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Investment Securities - Investment Securities Available-for-Sale (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost $ 68,980 $ 67,381
Available-for-sale securities, Unrealized Gains 558 174
Available-for-sale securities, Unrealized Losses Other (341) (1,440)
Available-for-sale securities, Fair Value [1] 69,197 66,115
U.S. Treasury and Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 17,174 19,604
Available-for-sale securities, Unrealized Gains 54 11
Available-for-sale securities, Unrealized Losses Other (57) (358)
Available-for-sale securities, Fair Value 17,171 19,257
Residential Mortgage-Backed Securities [Member] | Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 45,149 40,542
Available-for-sale securities, Unrealized Gains 266 120
Available-for-sale securities, Unrealized Losses Other (281) (910)
Available-for-sale securities, Fair Value 45,134 39,752
Commercial [Member] | Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 1 2
Available-for-sale securities, Fair Value 1 2
Asset-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 383  
Available-for-sale securities, Fair Value 388  
Asset-Backed Securities [Member] | Other Asset-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 383 397
Available-for-sale securities, Unrealized Gains 5 6
Available-for-sale securities, Fair Value 388 403
Obligations of State and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 6,273 6,836
Available-for-sale securities, Unrealized Gains 233 37
Available-for-sale securities, Unrealized Losses Other (3) (172)
Available-for-sale securities, Fair Value $ 6,503 $ 6,701
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.