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Variable Interest Entities and Equity Method Investments - Variable Interest Entities (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Variable Interest Entity [Line Items]    
Equity securities, at fair value $ 1,522 $ 1,404
Real estate 2,008 755
Real estate partnerships 4,466 2,856
Short-term investments 3,674 2,397
Other invested assets 1,142 120
Cash and cash equivalents 13,873 3,192
Other invested assets 1,885 541
Total assets 123,659 35,885
Notes payable 179 174
Total liabilities 113,677 29,986
Mortgage loans on real estate, at amortized cost    
Variable Interest Entity [Line Items]    
Private loans 11,866 5,658
Private loans    
Variable Interest Entity [Line Items]    
Private loans 2,725 194
Consolidated Variable Interest Entities    
Variable Interest Entity [Line Items]    
Fixed maturity securities, available-for-sale 61 63
Equity securities, at fair value 568 15
Real estate 3,498 172
Real estate partnerships 1,493 0
Investment funds 2,019 4
Short-term investments 0 4
Other invested assets 399 0
Cash and cash equivalents 188 26
Other invested assets 56 61
Total assets 8,971 533
Notes payable 178 174
Other liabilities 218 14
Total liabilities 396 188
Consolidated Variable Interest Entities | Mortgage loans on real estate, at amortized cost    
Variable Interest Entity [Line Items]    
Private loans 4 0
Consolidated Variable Interest Entities | Private loans    
Variable Interest Entity [Line Items]    
Private loans 685 188
Unconsolidated Variable Interest Entities    
Variable Interest Entity [Line Items]    
Fixed maturity securities, available-for-sale 2,121 0
Equity securities, at fair value 0 0
Real estate 0 0
Real estate partnerships 520 301
Investment funds 0 0
Short-term investments 82 0
Other invested assets 156 0
Total assets 3,549 933
Maximum Exposure to Loss 3,625 933
Unconsolidated Variable Interest Entities | Fixed maturity securities, available-for-sale, at fair value    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 2,121 0
Unconsolidated Variable Interest Entities | Equity securities, at fair value    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 0 0
Unconsolidated Variable Interest Entities | Real estate    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 0 0
Unconsolidated Variable Interest Entities | Real estate partnerships    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 523 301
Unconsolidated Variable Interest Entities | Investment funds    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 0 0
Unconsolidated Variable Interest Entities | Short-term investments    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 82 0
Unconsolidated Variable Interest Entities | Other invested assets    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 156 0
Unconsolidated Variable Interest Entities | Mortgage loans on real estate, at amortized cost    
Variable Interest Entity [Line Items]    
Private loans 669 632
Unconsolidated Variable Interest Entities | Mortgage loans on real estate, at amortized cost | Mortgage loans on real estate, at amortized cost    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 742 632
Unconsolidated Variable Interest Entities | Private loans    
Variable Interest Entity [Line Items]    
Private loans 0 0
Unconsolidated Variable Interest Entities | Private loans | Private loans, at amortized cost    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss $ 0 $ 0