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Investments (Investment Income Net of Related Expenses) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue $ 1,228 $ 965 $ 3,359 $ 2,756
Investment expense (40) (43) (128) (121)
Investment income, net of related expenses 1,188 922 3,231 2,635
Available-for-sale Securities [Member]        
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue 933 707 2,574 2,035
Equity securities        
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue 2 2 5 5
Mortgage Loans on Real Estate [Member]        
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue 103 84 290 238
Policy loans        
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue 14 13 42 39
Funds withheld at interest        
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue 88 88 253 240
Short-term Investments [Member]        
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue 48 28 126 71
Partnership Interest        
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue 46 41 74 114
Other invested assets        
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue $ (6) $ 2 $ (5) $ 14