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Investment Securities (Details 1) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Available-for-sale investment securities with gross unrealized losses and length of time    
Estimated Fair Value, Less than 12 months $ 90 $ 0
Estimated Fair Value, 12 months or more 46 105
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Gross Unrealized Losses, Less than 12 months 3 0
Gross Unrealized Losses, 12 months or more 3 3
U.S. States and Political Subdivisions Debt Securities [Member]    
Available-for-sale investment securities with gross unrealized losses and length of time    
Estimated Fair Value, Less than 12 months 59 0
Estimated Fair Value, 12 months or more 13 72
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Gross Unrealized Losses, Less than 12 months 2 0
Gross Unrealized Losses, 12 months or more 2 2
Foreign government bonds and obligations [Member]    
Available-for-sale investment securities with gross unrealized losses and length of time    
Estimated Fair Value, Less than 12 months 31 0
Estimated Fair Value, 12 months or more 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Gross Unrealized Losses, Less than 12 months 1 0
Gross Unrealized Losses, 12 months or more 0 0
Other [Member]    
Available-for-sale investment securities with gross unrealized losses and length of time    
Estimated Fair Value, Less than 12 months 0 0
Estimated Fair Value, 12 months or more 33 33
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 $ 1 $ 1