3 Due to Deconsolidation, Assets     $ 0