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Investments (excluding Consolidated Investment Entities) - Repurchase Agreements and Securities Pledged (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 $ 1,309 $ 1,121
Collateral pledged    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Securities Sold under Agreements to Repurchase, Asset 0 0
Total securities pledged 1,523 1,160
Securities pledged    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Securities pledged/obligations under repurchase agreements 281 117
Securities loaned to lending agent 1,083 842
Securities pledged as collateral 159 201
Short-term investments    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Securities received as collateral 736 660
Fixed maturities | Collateral pledged    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Total securities pledged 1,516 1,160
U.S. Treasuries    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Payables under securities loan and repurchase agreements, including collateral held 22 14
U.S. corporate public securities    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Payables under securities loan and repurchase agreements, including collateral held 601 568
Short-term investments    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Payables under securities loan and repurchase agreements, including collateral held 241 55
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 258 238
Total    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Payables under securities loan and repurchase agreements, including collateral held 1,122 $ 875
fixed maturities and other investment | Collateral pledged    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Total securities pledged 1,523  
Other investments, including securities pledged | Collateral pledged    
Available-for-sale Securities, Including Securities Pledged [Line Items]    
Total securities pledged $ 7