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Accumulated Other Comprehensive Loss - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Tax (benefit) expense included in net unrealized gains (losses), investment securities $ 55 $ (63)    
Tax included in reclassification, investment securities (2) (1)    
Tax included in amortization, investment securities 1 1    
Tax (benefit) expense included in net unrealized gains (losses), fair value option liabilities (35) 5    
Tax (benefit) expense included in net unrealized gains (losses), cash flow hedges 2      
Tax (benefit) expense included in net unrealized gains (losses), cash flow hedges (less than $1 million)   0    
Tax included in reclassification, cash flow hedges 2      
Tax included in reclassification, cash flow hedges   1    
Tax included in net unrealized gains (losses), pension and postretirement benefit liability $ (1) $ 0    
Unrealized Gains (Losses) on Investment Securities [Member] | Accounting Standards Update 2016-01, Equity Investments Previously Classified as Available-for-sale [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cumulative effect of new accounting principle in period of adoption, tax     $ 0 $ 2