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Allowance for Credit Losses - Gross Charge-Offs by Year of Origination (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Allowance for Loan and Lease Losses [Roll Forward]        
Year one, current fiscal year charge offs     $ 7  
Year two, current fiscal year charge offs     5  
Year three, current fiscal year charge offs     6  
Year four, current fiscal year charge offs     4  
Year five, current fiscal year charge offs     8  
Prior year charge offs     20  
Revolving loans charge offs     4  
Total charge offs $ 33 $ 21 54 $ 40
Commercial: | Commercial, financial and industrial        
Allowance for Loan and Lease Losses [Roll Forward]        
Year one, current fiscal year charge offs     1  
Year two, current fiscal year charge offs     5  
Year three, current fiscal year charge offs     6  
Year four, current fiscal year charge offs     4  
Year five, current fiscal year charge offs     6  
Prior year charge offs     10  
Revolving loans charge offs     1  
Total charge offs 19 12 33 25
Commercial: | Commercial Real Estate        
Allowance for Loan and Lease Losses [Roll Forward]        
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     8  
Revolving loans charge offs     0  
Total charge offs 8 0 10 0
Consumer: | Consumer Real Estate        
Allowance for Loan and Lease Losses [Roll Forward]        
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     0  
Prior year charge offs     1  
Revolving loans charge offs     0  
Total charge offs 1 2 1 3
Consumer: | Credit Card and Other        
Allowance for Loan and Lease Losses [Roll Forward]        
Year one, current fiscal year charge offs     6  
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     0  
Prior year charge offs     1  
Revolving loans charge offs     3  
Total charge offs $ 5 $ 7 $ 10 $ 12