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Investment Securities (Details 2)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
securities
Dec. 31, 2014
USD ($)
securities
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions [Abstract]    
Number of securities, less than 12 months | securities 52 0
Number of securities, 12 months or more | securities 17 15
Number of securities, total | securities 69 15
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Estimated Fair Value, Less than 12 months $ 450  
Estimated Fair Value, 12 months or more 46 $ 105
Estimated Fair Value, Total 496 105
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Gross Unrealized Losses, Less than 12 months (5) 0
Gross Unrealized Losses, 12 months or more (4) (3)
Gross Unrealized Losses, Total $ 9 $ 3
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 52 0
Number of securities, 12 months or more | securities 15 15
Number of securities, total | securities 67 15
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Estimated Fair Value, Less than 12 months $ 450  
Estimated Fair Value, 12 months or more 37 $ 105
Estimated Fair Value, Total 487 105
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Gross Unrealized Losses, Less than 12 months (5) 0
Gross Unrealized Losses, 12 months or more (2) (3)
Gross Unrealized Losses, Total $ 7 $ 3
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 0 0
Number of securities, 12 months or more | securities 2 0
Number of securities, total | securities 2 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Estimated Fair Value, Less than 12 months $ 0  
Estimated Fair Value, 12 months or more 9 $ 0
Estimated Fair Value, Total 9 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Gross Unrealized Losses, Less than 12 months 0 0
Gross Unrealized Losses, 12 months or more (2) 0
Gross Unrealized Losses, Total $ 2 $ 0