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Securities (Amortized Cost and Fair Value of Available-for-Sale and Held-to-Maturity Securities) (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Debt securities:    
Less than 1 year [1] $ 148  
1-5 years [1] 8,034  
5-10 years [1] 19,631  
Over 10 years [1] 2,603  
Equity securities 698  
Available-for-sale and other securities, Amortized Cost 31,114 $ 31,024
Debt securities:    
Less than 1 year [1] 149  
1-5 years [1] 8,117  
5-10 years [1] 19,887  
Over 10 years [1] 2,627  
Equity securities 700  
Available-for-sale and other securities, fair value [2] 31,480 31,183
Debt securities:    
Less than 1 year [1] 7  
1-5 years [1] 8  
5-10 years [1] 8  
Over 10 years [1] 2  
Equity securities 0  
Held-to-maturity securities, amortized cost [3] 25 26
Debt securities:    
Under 1 year [1] 7  
1-5 years [1] 8  
5-10 years [1] 8  
Over 10 years [1] 2  
Equity securities 0  
Held-to-maturity securities, fair value $ 25 $ 26
[1]

(a) Actual maturities may differ from contractual maturities when a right to call or prepay obligations exists with or without call or prepayment penalties .

[2]

Amortized cost of $ 31,114 and $ 31,024 at September 30, 2017 and December 31, 2016 , respectively.

[3]

Fair value of $ 25 and $ 26 at September 30, 2017 and December 31, 2016 , respectively.