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Investments - Internally Managed Investment Portfolio (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Aug. 31, 2023
Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items]      
Estimated fair value $ 6,267   $ 7,119
Fixed-maturity securities, trading 350   303
Short-term investments, at fair value 1,426   810
Other invested assets 765   133
Total investments 8,808   8,365
Externally managed      
Debt and Equity Securities, FV-NI [Line Items]      
Estimated fair value 5,316   5,824
Externally managed | Internal      
Debt and Equity Securities, FV-NI [Line Items]      
Estimated fair value 294   305
Loss Mitigation Securities      
Debt and Equity Securities, FV-NI [Line Items]      
Estimated fair value 495   548
Puerto Rico, New Recovery Bonds      
Debt and Equity Securities, FV-NI [Line Items]      
Estimated fair value 78   358
Puerto Rico, New Recovery Bonds | AGC And AGM      
Debt and Equity Securities, FV-NI [Line Items]      
Recovery bonds transferred   $ 68  
Other      
Debt and Equity Securities, FV-NI [Line Items]      
Estimated fair value 378   389
Other | Assured IM      
Debt and Equity Securities, FV-NI [Line Items]      
Estimated fair value $ 214   $ 232
Contingent Value Instruments | AGC And AGM      
Debt and Equity Securities, FV-NI [Line Items]      
Recovery bonds transferred   $ 5  
BIG      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed-maturity investments, non-investment grade, percent 7.60%   7.40%
Not Internally Rated      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed-maturity investments, non-investment grade, percent 2.40%   5.90%
Sound Point Capital Management, LP [Member]      
Debt and Equity Securities, FV-NI [Line Items]      
Other invested assets $ 419   $ 0
Equity method investments      
Debt and Equity Securities, FV-NI [Line Items]      
Other invested assets 331   123
Other      
Debt and Equity Securities, FV-NI [Line Items]      
Other invested assets $ 15   $ 10