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Fair Values of Assets and Liabilities (Details 3) (USD $)
In Millions, unless otherwise specified
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, 2012
Residential Non-agency Prime [Member]
Jun. 30, 2011
Residential Non-agency Prime [Member]
Jun. 30, 2012
Residential Non-agency Prime [Member]
Jun. 30, 2011
Residential Non-agency Prime [Member]
Jun. 30, 2012
Residential Non-agency Non-Prime [Member]
Jun. 30, 2011
Residential Non-agency Non-Prime [Member]
Jun. 30, 2012
Residential Non-agency Non-Prime [Member]
Jun. 30, 2011
Residential Non-agency Non-Prime [Member]
Jun. 30, 2012
Commercial Mortgage-backed Non-Agency Securities [Member]
Jun. 30, 2011
Commercial Mortgage-backed Non-Agency Securities [Member]
Jun. 30, 2012
Commercial Mortgage-backed Non-Agency Securities [Member]
Jun. 30, 2011
Commercial Mortgage-backed Non-Agency Securities [Member]
Jun. 30, 2012
Collateralized Loan Obligations [Member]
Jun. 30, 2011
Collateralized Loan Obligations [Member]
Jun. 30, 2012
Collateralized Loan Obligations [Member]
Jun. 30, 2011
Collateralized Loan Obligations [Member]
Jun. 30, 2012
Other [Member]
Jun. 30, 2011
Other [Member]
Jun. 30, 2012
Other [Member]
Jun. 30, 2011
Other [Member]
Jun. 30, 2012
Corporate Debt Securities [Member]
Mar. 31, 2012
Corporate Debt Securities [Member]
Dec. 31, 2011
Corporate Debt Securities [Member]
Jun. 30, 2011
Corporate Debt Securities [Member]
Mar. 31, 2011
Corporate Debt Securities [Member]
Dec. 31, 2010
Corporate Debt Securities [Member]
Jun. 30, 2012
Available for Sale Securities [Member]
Jun. 30, 2011
Available for Sale Securities [Member]
Jun. 30, 2012
Available for Sale Securities [Member]
Jun. 30, 2011
Available for Sale Securities [Member]
Jun. 30, 2012
Mortgage servicing rights [Member]
Jun. 30, 2011
Mortgage servicing rights [Member]
Jun. 30, 2012
Mortgage servicing rights [Member]
Jun. 30, 2011
Mortgage servicing rights [Member]
Jun. 30, 2012
Net derivative assets and liabilities [Member]
Jun. 30, 2011
Net derivative assets and liabilities [Member]
Jun. 30, 2012
Net derivative assets and liabilities [Member]
Jun. 30, 2011
Net derivative assets and liabilities [Member]
Changes in fair value for all assets and liabilities measured at fair value                                                                            
Beginning of period balance $ 733 $ 963 $ 803 $ 1,103 $ 806 $ 947 $ 802 $ 947 $ 40 $ 50 $ 42 $ 50 $ 119 $ 142 $ 120 $ 135 $ 112 $ 133 $ 117 $ 133 $ 9 $ 9 $ 9 $ 9 $ 9 $ 9 $ 1,819 $ 2,244 $ 1,893 $ 2,377 $ 1,737 $ 2,073 $ 1,519 $ 1,837 $ 1,089 $ 747 $ 1,228 $ 851
Net Gains (Losses) Included in Net Income (1) 1 (1) 3 (7) (2) (10) (2) 1 1 1 1 5 3 10 7 3 3 6 7             1 6 6 16 (374) (190) (430) (174) 876 373 1,207 416
Net Gains (Losses) Included in Other Comprehensive Income (Loss) 21 (22) 37 24 28 (19) 65 32 (2) (1) (2)      (1) (1) 8 3 (1) 4 2             50 (44) 103 66                
Sales      (48) (115)        (12)         (7)   (7)                       (7)    (55) (127)         (2) (2) (2) (3)
Principal Payments (40) (46) (78) (119) (31) (31) (61) (70) (2)   (4) (1) (15) (11) (20) (17) (6) (6) (15) (13)             (94) (94) (178) (220)                
Settlements                                                                     (603) (282) (1,073) (428)
Purchases                                                             16 4 29 11        
Issuances                                                             215 102 476 315        
End of Period Balance 713 896 713 896 796 895 796 895 37 50 37 50 102 133 102 133 112 129 112 129 9 9 9 9 9 9 1,769 2,112 1,769 2,112 1,594 1,989 1,594 1,989 1,360 836 1,360 836
Net Change in Unrealized Gains (Losses) Relating to Assets Still Held at End of Period $ 20 $ (22) $ 33 $ 16 $ 28 $ (19) $ 65 $ 31 $ (1)   $ (2)       $ 1 $ 9 $ 3 $ (1) $ 4 $ 2             $ 50 $ (42) $ 101 $ 58 $ (374) $ (190) $ (430) $ (174) $ (389) $ (30) $ (850) $ (169)