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Investment Securities - Investment Securities Available-for-Sale (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost $ 68,599 $ 67,381
Available-for-sale securities, Unrealized Gains 314 174
Available-for-sale securities, Unrealized Losses Other-than-Temporary 0 0
Available-for-sale securities, Unrealized Losses Other (800) (1,440)
Available-for-sale securities, Fair Value [1] 68,113 66,115
U.S. Treasury and Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 19,127 19,604
Available-for-sale securities, Unrealized Gains 17 11
Available-for-sale securities, Unrealized Losses Other-than-Temporary 0 0
Available-for-sale securities, Unrealized Losses Other (225) (358)
Available-for-sale securities, Fair Value 18,919 19,257
Residential Mortgage-Backed Securities [Member] | Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 42,267 40,542
Available-for-sale securities, Unrealized Gains 153 120
Available-for-sale securities, Unrealized Losses Other-than-Temporary 0 0
Available-for-sale securities, Unrealized Losses Other (541) (910)
Available-for-sale securities, Fair Value 41,879 39,752
Commercial [Member] | Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 2 2
Available-for-sale securities, Unrealized Losses Other-than-Temporary 0 0
Available-for-sale securities, Fair Value 2 2
Asset-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 389  
Available-for-sale securities, Fair Value 395  
Asset-Backed Securities [Member] | Other Asset-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 389 397
Available-for-sale securities, Unrealized Gains 6 6
Available-for-sale securities, Unrealized Losses Other-than-Temporary 0 0
Available-for-sale securities, Fair Value 395 403
Obligations of State and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 6,814 6,836
Available-for-sale securities, Unrealized Gains 138 37
Available-for-sale securities, Unrealized Losses Other-than-Temporary 0 0
Available-for-sale securities, Unrealized Losses Other (34) (172)
Available-for-sale securities, Fair Value $ 6,918 $ 6,701
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.