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Allowance for Credit Losses - Schedule Of Gross Charge Offs by Year of Origination (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Year one, current fiscal year charge offs $ 13    
Year two, current fiscal year charge offs 19    
Year three, current fiscal year charge offs 82    
Year four, current fiscal year charge offs 5    
Year five, current fiscal year charge offs 12    
Prior year charge offs 54    
Revolving loans charge offs 14    
Total charge offs 199 $ 93 $ 59
Commercial | C&I      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Year one, current fiscal year charge offs 1    
Year two, current fiscal year charge offs 17    
Year three, current fiscal year charge offs 82    
Year four, current fiscal year charge offs 5    
Year five, current fiscal year charge offs 10    
Prior year charge offs 34    
Revolving loans charge offs 7    
Total charge offs 156 62 34
Commercial | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Year one, current fiscal year charge offs 0    
Year two, current fiscal year charge offs 0    
Year three, current fiscal year charge offs 0    
Year four, current fiscal year charge offs 0    
Year five, current fiscal year charge offs 2    
Prior year charge offs 15    
Revolving loans charge offs 0    
Total charge offs 17 1 5
Consumer | Consumer real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Year one, current fiscal year charge offs 0    
Year two, current fiscal year charge offs 1    
Year three, current fiscal year charge offs 0    
Year four, current fiscal year charge offs 0    
Year five, current fiscal year charge offs 0    
Prior year charge offs 3    
Revolving loans charge offs 0    
Total charge offs 4 5 5
Consumer | Credit card and other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Year one, current fiscal year charge offs 12    
Year two, current fiscal year charge offs 1    
Year three, current fiscal year charge offs 0    
Year four, current fiscal year charge offs 0    
Year five, current fiscal year charge offs 0    
Prior year charge offs 2    
Revolving loans charge offs 7    
Total charge offs $ 22 $ 25 $ 15