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Investment Securities - Investment Securities Available-for-Sale (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost $ 67,634 $ 66,985
Available-for-sale securities, Unrealized Gains 300 334
Available-for-sale securities, Unrealized Losses Other-than-Temporary   (6)
Available-for-sale securities, Unrealized Losses Other (903) (1,029)
Available-for-sale securities, total, fair value [1] 67,031 66,284
U.S. Treasury and Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 19,309 17,314
Available-for-sale securities, Unrealized Gains 13 11
Available-for-sale securities, Unrealized Losses Other (169) (198)
Available-for-sale securities, total, fair value 19,153 17,127
Mortgage-Backed Securities Residential [Member] | Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 42,492 43,558
Available-for-sale securities, Unrealized Gains 216 225
Available-for-sale securities, Unrealized Losses Other (582) (645)
Available-for-sale securities, total, fair value 42,126 43,138
Mortgage-Backed Securities Residential [Member] | Non-Agency Prime [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost   240
Available-for-sale securities, Unrealized Gains   6
Available-for-sale securities, Unrealized Losses Other-than-Temporary   (3)
Available-for-sale securities, Unrealized Losses Other   (1)
Available-for-sale securities, total, fair value   242
Mortgage-Backed Securities Residential [Member] | Non-Agency Non-Prime [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost   178
Available-for-sale securities, Unrealized Gains   20
Available-for-sale securities, Unrealized Losses Other-than-Temporary   (3)
Available-for-sale securities, total, fair value   195
Commercial [Member] | Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 14 15
Available-for-sale securities, total, fair value 14 15
Asset-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 436  
Available-for-sale securities, total, fair value 443  
Asset-Backed Securities [Member] | Asset-Backed Securities Other [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 436 475
Available-for-sale securities, Unrealized Gains 7 8
Available-for-sale securities, total, fair value 443 483
Obligations of State and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 5,353 5,167
Available-for-sale securities, Unrealized Gains 55 55
Available-for-sale securities, Unrealized Losses Other (152) (183)
Available-for-sale securities, total, fair value 5,256 5,039
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost   11
Available-for-sale securities, Unrealized Losses Other   (2)
Available-for-sale securities, total, fair value   9
Other Investment [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 30 27
Available-for-sale securities, Unrealized Gains 9 9
Available-for-sale securities, total, fair value $ 39 $ 36
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.