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Private Loans - Credit Ratings For Private Loans (Details) - Private Loan - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, excluding accrued interest, after allowance for credit loss $ 1,724 $ 194
AAA    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, excluding accrued interest, after allowance for credit loss 0 0
AA    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, excluding accrued interest, after allowance for credit loss 72 0
A    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, excluding accrued interest, after allowance for credit loss 926 0
BBB    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, excluding accrued interest, after allowance for credit loss 35 0
BB and below    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, excluding accrued interest, after allowance for credit loss 604 194
Unrated    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, excluding accrued interest, after allowance for credit loss $ 87 $ 0