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Fair Value (Fair Value Measurement - Reconciliation of Level 3 Assets And Liabilities) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, Assets, Beginning balance $ 3,797 $ 5,451  
Net realized/unrealized gains (losses) included in earnings, Assets (599) (888)  
Net realized/unrealized gains (losses) included in other comprehensive income, Assets (12) 15  
Purchases, Assets 12 171  
Sales, Assets (314) (426)  
Issuances, Assets 240 625  
Settlements, Assets (209) (1,128)  
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets (1,764) (23)  
Fair Value, Assets, Ending balance 1,151 3,797  
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets (671) (1,311)  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, Liabilities, Beginning balance (859) (972)  
Net realized/unrealized gains (losses) included in earnings, Liabilities (115) (369)  
Net realized/unrealized gains (losses) included in other comprehensive income, Liabilities 0 1  
Purchases, Liabilities (11) (46)  
Sales, Liabilities 0 0  
Issuances, Liabilities 0 0  
Settlements, Liabilities 399 527  
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Liabilities 586 0  
Fair Value, Liabilities, Ending balance 0 (859)  
Net unrealized gains (losses) included in earnings still held, Liability (62) (182)  
On-Balance Sheet Securitization Debt [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets   0  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, Liabilities, Beginning balance (830) (972)  
Net realized/unrealized gains (losses) included in earnings, Liabilities (115) (371)  
Net realized/unrealized gains (losses) included in other comprehensive income, Liabilities 0 1  
Purchases, Liabilities 0 0  
Sales, Liabilities 0 0  
Issuances, Liabilities 0 0  
Settlements, Liabilities 389 512  
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Liabilities 556    
Fair Value, Liabilities, Ending balance 0 (830)  
Net unrealized gains (losses) included in earnings still held, Liability (62) (184)  
Loan repurchase liabilities [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets   0  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, Liabilities, Beginning balance (29) 0  
Net realized/unrealized gains (losses) included in earnings, Liabilities 0 2  
Net realized/unrealized gains (losses) included in other comprehensive income, Liabilities 0 0  
Purchases, Liabilities (11) (46)  
Sales, Liabilities 0 0  
Issuances, Liabilities 0 0  
Settlements, Liabilities 10 15  
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Liabilities 30    
Fair Value, Liabilities, Ending balance 0 (29)  
Net unrealized gains (losses) included in earnings still held, Liability 0 2  
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   5  
Net realized/unrealized gains (losses) included in other comprehensive income, Assets   0  
Purchases, Assets   0  
Sales, Assets   (94)  
Issuances, Assets   0  
Settlements, Assets   (16)  
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets   0  
Fair Value, Assets, Ending balance   33  
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets   14  
Residential Mortgage Backed Securities [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, Assets, Beginning balance 33 44  
Net realized/unrealized gains (losses) included in earnings, Assets 2 5  
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 (4) (16)  
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets (31) 0  
Fair Value, Assets, Ending balance 0 33  
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets 4 14  
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  
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets   0  
Fair Value, Assets, Ending balance   0  
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets   0  
Debt Securities [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, Assets, Beginning balance   1  
Net realized/unrealized gains (losses) included in earnings, Assets   18  
Net realized/unrealized gains (losses) included in other comprehensive income, Assets   14  
Purchases, Assets   94  
Sales, Assets   (65)  
Issuances, Assets   0  
Settlements, Assets   0  
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets   0  
Fair Value, Assets, Ending balance   62  
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets   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  
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   (1)  
Issuances, Assets   0  
Settlements, Assets   0  
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets   0  
Fair Value, Assets, Ending balance   0  
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets   0  
Asset-backed Securities [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, Assets, Beginning balance 62 0  
Net realized/unrealized gains (losses) included in earnings, Assets 19 18  
Net realized/unrealized gains (losses) included in other comprehensive income, Assets (12) 14  
Purchases, Assets 0 94  
Sales, Assets (69) (64)  
Issuances, Assets 0 0  
Settlements, Assets 0 0  
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets 0 0  
Fair Value, Assets, Ending balance 0 62  
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets 0 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 30 4  
Net realized/unrealized gains (losses) included in earnings, Assets 0 (1)  
Net realized/unrealized gains (losses) included in other comprehensive income, Assets 0 0  
Purchases, Assets 12 46  
Sales, Assets 0 (1)  
Issuances, Assets 0 0  
Settlements, Assets (11) (18)  
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets (31) 0  
Fair Value, Assets, Ending balance 0 30  
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets 0 (2)  
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 835 1,015  
Net realized/unrealized gains (losses) included in earnings, Assets 121 352  
Net realized/unrealized gains (losses) included in other comprehensive income, Assets 0 1  
Purchases, Assets 0 0  
Sales, Assets (245) 0  
Issuances, Assets 0 0  
Settlements, Assets (124) (533)  
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets (587) 0  
Fair Value, Assets, Ending balance 0 835  
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets 51 136  
Mortgage Servicing Rights [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, Assets, Beginning balance 2,519 3,738  
Net realized/unrealized gains (losses) included in earnings, Assets (677) (1,606) (872)
Net realized/unrealized gains (losses) included in other comprehensive income, Assets 0 0  
Purchases, Assets 0 31  
Sales, Assets 0 (266)  
Issuances, Assets 240 622  
Settlements, Assets 0 0  
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets (1,130) 0  
Fair Value, Assets, Ending balance 952 2,519 3,738
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets (677) (1,605)  
Retained Interest [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, Assets, Beginning balance 231 568  
Net realized/unrealized gains (losses) included in earnings, Assets 46 180  
Net realized/unrealized gains (losses) included in other comprehensive income, Assets 0 0  
Purchases, Assets 0 0  
Sales, Assets 0 0  
Issuances, Assets 0 3  
Settlements, Assets (123) (520)  
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets 0 0  
Fair Value, Assets, Ending balance 154 231  
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets 0 (15)  
Derivative Financial Instruments, Assets [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, Assets, Beginning balance 87 (13)  
Net realized/unrealized gains (losses) included in earnings, Assets (110) 164  
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 53 (41)  
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets 15 (23)  
Fair Value, Assets, Ending balance 45 87  
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets (49) 161  
Interest Rate Contract [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, Assets, Beginning balance 71 (13)  
Net realized/unrealized gains (losses) included in earnings, Assets (78) 148  
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 53 (41)  
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets 1 (23)  
Fair Value, Assets, Ending balance 47 71  
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets 1 145  
Foreign Exchange Contract [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, Assets, Beginning balance 16 0  
Net realized/unrealized gains (losses) included in earnings, Assets (32) 16  
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  
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets 14 0  
Fair Value, Assets, Ending balance (2) 16  
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets $ (50) $ 16