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Investments - Fixed Maturities and Equity Securities, Repurchase Agreement, Securities Lending, VIEs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Available-for-sale Securities Including Securities Pledged [Line Items]    
Rate required of collateral as a percent of market value of loans securities 102.00%  
Payables under securities loan and repurchase agreements, including collateral held $ 897 $ 692
Collateral Pledged    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Securities Sold under Agreements to Repurchase, Asset 0  
Securities pledged, Gross Unrealized Capital Losses 1,089 798
Payables under securities loan agreement, including collateral held    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Payables under securities loan and repurchase agreements, including collateral held 581 499
Securities Loaned    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Fair value of loaned securities 871 645
Collateral Securities Repledged, Delivered, or Used 133 153
Securities Pledged under repurchase agreements, carrying value 85 0
U.S. Treasuries    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Payables under securities loan and repurchase agreements, including collateral held 7 12
U.S. corporate public securities    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Payables under securities loan and repurchase agreements, including collateral held 461 438
Foreign corporate public securities and foreign governments    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Payables under securities loan and repurchase agreements, including collateral held 217 189
Payables under securities loan agreements    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Payables under securities loan and repurchase agreements, including collateral held 901 670
Fixed maturities | Collateral Pledged    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Securities pledged, Gross Unrealized Capital Losses 1,089 798
Short-term investments    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Payables under securities loan and repurchase agreements, including collateral held $ 216 $ 31