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Investment Securities (Details 3)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Estimated Fair Value  
Estimated Fair Value, Due within 1 year $ 622
Estimated Fair Value, Due after 1 year but within 5 years 314
Estimated Fair Value, Due after 5 years but within 10 years 399
Estimated Fair Value, Due after 10 years 1,773
Total 3,108
Available For Sale Securities Debt Maturities Amortized Cost [Abstract]  
Due within 1 year 621
Due after 1 year but within 5 years 317
Due after 5 years but within 10 years 394
Due after 10 years 1,761
Total $ 3,093
Weighted average yields  
Weighted average yields, due within 1 year 2.90%
Weighted averge yields, due after 1 years but within 5 years 2.04%
Weighted averge yields, due after 5 years but within 10 years 5.25%
Weighted average yield, due after 10 years 4.71%
Weighted average yields, Total 4.16%
State and municipal obligations [Member]  
Estimated Fair Value  
Estimated Fair Value, Due within 1 year $ 17
Estimated Fair Value, Due after 1 year but within 5 years 92
Estimated Fair Value, Due after 5 years but within 10 years 274
Estimated Fair Value, Due after 10 years 1,653
Total 2,036
U.S. Government treasury obligations [Member]  
Estimated Fair Value  
Estimated Fair Value, Due within 1 year 0
Estimated Fair Value, Due after 1 year but within 5 years 0
Estimated Fair Value, Due after 5 years but within 10 years 0
Estimated Fair Value, Due after 10 years 12
Total 12
U.S. Government agency obligations [Member]  
Estimated Fair Value  
Estimated Fair Value, Due within 1 year 115
Estimated Fair Value, Due after 1 year but within 5 years 210
Estimated Fair Value, Due after 5 years but within 10 years 125
Estimated Fair Value, Due after 10 years 10
Total 460
Corporate debt securities [Member]  
Estimated Fair Value  
Estimated Fair Value, Due within 1 year 19
Estimated Fair Value, Due after 1 year but within 5 years 0
Estimated Fair Value, Due after 5 years but within 10 years 0
Estimated Fair Value, Due after 10 years 0
Total 19
Mortgage-backed securities [Member]  
Estimated Fair Value  
Estimated Fair Value, Due within 1 year 0
Estimated Fair Value, Due after 1 year but within 5 years 0
Estimated Fair Value, Due after 5 years but within 10 years 0
Estimated Fair Value, Due after 10 years 95
Total 95
Foreign government bonds and obligations [Member]  
Estimated Fair Value  
Estimated Fair Value, Due within 1 year 471
Estimated Fair Value, Due after 1 year but within 5 years 12
Estimated Fair Value, Due after 5 years but within 10 years 0
Estimated Fair Value, Due after 10 years 3
Total $ 486