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Derivative Instruments Derivatives 2 - FV Gains and Losses (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]                      
Derivative fair value gains (losses), net                 $ (1,185) $ (835) $ (1,513)
Net accrual of periodic settlements $ 5,111 $ 5,274 $ 5,002 $ 5,346 $ 5,805 $ 5,435 $ 5,286 $ 4,769 20,733 21,295 21,409
Pay-fixed swap                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Derivative fair value gains (losses), net                 1,296 757 (746)
Receive-fixed Swap                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Derivative fair value gains (losses), net                 (851) (751) 625
Basis swap                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Derivative fair value gains (losses), net                 21 (21) 4
Foreign currency swap                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Derivative fair value gains (losses), net                 49 (76) (60)
Pay-fixed swaption                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Derivative fair value gains (losses), net                 (161) 163 135
Receive-fixed swaption                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Derivative fair value gains (losses), net                 (60) (230) (93)
Other                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Derivative fair value gains (losses), net                 13 160 (25)
Risk management derivatives                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Derivative fair value gains (losses), net                 (582) (1,123) (1,120)
Net accrual of periodic settlements                 (889) (1,125) (960)
Mortgage commitment derivatives                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Derivative fair value gains (losses), net                 $ (603) $ 288 $ (393)