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Investment Securities - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 01, 2023
Dec. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]        
Amount of investment securities transferred from AFS to HTM for capital management purposes   $ 78,300    
Approximate percentage rated at least AA+   98.00% 99.00%  
Investment securities, allowance for credit losses   $ 96 $ 90 $ 41
Obligations of U.S. states and municipalities | Accounting Standards Update 2022-01        
Schedule of Held-to-maturity Securities [Line Items]        
Amount of investment securities transferred from HTM to AFS $ 7,100      
Pre-tax unrealized losses recognized within AOCI for transfer of securities from HTM to AFS $ 38      
Unrealized gains/(losses) on investment securities        
Schedule of Held-to-maturity Securities [Line Items]        
Pretax unrealized losses included in AOCI on the securities at the date of transfer   $ 4,800