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Investment Securities - Investment Securities Available-for-Sale (Detail) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost $ 67,739 $ 66,985
Available-for-sale securities, Unrealized Gains 341 334
Available-for-sale securities, Unrealized Losses Other-than-Temporary   (6)
Available-for-sale securities, Unrealized Losses Other (625) (1,029)
Available-for-sale securities, Fair Value [1] 67,455 66,284
U.S. Treasury and Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 20,633 17,314
Available-for-sale securities, Unrealized Gains 28 11
Available-for-sale securities, Unrealized Losses Other (122) (198)
Available-for-sale securities, Fair Value 20,539 17,127
Mortgage-Backed Securities Residential [Member] | Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 41,173 43,558
Available-for-sale securities, Unrealized Gains 211 225
Available-for-sale securities, Unrealized Losses Other (418) (645)
Available-for-sale securities, Fair Value 40,966 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, 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, Fair Value   195
Commercial [Member] | Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 10 15
Available-for-sale securities, Fair Value 10 15
Asset-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 430  
Available-for-sale securities, Fair Value 437  
Asset-Backed Securities [Member] | Asset-Backed Securities Other [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 430 475
Available-for-sale securities, Unrealized Gains 7 8
Available-for-sale securities, Fair Value 437 483
Obligations of State and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 5,469 5,167
Available-for-sale securities, Unrealized Gains 85 55
Available-for-sale securities, Unrealized Losses Other (85) (183)
Available-for-sale securities, Fair Value 5,469 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, Fair Value   9
Other Investment [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 24 27
Available-for-sale securities, Unrealized Gains 10 9
Available-for-sale securities, Fair Value $ 34 $ 36
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.