v3.25.1
Investments - Other Investments by Notice Period (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Other Investments [Line Items]    
Equity investments [1] $ 759 $ 803
Other investments, at fair value [1] 4,206 4,188
Total Investments, excluding funds held by reinsured companies and equity method investments 13,825 13,612
Equity investments | Privately held    
Other Investments [Line Items]    
Equity investments 455 460
Private equity funds    
Other Investments [Line Items]    
Other investments, at fair value 1,949 1,926
Private credit funds    
Other Investments [Line Items]    
Other investments, at fair value 915 864
Real estate funds    
Other Investments [Line Items]    
Other investments, at fair value 427 401
Hedge funds    
Other Investments [Line Items]    
Other investments, at fair value 386 410
Fixed income funds    
Other Investments [Line Items]    
Other investments, at fair value 375 369
CLO equity funds    
Other Investments [Line Items]    
Other investments, at fair value 124 162
Measured Using NAV as Practical Expedient    
Other Investments [Line Items]    
Equity investments 71 71
Other investments, at fair value 3,785 3,764
Total Investments, excluding funds held by reinsured companies and equity method investments 3,930 3,906
Measured Using NAV as Practical Expedient | Equity investments | Privately held    
Other Investments [Line Items]    
Equity investments 71 $ 71
Measured Using NAV as Practical Expedient | Equity investments | Privately held | Less than 1 Year    
Other Investments [Line Items]    
Equity investments 0  
Measured Using NAV as Practical Expedient | Equity investments | Privately held | 1-2 years    
Other Investments [Line Items]    
Equity investments 0  
Measured Using NAV as Practical Expedient | Equity investments | Privately held | 2-3 years    
Other Investments [Line Items]    
Equity investments 0  
Measured Using NAV as Practical Expedient | Equity investments | Privately held | More than 3 years    
Other Investments [Line Items]    
Equity investments 0  
Measured Using NAV as Practical Expedient | Equity investments | Privately held | Not Eligible/ Restricted    
Other Investments [Line Items]    
Equity investments 71  
Measured Using NAV as Practical Expedient | Other investments and privately held equity investments    
Other Investments [Line Items]    
Total Investments, excluding funds held by reinsured companies and equity method investments 3,856  
Measured Using NAV as Practical Expedient | Other investments and privately held equity investments | Less than 1 Year    
Other Investments [Line Items]    
Total Investments, excluding funds held by reinsured companies and equity method investments 976  
Measured Using NAV as Practical Expedient | Other investments and privately held equity investments | 1-2 years    
Other Investments [Line Items]    
Total Investments, excluding funds held by reinsured companies and equity method investments 0  
Measured Using NAV as Practical Expedient | Other investments and privately held equity investments | 2-3 years    
Other Investments [Line Items]    
Total Investments, excluding funds held by reinsured companies and equity method investments 0  
Measured Using NAV as Practical Expedient | Other investments and privately held equity investments | More than 3 years    
Other Investments [Line Items]    
Total Investments, excluding funds held by reinsured companies and equity method investments 0  
Measured Using NAV as Practical Expedient | Other investments and privately held equity investments | Not Eligible/ Restricted    
Other Investments [Line Items]    
Total Investments, excluding funds held by reinsured companies and equity method investments 2,880  
Measured Using NAV as Practical Expedient | Private equity funds    
Other Investments [Line Items]    
Other investments, at fair value 1,949  
Measured Using NAV as Practical Expedient | Private equity funds | Less than 1 Year    
Other Investments [Line Items]    
Other investments, at fair value 69  
Measured Using NAV as Practical Expedient | Private equity funds | 1-2 years    
Other Investments [Line Items]    
Other investments, at fair value 0  
Measured Using NAV as Practical Expedient | Private equity funds | 2-3 years    
Other Investments [Line Items]    
Other investments, at fair value 0  
Measured Using NAV as Practical Expedient | Private equity funds | More than 3 years    
Other Investments [Line Items]    
Other investments, at fair value 0  
Measured Using NAV as Practical Expedient | Private equity funds | Not Eligible/ Restricted    
Other Investments [Line Items]    
Other investments, at fair value 1,880  
