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Private Loans - Credit Ratings For Private Loans (Details) - Private loans - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]    
Total $ 2,725 $ 194
A or higher    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 1,392 0
BBB    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 259 0
BB and below    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 652 194
Unrated    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total $ 422 $ 0