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Loans and Allowance for Credit Losses - Narrative (Details)
$ in Millions
3 Months Ended
Mar. 31, 2025
USD ($)
loan
loanSegment
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
loan
Financing Receivable, Credit Quality Indicator [Line Items]      
Number of loans and leases segments | loanSegment 2    
Loans pledged as collateral $ 44,509   $ 43,026
Number of loans on non-accrual status | loan 3   2
Nonaccrual loan value $ 227   $ 191
Purchase of collateralized loan obligations 1,760    
Charge-offs 9    
Allowance for credit losses on loans $ 176   $ 174
Investment grade loans 87.00%    
Speculative grade loans 11.00%    
Speculative senior secured loans with BB or B rating 91.00%    
Provision for credit losses $ 12 $ 27  
More than 90 days contractually past due      
Financing Receivable, Credit Quality Indicator [Line Items]      
Number of loans on non-accrual status | loan 1   1
Nonaccrual loan value $ 101   $ 101
Asset pledged as collateral      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans pledged as collateral 14,400   $ 13,900
Leveraged Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing receivable for sale 100    
Loans remained unsettled $ 20    
Commercial and Financial      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans no longer meeting similar risk of collective pool | loan 4    
Loans no longer meeting similar risk of collective pool, amount $ 49    
Allowance for credit losses on loans $ 100    
Commercial Real Estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans no longer meeting similar risk of collective pool | loan 5    
Loans no longer meeting similar risk of collective pool, amount $ 401