Measured Using NAV as Practical Expedient | Private credit funds    
Other Investments [Line Items]    
Other investments, at fair value 529  
Measured Using NAV as Practical Expedient | Private credit funds | Less than 1 Year    
Other Investments [Line Items]    
Other investments, at fair value 59  
Measured Using NAV as Practical Expedient | Private credit funds | 1-2 years    
Other Investments [Line Items]    
Other investments, at fair value 0  
Measured Using NAV as Practical Expedient | Private credit funds | 2-3 years    
Other Investments [Line Items]    
Other investments, at fair value 0  
Measured Using NAV as Practical Expedient | Private credit funds | More than 3 years    
Other Investments [Line Items]    
Other investments, at fair value 0  
Measured Using NAV as Practical Expedient | Private credit funds | Not Eligible/ Restricted    
Other Investments [Line Items]    
Other investments, at fair value 470  
Measured Using NAV as Practical Expedient | Real estate funds    
Other Investments [Line Items]    
Other investments, at fair value 427  
Measured Using NAV as Practical Expedient | Real estate funds | Less than 1 Year    
Other Investments [Line Items]    
Other investments, at fair value 0  
Measured Using NAV as Practical Expedient | Real estate funds | 1-2 years    
Other Investments [Line Items]    
Other investments, at fair value 0  
Measured Using NAV as Practical Expedient | Real estate funds | 2-3 years    
Other Investments [Line Items]    
Other investments, at fair value 0  
Measured Using NAV as Practical Expedient | Real estate funds | More than 3 years    
Other Investments [Line Items]    
Other investments, at fair value 0  
Measured Using NAV as Practical Expedient | Real estate funds | Not Eligible/ Restricted    
Other Investments [Line Items]    
Other investments, at fair value 427  
Measured Using NAV as Practical Expedient | Hedge funds    
Other Investments [Line Items]    
Other investments, at fair value 386  
Measured Using NAV as Practical Expedient | Hedge funds | Less than 1 Year    
Other Investments [Line Items]    
Other investments, at fair value 386  
Measured Using NAV as Practical Expedient | Hedge funds | 1-2 years    
Other Investments [Line Items]    
Other investments, at fair value 0  
Measured Using NAV as Practical Expedient | Hedge funds | 2-3 years    
Other Investments [Line Items]    
Other investments, at fair value 0  
Measured Using NAV as Practical Expedient | Hedge funds | More than 3 years    
Other Investments [Line Items]    
Other investments, at fair value 0  
Measured Using NAV as Practical Expedient | Hedge funds | Not Eligible/ Restricted    
Other Investments [Line Items]    
Other investments, at fair value 0  
Measured Using NAV as Practical Expedient | Fixed income funds    
Other Investments [Line Items]    
Other investments, at fair value 370  
Measured Using NAV as Practical Expedient | Fixed income funds | Less than 1 Year    
Other Investments [Line Items]    
Other investments, at fair value 339  
Measured Using NAV as Practical Expedient | Fixed income funds | 1-2 years    
Other Investments [Line Items]    
Other investments, at fair value 0  
Measured Using NAV as Practical Expedient | Fixed income funds | 2-3 years    
Other Investments [Line Items]    
Other investments, at fair value 0  
Measured Using NAV as Practical Expedient | Fixed income funds | More than 3 years    
Other Investments [Line Items]    
Other investments, at fair value 0  
Measured Using NAV as Practical Expedient | Fixed income funds | Not Eligible/ Restricted    
Other Investments [Line Items]    
Other investments, at fair value 31  
Measured Using NAV as Practical Expedient | CLO equity funds    
Other Investments [Line Items]    
Other investments, at fair value 124  
Measured Using NAV as Practical Expedient | CLO equity funds | Less than 1 Year    
Other Investments [Line Items]    
Other investments, at fair value 123  
Measured Using NAV as Practical Expedient | CLO equity funds | 1-2 years    
Other Investments [Line Items]    
Other investments, at fair value 0  
Measured Using NAV as Practical Expedient | CLO equity funds | 2-3 years    
Other Investments [Line Items]    
Other investments, at fair value 0  
Measured Using NAV as Practical Expedient | CLO equity funds | More than 3 years    
Other Investments [Line Items]    
Other investments, at fair value 0  
Measured Using NAV as Practical Expedient | CLO equity funds | Not Eligible/ Restricted    
Other Investments [Line Items]    
Other investments, at fair value $ 1  
[1] See Note 17 for additional information regarding related party transactions.