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Investment Securities - Schedule of Contractual Maturities for Available for Sale Securities (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Amortized Cost    
Due in 1 year or less $ 785  
Due after 1 year through 5 years 5,576  
Due after 5 years through 10 years 1,825  
Due after 10 years 30,567  
Total Amortized Cost 38,753 $ 38,859
Fair Value    
Due in 1 year or less 785  
Due after 1 year through 5 years 5,619  
Due after 5 years through 10 years 1,865  
Due after 10 years 31,162  
Available-for-sale Securities $ 39,431 $ 39,508