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Investments (Investment Income Net of Related Expenses) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue $ 965 $ 800 $ 2,756 $ 2,423
Investment expense (43) (31) (121) (90)
Investment income, net of related expenses 922 769 2,635 2,333
Available-for-sale Securities [Member]        
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue 707 591 2,035 1,683
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 84 74 238 223
Policy loans        
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue 13 13 39 40
Funds withheld at interest        
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue 88 67 240 175
Short-term Investments [Member]        
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue 28 7 71 11
Partnership Interest        
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue 41 43 114 281
Other invested assets        
Major Categories Of Investment Income Net of Expenses [Line Items]        
Investment revenue $ 2 $ 3 $ 14 $ 5