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Investment Securities (Details 1) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Available-for-sale investment securities with gross unrealized losses and length of time    
Estimated Fair Value, Less than 12 months $ 451 $ 452
Estimated Fair Value, 12 months or more 32 46
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)
State and municipal obligations [Member]    
Available-for-sale investment securities with gross unrealized losses and length of time    
Estimated Fair Value, Less than 12 months 153 100
Estimated Fair Value, 12 months or more 0 13
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Gross Unrealized Losses, Less than 12 months (11) (3)
Gross Unrealized Losses, 12 months or more 0 (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 0 99
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 0 (1)
Gross Unrealized Losses, 12 months or more 0 0
U.S. Government treasury obligations [Member]    
Available-for-sale investment securities with gross unrealized losses and length of time    
Estimated Fair Value, Less than 12 months 298 253
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 (8) (1)
Gross Unrealized Losses, 12 months or more 0 0
Mortgage-backed securities [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 0 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 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 32 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 $ (2) $ (2)