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Investment Securities (Contractual Maturity Distribution Of Debt Securities) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Investment securities available-for-sale, Amortized Cost $ 12,225 $ 11,061 [1]
Investment securities available-for-sale, Fair Value 12,045 10,938 [1]
Debt securities    
Available-for-sale, Within one year, Amortized Cost 100  
Available-for-sale, After one year through five years, Amortized Cost 2,647  
Available-for-sale, After five years through ten years, Amortized Cost 1,522  
Available-for-sale, After ten years, Amortized Cost 7,956  
Available-for-sale, Within one year, Fair Value 100  
Available-for-sale, After one year through five years, Fair Value 2,642  
Available-for-sale, After five years through ten years, Fair Value 1,502  
Available-for-sale, After ten years, Fair Value 7,801  
Investment securities available-for-sale, Amortized Cost 12,225  
Investment securities available-for-sale, Fair Value $ 12,045  
Equity and other non-debt securities    
Investment securities available-for-sale, Amortized Cost   83
Investment securities available-for-sale, Fair Value   $ 82
[1] Included auction-rate securities at amortized cost and fair value of $51 million and $49 million, respectively, as of December 31, 2017.