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Loans and Allowance for Credit Losses - Narrative (Details)
3 Months Ended
Mar. 31, 2024
USD ($)
loan
loanSegment
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
loan
Financing Receivable, Credit Quality Indicator [Line Items]      
Number of loans and leases segments | loanSegment 2    
Loans pledged as collateral $ 38,500,000,000   $ 36,496,000,000
Number of loans on non-accrual status | loan 3   3
Nonaccrual loan value $ 105,000,000   $ 70,000,000
Financing receivable, held-for-sale 17,000,000    
Charge-offs 29,000,000    
Allowance for credit losses on loans $ 135,000,000   135,000,000
Investment grade loans 88.00%    
Speculative grade loans 11.00%    
Speculative senior secured loans with BB or B rating 91.00%    
Provision for credit losses $ 27,000,000 $ 44,000,000  
Asset pledged as collateral      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans pledged as collateral 13,040,000,000.00   $ 13,000,000,000
Leveraged Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing receivable for sale 102,000,000    
Financing receivable, held-for-sale $ 17,000,000    
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 $ 43,000,000    
Allowance for credit losses on loans $ 47,000,000    
Commercial Real Estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans no longer meeting similar risk of collective pool | loan 3    
Loans no longer meeting similar risk of collective pool, amount $ 224,000,000