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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
Mar. 31, 2013
Mar. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value, Assets, Beginning balance $ 1,151 $ 3,797
Net realized/unrealized gains (losses) included in earnings, Assets (131) 60
Net realized/unrealized gains (losses) included in other comprehensive income, Assets 0 1
Purchases, Assets 0 9
Sales, Assets 0 0
Issuances, Assets 54 11
Settlements, Assets (13) (83)
Fair Value, Assets, Ending balance 1,061 3,795
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets (99) 1
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value, Liabilities, Beginning balance   (859)
Net realized/unrealized gains (losses) included in earnings, Liabilities   (83)
Net realized/unrealized gains (losses) included in other comprehensive income, Liabilities   0
Purchases, Liabilities   (9)
Sales, Liabilities   0
Issuances, Liabilities   0
Settlements, Liabilities   93
Fair Value, Liabilities, Ending balance   (858)
Net unrealized gains (losses) included in earnings still held, Liability   (39)
On-Balance Sheet Securitization Debt [Member]
   
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value, Liabilities, Beginning balance   (830)
Net realized/unrealized gains (losses) included in earnings, Liabilities   (83)
Net realized/unrealized gains (losses) included in other comprehensive income, Liabilities   0
Purchases, Liabilities   0
Sales, Liabilities   0
Issuances, Liabilities   0
Settlements, Liabilities   85
Fair Value, Liabilities, Ending balance   (828)
Net unrealized gains (losses) included in earnings still held, Liability   (39)
Loan repurchase liabilities [Member]
   
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value, Liabilities, Beginning balance   (29)
Net realized/unrealized gains (losses) included in earnings, Liabilities   0
Net realized/unrealized gains (losses) included in other comprehensive income, Liabilities   0
Purchases, Liabilities   (9)
Sales, Liabilities   0
Issuances, Liabilities   0
Settlements, Liabilities   8
Fair Value, Liabilities, Ending balance   (30)
Net unrealized gains (losses) included in earnings still held, Liability   0
Residential Mortgage Backed Securities [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value, Assets, Beginning balance   33
Net realized/unrealized gains (losses) included in earnings, Assets   2
Net realized/unrealized gains (losses) included in other comprehensive income, Assets   0
Purchases, Assets   0
Sales, Assets   0
Issuances, Assets   0
Settlements, Assets   (3)
Fair Value, Assets, Ending balance   32
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets   4
Asset-backed Securities [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value, Assets, Beginning balance   62
Net realized/unrealized gains (losses) included in earnings, Assets   0
Net realized/unrealized gains (losses) included in other comprehensive income, Assets   1
Purchases, Assets   0
Sales, Assets   0
Issuances, Assets   0
Settlements, Assets   0
Fair Value, Assets, Ending balance   63
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, 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   30
Net realized/unrealized gains (losses) included in earnings, Assets   0
Net realized/unrealized gains (losses) included in other comprehensive income, Assets   0
Purchases, Assets   9
Sales, Assets   0
Issuances, Assets   0
Settlements, Assets   (9)
Fair Value, Assets, Ending balance   30
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets   0
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
Net realized/unrealized gains (losses) included in earnings, Assets   87
Net realized/unrealized gains (losses) included in other comprehensive income, Assets   0
Purchases, Assets   0
Sales, Assets   0
Issuances, Assets   0
Settlements, Assets   (90)
Fair Value, Assets, Ending balance   832
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets   35
Mortgage Servicing Rights [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value, Assets, Beginning balance 952 2,519
Net realized/unrealized gains (losses) included in earnings, Assets (89) (10)
Net realized/unrealized gains (losses) included in other comprehensive income, Assets 0 0
Purchases, Assets 0 0
Sales, Assets 0 0
Issuances, Assets 54 11
Settlements, Assets 0 64
Fair Value, Assets, Ending balance 917 2,595
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets (89) 1
Retained Interest [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value, Assets, Beginning balance 154 231
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 (17) (42)
Fair Value, Assets, Ending balance 139 194
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets 0 0
Derivative Financial Instruments, Assets [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value, Assets, Beginning balance 45 87
Net realized/unrealized gains (losses) included in earnings, Assets (44) (35)
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 (3)
Fair Value, Assets, Ending balance 5 49
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets (10) (39)
Interest Rate Contract [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value, Assets, Beginning balance 47 71
Net realized/unrealized gains (losses) included in earnings, Assets (46) (24)
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 (3)
Fair Value, Assets, Ending balance 5 44
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets (9) (28)
Foreign Exchange Contract [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value, Assets, Beginning balance (2) 16
Net realized/unrealized gains (losses) included in earnings, Assets 2 (11)
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 0 5
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets (1) (11)
Fair Value, Inputs, Level 3 [Member] | Mortgage Servicing Rights [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Net realized/unrealized gains (losses) included in earnings, Assets $ (89) $ 1