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Held-to-maturity Securities (Details - OTTI) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities, less than twelve months, fair value $ 10,952 $ 7,686
Held-to-maturity securities, twelve months or longer, fair value 6,260 1,290
Held-to-maturity securities, fair value 17,212 8,976
Held-to-maturity securities, less than twelve months, aggregate losses (83) (155)
Held-to-maturity securities, twelve months or longer, aggregate losses (147) (29)
Held-to-maturity securities, aggregate losses (230) (184)
Agency Mortgage-Backed Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities, less than twelve months, fair value 9,982 5,929
Held-to-maturity securities, twelve months or longer, fair value 4,906 1,272
Held-to-maturity securities, fair value 14,888 7,201
Held-to-maturity securities, less than twelve months, aggregate losses (78) (123)
Held-to-maturity securities, twelve months or longer, aggregate losses (115) (29)
Held-to-maturity securities, aggregate losses (193) (152)
Agency Debentures [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities, less than twelve months, fair value 597 18
Held-to-maturity securities, twelve months or longer, fair value 9  
Held-to-maturity securities, fair value 606 18
Held-to-maturity securities, less than twelve months, aggregate losses (2) 0
Held-to-maturity securities, twelve months or longer, aggregate losses 0  
Held-to-maturity securities, aggregate losses (2) 0
Agency Debt Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities, less than twelve months, fair value 373 1,739
Held-to-maturity securities, twelve months or longer, fair value 1,345 18
Held-to-maturity securities, fair value 1,718 1,757
Held-to-maturity securities, less than twelve months, aggregate losses (3) (32)
Held-to-maturity securities, twelve months or longer, aggregate losses (32) 0
Held-to-maturity securities, aggregate losses $ (35) $ (32)