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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Assets, Beginning balance $ 1,061 $ 3,795 $ 1,151 $ 3,797
Net realized/unrealized gains (losses) included in earnings, Assets (17) (47) (148) 13
Net realized/unrealized gains (losses) included in other comprehensive income, Assets 0 0 0 1
Purchases, Assets 0 3 0 12
Sales, Assets (911) (245) (911) (245)
Issuances, Assets 6 42 60 53
Settlements, Assets (24) (307) (37) (390)
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets   (1,780)   (1,780)
Fair Value, Assets, Ending balance 115 1,461 115 1,461
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets (26) (375) (125) (374)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Liabilities, Beginning balance   (858)   (859)
Net realized/unrealized gains (losses) included in earnings, Liabilities   (32)   (115)
Net realized/unrealized gains (losses) included in other comprehensive income, Liabilities   0   0
Purchases, Liabilities   (2)   (11)
Sales, Liabilities   0   0
Issuances, Liabilities   0   0
Settlements, Liabilities   306   399
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Liabilities   586   586
Fair Value, Liabilities, Ending balance   0   0
Net unrealized gains (losses) included in earnings still held, Liability   (23)   (62)
On-Balance Sheet Securitization Debt [Member]
       
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Liabilities, Beginning balance   (828)   (830)
Net realized/unrealized gains (losses) included in earnings, Liabilities   (32)   (115)
Net realized/unrealized gains (losses) included in other comprehensive income, Liabilities   0   0
Purchases, Liabilities   0   0
Sales, Liabilities   0   0
Issuances, Liabilities   0   0
Settlements, Liabilities   304   389
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Liabilities   556   556
Fair Value, Liabilities, Ending balance   0   0
Net unrealized gains (losses) included in earnings still held, Liability   (23)   (62)
Loan repurchase liabilities [Member]
       
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Liabilities, Beginning balance   (30)   (29)
Net realized/unrealized gains (losses) included in earnings, Liabilities   0   0
Net realized/unrealized gains (losses) included in other comprehensive income, Liabilities   0   0
Purchases, Liabilities   (2)   (11)
Sales, Liabilities   0   0
Issuances, Liabilities   0   0
Settlements, Liabilities   2   10
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Liabilities   30   30
Fair Value, Liabilities, Ending balance   0   0
Net unrealized gains (losses) included in earnings still held, Liability   0   0
Residential Mortgage Backed Securities [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Assets, Beginning balance   32   33
Net realized/unrealized gains (losses) included in earnings, Assets   0   2
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   (1)   (4)
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets   (31)   (31)
Fair Value, Assets, Ending balance   0   0
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets   0   4
Asset-backed Securities [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Assets, Beginning balance   63   62
Net realized/unrealized gains (losses) included in earnings, Assets   0   0
Net realized/unrealized gains (losses) included in other comprehensive income, Assets   0   1
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   0   0
Fair Value, Assets, Ending balance   63   63
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   30
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   3   12
Sales, Assets   0   0
Issuances, Assets   0   0
Settlements, Assets   (2)   (11)
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets   (31)   (31)
Fair Value, Assets, Ending balance   0   0
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets   0   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   832   835
Net realized/unrealized gains (losses) included in earnings, Assets   34   121
Net realized/unrealized gains (losses) included in other comprehensive income, Assets   0   0
Purchases, Assets   0   0
Sales, Assets   (245)   (245)
Issuances, Assets   0   0
Settlements, Assets   (34)   (124)
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets   (587)   (587)
Fair Value, Assets, Ending balance   0   0
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets   16   51
Mortgage Servicing Rights [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Assets, Beginning balance 917 2,595 952 2,519
Net realized/unrealized gains (losses) included in earnings, Assets (12) (275) (101) (285)
Net realized/unrealized gains (losses) included in other comprehensive income, Assets 0 0 0 0
Purchases, Assets 0 0 0 0
Sales, Assets (911) 0 (911) 0
Issuances, Assets 6 42 60 53
Settlements, Assets 0 0 0 64
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets   (1,130)   (1,130)
Fair Value, Assets, Ending balance 0 1,105 0 1,105
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets (12) (402) (101) (401)
Retained Interest [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Assets, Beginning balance 139 194 154 231
Net realized/unrealized gains (losses) included in earnings, Assets 9 22 11 27
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 (24) (23) (41) (65)
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets   0   0
Fair Value, Assets, Ending balance 124 193 124 193
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets 0 0 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 5 49 45 87
Net realized/unrealized gains (losses) included in earnings, Assets (14) 299 (58) 264
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 (247) 4 (250)
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets   (1)   (1)
Fair Value, Assets, Ending balance (9) 100 (9) 100
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets (14) 11 (24) (28)
Interest Rate Contract [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Assets, Beginning balance 5 44 47 71
Net realized/unrealized gains (losses) included in earnings, Assets (5) 297 (51) 273
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 (247) 4 (250)
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets   (1)   (1)
Fair Value, Assets, Ending balance 0 93 0 93
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets (6) 22 (15) (6)
Foreign Exchange Contract [Member]
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Assets, Beginning balance 0 5 (2) 16
Net realized/unrealized gains (losses) included in earnings, Assets (9) 2 (7) (9)
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
Transfers out of Level 3 Due to Deconsolidation or Discontinued Operations, Assets   0   0
Fair Value, Assets, Ending balance (9) 7 (9) 7
Net Unrealized Gains (Losses) Included In Earnings Related to Instruments Still Held, Assets (8) (11) (9) (22)
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 $ (12) $ (402) $ (101) $ (401)