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Investment Securities (Details 2)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
securities
Dec. 31, 2015
USD ($)
securities
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions [Abstract]    
Number of securities, less than 12 months | securities 37 52
Number of securities, 12 months or more | securities 6 17
Number of securities, total | securities 43 69
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Estimated Fair Value, Less than 12 months $ 451 $ 450
Estimated Fair Value, 12 months or more 32 46
Estimated Fair Value, Total 483 496
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Gross Unrealized Losses, Less than 12 months (19) (5)
Gross Unrealized Losses, 12 months or more (2) (4)
Gross Unrealized Losses, Total $ (21) $ (9)
Ratio Of Fair Value To Amortized Cost Between Ninety And One Hundred Percent [Member]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions [Abstract]    
Number of securities, less than 12 months | securities 33 52
Number of securities, 12 months or more | securities 6 15
Number of securities, total | securities 39 67
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Estimated Fair Value, Less than 12 months $ 411 $ 450
Estimated Fair Value, 12 months or more 32 37
Estimated Fair Value, Total 443 487
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Gross Unrealized Losses, Less than 12 months (13) (5)
Gross Unrealized Losses, 12 months or more (2) (2)
Gross Unrealized Losses, Total $ (15) $ (7)
Ratio Of Fair Value To Amortized Cost Less Than Ninety Percent [Member]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions [Abstract]    
Number of securities, less than 12 months | securities 4 0
Number of securities, 12 months or more | securities 0 2
Number of securities, total | securities 4 2
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Estimated Fair Value, Less than 12 months $ 40 $ 0
Estimated Fair Value, 12 months or more 0 9
Estimated Fair Value, Total 40 9
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Gross Unrealized Losses, Less than 12 months (6) 0
Gross Unrealized Losses, 12 months or more 0 (2)
Gross Unrealized Losses, Total $ (6) $ (2)