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Investments (excluding Consolidated Investment Entities) - Repurchase Agreements and Securities Pledged (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Securities Financing Transaction [Line Items]    
Initial collateral required, percent of market value of loaned securities 102.00%  
Payables under securities loan and repurchase agreements, including collateral held $ 1,486 $ 1,309
U.S. Treasuries    
Securities Financing Transaction [Line Items]    
Payables under securities loan and repurchase agreements, including collateral held 31 22
U.S. corporate public securities    
Securities Financing Transaction [Line Items]    
Payables under securities loan and repurchase agreements, including collateral held 417 601
Short-term Investments    
Securities Financing Transaction [Line Items]    
Payables under securities loan and repurchase agreements, including collateral held 13 241
Foreign corporate public securities and foreign governments    
Securities Financing Transaction [Line Items]    
Payables under securities loan and repurchase agreements, including collateral held 321 258
Total collateral held    
Securities Financing Transaction [Line Items]    
Payables under securities loan and repurchase agreements, including collateral held 782 1,122
Collateral Pledged    
Securities Financing Transaction [Line Items]    
Securities pledged 1,393 1,523
Collateral Pledged | Fixed maturities    
Securities Financing Transaction [Line Items]    
Securities pledged 1,393 1,516
Collateral Pledged | fixed maturities and other investment    
Securities Financing Transaction [Line Items]    
Securities pledged   1,523
Securities pledged    
Securities Financing Transaction [Line Items]    
Securities pledged/obligations under repurchase agreements 482 281
Securities loaned to lending agent 755 1,083
Securities pledged as collateral 156 159
Short-term Investments    
Securities Financing Transaction [Line Items]    
Securities received as collateral $ 757 $ 736