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Derivative Instruments Derivatives 2 - FV Gains and Losses (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative fair value gains (losses), net $ (1,285) $ 562
Accrual of periodic settlements 4,738 6,304 [1]
Risk Management Derivatives [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative fair value gains (losses), net (940) 431
Mortgage commitment derivatives [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative fair value gains (losses), net (345) 131
Pay-fixed Swap [Member] | Risk Management Derivatives [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative fair value gains (losses), net (2,118) 2,590
Accrual of periodic settlements (903) (1,198)
Receive-fixed Swap [Member] | Risk Management Derivatives [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative fair value gains (losses), net 1,465 (1,910)
Accrual of periodic settlements 691 982
Basis Swap [Member] | Risk Management Derivatives [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative fair value gains (losses), net 35 (27)
Accrual of periodic settlements 9 10
Foreign Currency Swap [Member] | Risk Management Derivatives [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative fair value gains (losses), net 21 (70)
Accrual of periodic settlements 4 4
Pay-fixed Swaption [Member] | Risk Management Derivatives [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative fair value gains (losses), net (99) 17
Receive-fixed Swaption [Member] | Risk Management Derivatives [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative fair value gains (losses), net (42) 21
Other [Member] | Risk Management Derivatives [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative fair value gains (losses), net (3) [2] 10 [2]
Accrual of periodic settlements $ 0 [2] $ 2 [2]
[1] Certain prior period amounts have been reclassified to conform with the current period presentation.
[2] Includes interest rate caps, futures, swap credit enhancements and mortgage insurance contracts.