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Investment Securities (Maturities of Securities, Available for Sale) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities: Within 1 year $ 4,443  
Available for sale securities: After 1 year through 5 years 29,757  
Available for sale securities: After 5 years through 10 years 21,435  
Available for sale securities: After 10 years 21,730  
Available for sale securities: Fair Value 77,365 $ 65,646 [1]
Available for sale securities: Within 1 year amortized cost 4,440  
Available for sale securities: After 1 year through 5 years amortized cost 29,741  
Available for sale securities: After 5 years through 10 years amortized cost 21,519  
Available for sale securities: After 10 years amortized cost 21,927  
Available for sale securities: Amortized Cost 77,627 65,860
U.S. agency mortgage-backed securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities: Within 1 year 47  
Available for sale securities: After 1 year through 5 years 3,475  
Available for sale securities: After 5 years through 10 years 16,847  
Available for sale securities: After 10 years 12,826  
Available for sale securities: Fair Value 33,195 22,149
Available for sale securities: Amortized Cost 33,167 22,014
Asset-backed securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities: Within 1 year  
Available for sale securities: After 1 year through 5 years 8,728  
Available for sale securities: After 5 years through 10 years 3,799  
Available for sale securities: After 10 years 7,808  
Available for sale securities: Fair Value 20,335 21,485
Available for sale securities: Amortized Cost 20,520 21,784
Corporate debt securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities: Within 1 year 2,332  
Available for sale securities: After 1 year through 5 years 7,520  
Available for sale securities: After 5 years through 10 years  
Available for sale securities: After 10 years  
Available for sale securities: Fair Value 9,852 10,747
Available for sale securities: Amortized Cost 9,850 10,764
U.S. Treasury securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities: Within 1 year 1,199  
Available for sale securities: After 1 year through 5 years 6,707  
Available for sale securities: After 5 years through 10 years 717  
Available for sale securities: After 10 years  
Available for sale securities: Fair Value 8,623 5,704
Available for sale securities: Amortized Cost 8,679 5,719
U.S. agency notes [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities: Within 1 year  
Available for sale securities: After 1 year through 5 years 1,907  
Available for sale securities: After 5 years through 10 years  
Available for sale securities: After 10 years  
Available for sale securities: Fair Value 1,907 3,150
Available for sale securities: Amortized Cost 1,915 3,177
Certificates of deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities: Within 1 year 651  
Available for sale securities: After 1 year through 5 years 1,420  
Available for sale securities: After 5 years through 10 years  
Available for sale securities: After 10 years  
Available for sale securities: Fair Value 2,071 1,683
Available for sale securities: Amortized Cost 2,070 1,685
U.S. state and municipal securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities: Within 1 year  
Available for sale securities: After 1 year through 5 years  
Available for sale securities: After 5 years through 10 years 72  
Available for sale securities: After 10 years 1,051  
Available for sale securities: Fair Value 1,123 424
Available for sale securities: Amortized Cost 1,167 414
Commercial paper [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities: Within 1 year 214  
Available for sale securities: After 1 year through 5 years  
Available for sale securities: After 5 years through 10 years  
Available for sale securities: After 10 years  
Available for sale securities: Fair Value 214  
Available for sale securities: Amortized Cost 214  
Non-agency commercial mortgage-backed securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities: Within 1 year  
Available for sale securities: After 1 year through 5 years  
Available for sale securities: After 5 years through 10 years  
Available for sale securities: After 10 years 45  
Available for sale securities: Fair Value 45 299
Available for sale securities: Amortized Cost $ 45 $ 298
[1] Adjusted for the retrospective adoption of ASU 2015-03. See New Accounting Standards in Note 2 for additional information.