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Derivative Instruments and Hedging Activities (Details - Fair Value Hedge) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]      
Fair Value Hedge, Hedging Instrument $ 37 $ 70 $ (7)
Fair Value Hedge, Hedged Item (51) (76) 6
Fair Value Hedge, Hedge Ineffectiveness (14) (6) (1)
Agency Debentures [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Fair Value Hedge, Hedging Instrument 1 28 (3)
Fair Value Hedge, Hedged Item (3) (32) 3
Fair Value Hedge, Hedge Ineffectiveness (2) (4) 0
Agency mortgage-backed securities [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Fair Value Hedge, Hedging Instrument 36 42 (4)
Fair Value Hedge, Hedged Item (48) (44) 3
Fair Value Hedge, Hedge Ineffectiveness $ (12) $ (2) $ (1)