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Investment Securities (Details 2)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
securities
Dec. 31, 2016
USD ($)
securities
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract]    
Number of securities, less than 12 months | securities 22 37
Number of securities, 12 months or more | securities 6 6
Number of securities, total | securities 28 43
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Estimated Fair Value, Less than 12 months $ 467 $ 451
Estimated Fair Value, 12 months or more 32 32
Estimated Fair Value, Total 499 483
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Gross Unrealized Losses, Less than 12 months (7) (19)
Gross Unrealized Losses, 12 months or more (2) (2)
Gross Unrealized Losses, Total $ (9) $ (21)
Ratio Of Fair Value To Amortized Cost Between Ninety And One Hundred Percent [Member]    
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract]    
Number of securities, less than 12 months | securities 22 33
Number of securities, 12 months or more | securities 6 6
Number of securities, total | securities 28 39
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Estimated Fair Value, Less than 12 months $ 467 $ 411
Estimated Fair Value, 12 months or more 32 32
Estimated Fair Value, Total 499 443
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Gross Unrealized Losses, Less than 12 months (7) (13)
Gross Unrealized Losses, 12 months or more (2) (2)
Gross Unrealized Losses, Total $ (9) $ (15)
Ratio Of Fair Value To Amortized Cost Less Than Ninety Percent [Member]    
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract]    
Number of securities, less than 12 months | securities 0 4
Number of securities, 12 months or more | securities 0 0
Number of securities, total | securities 0 4
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Estimated Fair Value, Less than 12 months $ 0 $ 40
Estimated Fair Value, 12 months or more 0 0
Estimated Fair Value, Total 0 40
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Gross Unrealized Losses, Less than 12 months 0 (6)
Gross Unrealized Losses, 12 months or more 0 0
Gross Unrealized Losses, Total $ 0 $ (6)