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Investment Securities - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended
Apr. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Schedule of Held-to-maturity Securities [Line Items]        
Approximate percentage rated at least AA+   98.00% 98.00%  
Investment securities, allowance for credit losses   $ 41 $ 42 $ 94
Subsequent Event        
Schedule of Held-to-maturity Securities [Line Items]        
Amount of investment securities transferred from AFS to HTM for capital management purposes $ 65,900      
Unrealized gains/(losses) on investment securities | Subsequent Event        
Schedule of Held-to-maturity Securities [Line Items]        
Pretax unrealized losses included in AOCI on the securities at the date of transfer $ 4,700