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Variable Interest Entities and Equity Method Investments - Variable Interest Entities (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Variable Interest Entity [Line Items]    
Equity securities, at fair value $ 1,142 $ 1,404
Investment real estate 2,235 755
Real estate partnerships 2,757 2,856
Short-term investments, at estimated fair value 4,177 2,397
Other invested assets 2,014 120
Cash and cash equivalents 11,330 3,192
Other assets 2,745 541
Total assets 121,221 35,885
Notes payable 189 174
Total liabilities 111,193 29,986
Mortgage loans on real estate, net of allowance    
Variable Interest Entity [Line Items]    
Private loans 12,117 5,658
Private loans    
Variable Interest Entity [Line Items]    
Private loans 5,732 194
Consolidated Variable Interest Entities    
Variable Interest Entity [Line Items]    
Available-for-sale fixed maturity securities 107 63
Equity securities, at fair value 93 15
Investment real estate 2,046 172
Real estate partnerships 1,398 0
Investment funds 2,331 4
Short-term investments, at estimated fair value 75 4
Other invested assets 337 0
Cash and cash equivalents 223 26
Other assets 327 61
Total assets 8,516 533
Notes payable 189 174
Other liabilities 587 14
Total liabilities 776 188
Consolidated Variable Interest Entities | Mortgage loans on real estate, net of allowance    
Variable Interest Entity [Line Items]    
Private loans 206 0
Consolidated Variable Interest Entities | Private loans    
Variable Interest Entity [Line Items]    
Private loans 1,373 188
Unconsolidated Variable Interest Entities    
Variable Interest Entity [Line Items]    
Available-for-sale fixed maturity securities 2,146 0
Equity securities, at fair value 291 0
Investment real estate 0 0
Real estate partnerships 2,689 301
Investment funds 0 0
Short-term investments, at estimated fair value 99 0
Cash and cash equivalents 7 0
Other assets 2,084 0
Total assets 9,192 933
Maximum Exposure to Loss 10,115 933
Unconsolidated Variable Interest Entities | Available-for-sale fixed maturity securities    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 3,007 0
Unconsolidated Variable Interest Entities | Equity securities    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 291 0
Unconsolidated Variable Interest Entities | Investment 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 2,720 301
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 99 0
Unconsolidated Variable Interest Entities | Other    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 2,100 0
Unconsolidated Variable Interest Entities | Cash and cash equivalents    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 7 0
Unconsolidated Variable Interest Entities | Mortgage loans on real estate, net of allowance    
Variable Interest Entity [Line Items]    
Private loans 716 632
Unconsolidated Variable Interest Entities | Mortgage loans on real estate, net of allowance | Mortgage loans on real estate, net of allowance    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 731 632
Unconsolidated Variable Interest Entities | Private loans    
Variable Interest Entity [Line Items]    
Private loans 1,160 0
Unconsolidated Variable Interest Entities | Private loans | Private loans    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss $ 1,160 $ 0