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Loans and Allowance for Credit Losses - Narrative (Details)
3 Months Ended
Mar. 31, 2023
USD ($)
loanSegment
loan
deposit
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
loan
Financing Receivable, Credit Quality Indicator [Line Items]      
Number of loans and leases segments | loanSegment 2    
Loans pledged as collateral $ 33,801,000,000   $ 32,053,000,000
Number of loans on non-accrual status | loan 1   0
Nonaccrual loan value $ 45,000,000    
Financing receivable, held-for-sale 12,000,000   $ 5,000,000
Charge-offs 3,000,000    
Allowance for credit losses on loans $ 115,000,000   97,000,000
Investment grade loans 86.00%    
Speculative grade loans 12.00%    
Speculative senior secured loans with BB or B rating 95.00%    
Provision for credit losses $ 44,000,000 $ 0  
Episodic provision $ 29,000,000    
Interest-Bearing Deposits      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans no longer meeting similar risk of collective pool | deposit 1    
Loans no longer meeting similar risk of collective pool, amount $ 1,000,000,000    
Allowance for credit losses on loans 29,000,000    
Asset pledged as collateral      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans pledged as collateral 9,710,000,000   $ 10,170,000,000
Leveraged Loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing receivable for sale $ 283,000,000    
Commercial and Financial      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans no longer meeting similar risk of collective pool | loan 7    
Loans no longer meeting similar risk of collective pool, amount $ 174,000,000    
Allowance for credit losses on loans $ 23,000,000