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Investments - Net Realized Capital Gains (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of Investments [Line Items]      
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Sell before Recovery $ 0 $ (3) $ 0
Total net realized capital gains (losses) (188) (627) 509
Translation Adjustment Functional to Reporting Currency, Increase (Decrease), Gross of Tax (15) 28 (1)
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Continental Europe Operations [Member]      
Schedule of Investments [Line Items]      
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal     21
Non-qualifying      
Schedule of Investments [Line Items]      
Derivative, Gain (Loss) on Derivative, Net (108) 46 12
Realized Investment Gains Losses      
Schedule of Investments [Line Items]      
Equity Securities, FV-NI, Unrealized Gain (Loss) 17 (108) 155
Other investments      
Schedule of Investments [Line Items]      
Other, net (118) 11 39
Total fixed maturities      
Schedule of Investments [Line Items]      
Debt Securities, Available-for-Sale, Realized Gain 30 57 319
Debt Securities, Available-for-sale, Realized Loss (149) (315) (89)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) (14) (18) 4
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Sell before Recovery 0 6 0
Equity Securities [Member]      
Schedule of Investments [Line Items]      
Equity Securities, FV-NI, Realized Gain (Loss) 100 (83) 81
Equity Securities, FV-NI, Unrealized Gain (Loss) (22) (266) 146
Debt and Equity Securities, Gain (Loss) 78 (349) 227
Mortgage loans      
Schedule of Investments [Line Items]      
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) $ (15) $ (7) $ 9