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Investment Securities (Maturities of Securities, Held to Maturity) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]    
Held to maturity securities: Within 1 year $ 99  
Held to maturity securities: After 1 year through 5 years 5,666  
Held to maturity securities: After 5 years through 10 years 24,334  
Held to maturity securities: After 10 years 44,345  
Held to maturity securities: Fair Value 74,444 $ 50,088
Held to maturity securities: Within 1 year amortized cost 99  
Held to maturity securities: After 1 year through 5 years amortized cost 5,559  
Held to maturity securities: After 5 years through 10 years amortized cost 24,500  
Held to maturity securities: After 10 years amortized cost 45,045  
Held to maturity securities: Amortized Cost 75,203 50,007 [1]
U.S. agency mortgage-backed securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Held to maturity securities: Within 1 year  
Held to maturity securities: After 1 year through 5 years 5,080  
Held to maturity securities: After 5 years through 10 years 22,954  
Held to maturity securities: After 10 years 43,643  
Held to maturity securities: Fair Value 71,677 48,883
Held to maturity securities: Amortized Cost 72,439 48,785
Non-agency commercial mortgage-backed securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Held to maturity securities: Within 1 year  
Held to maturity securities: After 1 year through 5 years  
Held to maturity securities: After 5 years through 10 years 364  
Held to maturity securities: After 10 years 640  
Held to maturity securities: Fair Value 1,004 985
Held to maturity securities: Amortized Cost 997 999
Asset-backed securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Held to maturity securities: Within 1 year  
Held to maturity securities: After 1 year through 5 years 150  
Held to maturity securities: After 5 years through 10 years 791  
Held to maturity securities: After 10 years  
Held to maturity securities: Fair Value 941  
Held to maturity securities: Amortized Cost 941  
Corporate debt securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Held to maturity securities: Within 1 year  
Held to maturity securities: After 1 year through 5 years 436  
Held to maturity securities: After 5 years through 10 years  
Held to maturity securities: After 10 years  
Held to maturity securities: Fair Value 436  
Held to maturity securities: Amortized Cost 436  
U.S. Treasury securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Held to maturity securities: Within 1 year  
Held to maturity securities: After 1 year through 5 years  
Held to maturity securities: After 5 years through 10 years 219  
Held to maturity securities: After 10 years  
Held to maturity securities: Fair Value 219 220
Held to maturity securities: Amortized Cost 223 $ 223
Commercial paper [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Held to maturity securities: Within 1 year 99  
Held to maturity securities: After 1 year through 5 years  
Held to maturity securities: After 5 years through 10 years  
Held to maturity securities: After 10 years  
Held to maturity securities: Fair Value 99  
Held to maturity securities: Amortized Cost 99  
U.S. state and municipal securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Held to maturity securities: Within 1 year  
Held to maturity securities: After 1 year through 5 years  
Held to maturity securities: After 5 years through 10 years 6  
Held to maturity securities: After 10 years 62  
Held to maturity securities: Fair Value 68  
Held to maturity securities: Amortized Cost $ 68  
[1] Adjusted for the retrospective adoption of ASU 2015-03. See New Accounting Standards in Note 2 for additional information.