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Investment Securities (Details 3)
$ in Millions
Sep. 30, 2015
USD ($)
Available For Sale Securities Debt Maturities Amortized Cost [Abstract]  
Due within 1 year $ 459
Due after 1 year but within 5 years 324
Due after 5 years but within 10 years 259
Due after 10 years 2,746
Total 3,788
Estimated Fair Value  
Estimated Fair Value, Due within 1 year 459
Estimated Fair Value, Due after 1 year but within 5 years 331
Estimated Fair Value, Due after 5 years but within 10 years 275
Estimated Fair Value, Due after 10 years 2,832
Total $ 3,897