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Investments - Equity Method Investments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]      
Equity method investments $ 4,552 $ 4,328  
Commitments to fund limited partnership and alternative investments $ 2,100    
Aggregate investment income from limited partnerships and other alternative investments 10.00% 10.00% 10.00%
Total assets $ 80,917 $ 76,780  
Total liabilities 64,470 61,453  
Total net investment income 2,568 2,305 $ 2,177
Net income (loss) 3,111 2,504 1,819
Income (Loss) from Equity Method Investments 103 181 533
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | Limited Partner [Member]      
Schedule of Investments [Line Items]      
Total assets 356,430 308,259  
Total liabilities 57,017 44,950  
Total net investment income (1,002) (1,240) 1,604
Net income (loss) $ 14,778 $ 13,000 $ 11,885