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Derivative Instruments Derivatives 2 - FV Gains and Losses (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative fair value gains (losses), net $ (38) $ (494) $ 825 $ (462)
Net accrual of periodic settlements 5,377 5,002 10,609 10,348
Pay-fixed Swap        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative fair value gains (losses), net 967 (691) 3,750 0
Receive-fixed Swap        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative fair value gains (losses), net (597) 639 (2,984) 322
Basis Swap        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative fair value gains (losses), net (3) 16 (26) 23
Foreign Currency Swap        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative fair value gains (losses), net (41) 11 (25) 23
Pay-fixed Swaption        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative fair value gains (losses), net 36 (48) 165 (48)
Receive-fixed Swaption        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative fair value gains (losses), net (22) (8) (38) (26)
Other        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative fair value gains (losses), net (16) 3 (4) (5)
Risk Management Derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative fair value gains (losses), net 38 (302) 337 (190)
Net accrual of periodic settlements (286) (224) (501) (479)
Mortgage commitment derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative fair value gains (losses), net $ (76) $ (192) $ 488 $ (272)