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Goodwill - Schedule of Carrying Amount of Goodwill (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Goodwill [Roll Forward]    
Beginning balance $ 2,752 $ 2,753
Ending balance 2,752 2,752
Commercial Bank    
Goodwill [Roll Forward]    
Ending balance 218  
Consumer Bank    
Goodwill [Roll Forward]    
Beginning balance 1,819 1,819
Ending balance 1,819 1,819
Commercial Bank    
Goodwill [Roll Forward]    
Beginning balance 933 933
Ending balance $ 933 $ 933