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Investment Securities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2020
Schedule of Held-to-maturity Securities [Line Items]        
Amount of collateralized loan obligations transferred from AFS to HTM for capital management purposes $ 104,500      
Approximate percentage rated at least AA+   98.00% 98.00%  
Allowance for credit losses on investment securities   $ 42 $ 78  
Cumulative effect of change in accounting principles        
Schedule of Held-to-maturity Securities [Line Items]        
Allowance for credit losses on investment securities       $ 10
Unrealized gains/(losses) on investment securities        
Schedule of Held-to-maturity Securities [Line Items]        
Pretax unrealized gains included in AOCI on the securities at the date of transfer $ 425