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Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) (USD $)
In Millions
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, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2010
Available-for-sale Securities
Jun. 30, 2010
Available-for-sale Securities
Jun. 30, 2011
Available-for-sale Securities
Mar. 31, 2011
Available-for-sale Securities
Dec. 31, 2010
Available-for-sale Securities
Jun. 30, 2010
Available-for-sale Securities
Mortgage backed securities
Jun. 30, 2010
Available-for-sale Securities
Mortgage backed securities
Jun. 30, 2011
Available-for-sale Securities
Mortgage backed securities
Mar. 31, 2011
Available-for-sale Securities
Mortgage backed securities
Dec. 31, 2010
Available-for-sale Securities
Mortgage backed securities
Jun. 30, 2011
Mortgage backed securities
Trading account securities
Jun. 30, 2010
Mortgage backed securities
Trading account securities
Jun. 30, 2011
Mortgage backed securities
Trading account securities
Jun. 30, 2010
Mortgage backed securities
Trading account securities
Jun. 30, 2011
Other
Trading account securities
Jun. 30, 2011
Other
Trading account securities
Jun. 30, 2010
Other
Trading account securities
Mar. 31, 2010
Other
Trading account securities
Dec. 31, 2009
Other
Trading account securities
Jun. 30, 2011
Trading account securities
Jun. 30, 2010
Trading account securities
Jun. 30, 2011
Trading account securities
Jun. 30, 2010
Trading account securities
Jun. 30, 2011
Trading account securities
Collateralized Mortgage Obligations
Mar. 31, 2011
Trading account securities
Collateralized Mortgage Obligations
Dec. 31, 2010
Trading account securities
Collateralized Mortgage Obligations
Jun. 30, 2010
Trading account securities
Collateralized Mortgage Obligations
Mar. 31, 2010
Trading account securities
Collateralized Mortgage Obligations
Dec. 31, 2009
Trading account securities
Collateralized Mortgage Obligations
Jun. 30, 2011
Servicing Asset At Fair Value Amount
Jun. 30, 2010
Servicing Asset At Fair Value Amount
Jun. 30, 2011
Servicing Asset At Fair Value Amount
Jun. 30, 2010
Servicing Asset At Fair Value Amount
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                                                                          
Beginning Balance $ 203 $ 412 $ 201 $ 434 $ 36 $ 34 $ 8 $ 8 $ 8 $ 36 $ 34 $ 8 $ 8 $ 8 $ 21 $ 197 $ 20 $ 224 $ 3 $ 3 $ 3 $ 3 $ 3 $ 27 $ 203 $ 26 $ 230 $ 3 $ 3 $ 3 $ 3 $ 3 $ 3 $ 168 $ 173 $ 167 $ 170
Gains (losses) included in earnings/OCI (9) (14) (15) (15)                     1 (5) 1 (5)           1 (5) 1 (5)             (10) (9) (16) (10)
Issuances       2   2         2                                                    
Purchases 14 12 23 26                     8 4 10 14 1 1       9 4 11 14             5 8 12 12
Sales (3) (4) (4) (37)                     (2) (4) (3) (37) (1) (1)       (3) (4) (4) (37)                    
Paydowns   (3)   (7) (1) (1)       (1) (1)         (2)   (6)             (2)   (6)                    
Settlements (1)   (1)                       (1)   (1)             (1)   (1)                      
Transfers in (out) of Level 3   (79)   (79) (3) (3)       (3) (3)         (76)   (76)             (76)   (76)                    
Ending Balance 204 324 204 324 32 32 8 8 8 32 32 8 8 8 27 114 27 114 3 3 3 3 3 33 120 33 120 3 3 3 3 3 3 163 172 163 172
Changes in unrealized gains (losses) included in earnings/OCI related to assets still held $ (5) $ (4) $ (7) $ (1)                       $ 1   $ 1 $ 1 $ 1       $ 1 [1] $ 1 [1] $ 1 [1] $ 1 [1]             $ (6) [2] $ (5) [2] $ (8) [2] $ (2) [2]
[1] Gains (losses) are included in "Trading account profit" in the Statement of Operations.
[2] Gains (losses) are included in "Other services fees" in the Statement of Operations.