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Investments (excluding Consolidated Investment Entities) - Repurchase Agreements and Securities Pledged (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
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 $ 1,215 $ 1,121
U.S. Treasuries    
Securities Financing Transaction [Line Items]    
Payables under securities loan and repurchase agreements, including collateral held 29 14
U.S. corporate public securities    
Securities Financing Transaction [Line Items]    
Payables under securities loan and repurchase agreements, including collateral held 607 568
Short-term Investments    
Securities Financing Transaction [Line Items]    
Payables under securities loan and repurchase agreements, including collateral held 11 55
Foreign corporate public securities and foreign governments    
Securities Financing Transaction [Line Items]    
Payables under securities loan and repurchase agreements, including collateral held 338 238
Total collateral held    
Securities Financing Transaction [Line Items]    
Payables under securities loan and repurchase agreements, including collateral held 985 875
Collateral Pledged    
Securities Financing Transaction [Line Items]    
Securities sold under agreements to repurchase, asset 0 0
Securities pledged 1,274 1,160
Collateral Pledged | Fixed maturities    
Securities Financing Transaction [Line Items]    
Securities pledged 1,274 1,160
Securities pledged    
Securities Financing Transaction [Line Items]    
Securities pledged/obligations under repurchase agreements 162 117
Securities loaned to lending agent 941 842
Securities pledged as collateral 171 201
Short-term Investments    
Securities Financing Transaction [Line Items]    
Securities received as collateral $ 723 $ 660