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Derivative Instruments Derivatives 2 - FV Gains and Losses (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative fair value gains (losses), net $ (480) $ 544 $ (3,011) $ 2,294
Accrual of periodic settlements 5,184 5,582 [1] 14,826 17,553 [1]
Risk Management Derivatives [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative fair value gains (losses), net (407) 713 (2,283) 1,835
Mortgage commitment derivatives [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative fair value gains (losses), net (73) (169) (728) 459
Pay-fixed Swap [Member] | Risk Management Derivatives [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative fair value gains (losses), net 712 976 (3,755) 11,879
Accrual of periodic settlements (939) (1,141) (2,755) (3,550)
Receive-fixed Swap [Member] | Risk Management Derivatives [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative fair value gains (losses), net (822) (217) 2,282 (9,250)
Accrual of periodic settlements 613 897 1,946 2,891
Basis Swap [Member] | Risk Management Derivatives [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative fair value gains (losses), net 6 (13) 49 (85)
Foreign Currency Swap [Member] | Risk Management Derivatives [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative fair value gains (losses), net (17) 54 21 (79)
Pay-fixed Swaption [Member] | Risk Management Derivatives [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative fair value gains (losses), net (53) 148 (90) (303)
Receive-fixed Swaption [Member] | Risk Management Derivatives [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative fair value gains (losses), net 82 (3) (19) 265
Other [Member] | Risk Management Derivatives [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative fair value gains (losses), net (1) (3) (1) 18
Accrual of periodic settlements $ 12 $ 15 $ 39 $ 49
[1] Certain prior period amounts have been reclassified to conform to our current period presentation.