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Basis of Presentation and Accounting Policies (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
May 04, 2023
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Mar. 31, 2023
Jan. 01, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Business Acquisition [Line Items]                    
Allowance for loan and lease losses   $ (737) $ (624) $ (737) $ (624) $ (715)   $ (685) $ (622) $ (670)
Retained earnings   3,830   3,830       3,430    
Accounting Standards Update 2022-02                    
Business Acquisition [Line Items]                    
Allowance for loan and lease losses             $ 6 $ 6    
Retained earnings             $ 4      
TD Transaction                    
Business Acquisition [Line Items]                    
Proceeds from merger contract termination $ 200                  
Fee reimbursement received $ 25                  
Merger and integration expense   $ 30 $ 25 $ 51 $ 34