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Available-for-Sale Securities (Details - OTTI) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, less than twelve months, fair value $ 4,654 $ 10,186
Available-for-sale securities, twelve months or longer, fair value 8,492 1,620
Available-for-sale securities, fair value 13,146 11,806
Available-for-sale securities, less than twelve months, aggregate losses (23) (346)
Available-for-sale securities, twelve months or longer, aggregate losses (241) (57)
Available-for-sale securities, aggregate losses (264) (403)
Agency Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, less than twelve months, fair value 4,638 9,281
Available-for-sale securities, twelve months or longer, fair value 8,027 1,620
Available-for-sale securities, fair value 12,665 10,901
Available-for-sale securities, less than twelve months, aggregate losses (23) (279)
Available-for-sale securities, twelve months or longer, aggregate losses (224) (57)
Available-for-sale securities, aggregate losses (247) (336)
Agency Debentures [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, less than twelve months, fair value 0 454
Available-for-sale securities, twelve months or longer, fair value 283 0
Available-for-sale securities, fair value 283 454
Available-for-sale securities, less than twelve months, aggregate losses 0 (21)
Available-for-sale securities, twelve months or longer, aggregate losses (12) 0
Available-for-sale securities, aggregate losses (12) (21)
U.S. Treasuries [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, less than twelve months, fair value 0 407
Available-for-sale securities, twelve months or longer, fair value 147  
Available-for-sale securities, fair value 147 407
Available-for-sale securities, less than twelve months, aggregate losses 0 (45)
Available-for-sale securities, twelve months or longer, aggregate losses (4)  
Available-for-sale securities, aggregate losses (4) (45)
Agency Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, less than twelve months, fair value 9 24
Available-for-sale securities, twelve months or longer, fair value 24 0
Available-for-sale securities, fair value 33 24
Available-for-sale securities, less than twelve months, aggregate losses 0 (1)
Available-for-sale securities, twelve months or longer, aggregate losses (1) 0
Available-for-sale securities, aggregate losses (1) (1)
Municipal Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, less than twelve months, fair value 0 13
Available-for-sale securities, twelve months or longer, fair value 11 0
Available-for-sale securities, fair value 11 13
Available-for-sale securities, less than twelve months, aggregate losses 0 0
Available-for-sale securities, twelve months or longer, aggregate losses 0 0
Available-for-sale securities, aggregate losses 0 0
Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, less than twelve months, fair value 7 7
Available-for-sale securities, twelve months or longer, fair value 0  
Available-for-sale securities, fair value 7 7
Available-for-sale securities, less than twelve months, aggregate losses 0 0
Available-for-sale securities, twelve months or longer, aggregate losses 0  
Available-for-sale securities, aggregate losses $ 0 $ 0