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Borrowings (Additional Information) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Federal Home Loan Bank      
Subordinated Borrowing [Line Items]      
Subordinated Borrowing, Interest Rate 4.70% 5.00%  
Subordinated Debt $ 695 $ 695  
Other Short-Term Borrowings 800 800 $ 1,400
Secured and unused capacity 4,100 4,100  
Bank Term Funding Program      
Subordinated Borrowing [Line Items]      
Secured Unused Borrowing Capacity 1,300 1,300  
Unsecured Lines of Credit   300  
Bank Term Funding Program | Minimum [Member]      
Subordinated Borrowing [Line Items]      
Unpledged AFS securities $ 550 $ 550