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Investments - Value of other securities measured at fair value based on election of the fair value option (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items]    
Fair Value [1] $ 4,840 $ 4,485
Equity securities [1] 515 575
Fixed Maturities And Equity Securities    
Debt and Equity Securities, FV-NI [Line Items]    
Total $ 5,355 $ 5,060
Fixed Maturities And Equity Securities | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk, percentage 100.00% 100.00%
Fixed maturity securities    
Debt and Equity Securities, FV-NI [Line Items]    
Fair Value $ 4,840 $ 4,485
Fixed maturity securities | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk, percentage 91.00% 89.00%
Fixed maturity securities | Obligations of states, municipalities and political subdivisions    
Debt and Equity Securities, FV-NI [Line Items]    
Fair Value $ 91 $ 111
Fixed maturity securities | Obligations of states, municipalities and political subdivisions | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk, percentage 2.00% 2.00%
Fixed maturity securities | Non-U.S. governments    
Debt and Equity Securities, FV-NI [Line Items]    
Fair Value $ 33 $ 66
Fixed maturity securities | Non-U.S. governments | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk, percentage 1.00% 1.00%
Fixed maturity securities | Corporate debt    
Debt and Equity Securities, FV-NI [Line Items]    
Fair Value $ 2,624 $ 2,392
Fixed maturity securities | Corporate debt | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk, percentage 49.00% 47.00%
Fixed maturity securities | Mortgage-backed, asset-backed and collateralized    
Debt and Equity Securities, FV-NI [Line Items]    
Fair Value $ 2,092 $ 1,916
Fixed maturity securities | Mortgage-backed, asset-backed and collateralized | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk, percentage 39.00% 39.00%
Fixed maturity securities | RMBS    
Debt and Equity Securities, FV-NI [Line Items]    
Fair Value $ 267 $ 286
Fixed maturity securities | RMBS | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk, percentage 5.00% 6.00%
Fixed maturity securities | CMBS    
Debt and Equity Securities, FV-NI [Line Items]    
Fair Value $ 278 $ 331
Fixed maturity securities | CMBS | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk, percentage 5.00% 7.00%
Fixed maturity securities | CLO/ABS    
Debt and Equity Securities, FV-NI [Line Items]    
Fair Value $ 1,547 $ 1,299
Fixed maturity securities | CLO/ABS | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk, percentage 29.00% 26.00%
Equity securities    
Debt and Equity Securities, FV-NI [Line Items]    
Equity securities $ 515 $ 575
Equity securities | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk, percentage 9.00% 11.00%
[1] See Note 10 for details of balances associated with variable interest entities.