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Accumulated Other Comprehensive Income - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Unrealized Gains (Losses) on Investment Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Tax on net unrealized gains (losses) arising during period $ (195) $ 245  
Tax on reclassification adjustment (7) (7)  
Tax on reversal of provision for credit losses realized in net income (loss) 0 1  
Tax on amortization of net unrealized losses on securities transferred from available-for-sale to held-to-maturity realized in net income (loss) 1 1  
Unrealized Gains (Losses) on Fair Value Option Liabilities Attributable to Our Own Credit Spread [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Tax on net unrealized gains (losses) arising during period (3) 128  
Unrealized Gains (Losses) on Derivatives Designated as Cash Flow Hedges [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Tax on net unrealized gains (losses) arising during period (4) 28  
Tax on reclassification adjustment $ 1 $ 1  
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Unrealized Gains (Losses) on Investment Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Tax on cumulative effect adjustment     $ 1