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Future Policy Benefits - Changes in Liability for Future Policy Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Present Value of Expected Net Premiums:        
Balance, beginning of period   $ 3,145.0 $ 3,520.0  
Beginning balance at original discount rate   3,254.0 3,826.0  
Effect of changes in cash flow assumptions     195.0 $ (353.0)
Effect of actual variances from expected experience     (314.0) (57.0)
Adjusted beginning of period balance     3,135.0 3,416.0
Acquisition from business combination   0.0 0.0  
Issuances   1,325.0 1,074.0  
Interest accrual   97.0 129.0  
Net premiums collected   (1,550.0) (1,368.0)  
Derecognitions (lapses and withdrawals)   1.0 3.0  
Ending balance at original discount rate $ 3,008.0 3,008.0 3,254.0  
Effect of changes in discount rate assumptions (39.0) (39.0) (109.0)  
Balance, end of period 2,969.0 2,969.0 3,145.0  
Present Value of Expected Future Policy Benefits:        
Balance, beginning of period   7,253.0 6,618.0  
Beginning balance at original discount rate   7,494.0 7,243.0  
Effect of changes in cash flow assumptions     (185.0) (363.0)
Effect of actual variances from expected experience     (346.0) (84.0)
Adjusted beginning of period balance     6,963.0 6,796.0
Acquisition of business combination   311.0 0.0  
Issuances   1,344.0 1,077.0  
Interest accrual   250.0 261.0  
Benefit payments   (422.0) (645.0)  
Derecognitions (lapses and withdrawals)   4.0 5.0  
Ending balance at original discount rate 8,450.0 8,450.0 7,494.0  
Effect of changes in discount rate assumptions (85.0) (85.0) (241.0)  
Balance, end of period 8,365.0 8,365.0 7,253.0  
Liability for future policy benefits 5,396.0 5,396.0 4,108.0  
Less: Reinsurance recoverables (1,291.0) (1,291.0) (45.0)  
Net liability for future policy benefits, after reinsurance recoverable 4,105.0 4,105.0 4,063.0  
Liability remeasurement gains 15.0 15.0    
Annuity        
Present Value of Expected Net Premiums:        
Balance, beginning of period   0.0 0.0  
Beginning balance at original discount rate   0.0 0.0  
Effect of changes in cash flow assumptions     0.0 0.0
Effect of actual variances from expected experience     11.0 2.0
Adjusted beginning of period balance     11.0 2.0
Acquisition from business combination   0.0 0.0  
Issuances   1,287.0 984.0  
Interest accrual   10.0 8.0  
Net premiums collected   (1,306.0) (995.0)  
Derecognitions (lapses and withdrawals)   0.0 1.0  
Ending balance at original discount rate 2.0 2.0 0.0  
Effect of changes in discount rate assumptions 0.0 0.0 0.0  
Balance, end of period 2.0 2.0 0.0  
Present Value of Expected Future Policy Benefits:        
Balance, beginning of period   2,213.0 1,288.0  
Beginning balance at original discount rate   2,217.0 1,368.0  
Effect of changes in cash flow assumptions     0.0 (1.0)
Effect of actual variances from expected experience     11.0 (25.0)
Adjusted beginning of period balance     2,228.0 1,342.0
Acquisition of business combination   311.0 0.0  
Issuances   1,300.0 988.0  
Interest accrual   105.0 73.0  
Benefit payments   (199.0) (189.0)  
Derecognitions (lapses and withdrawals)   3.0 3.0  
Ending balance at original discount rate 3,748.0 3,748.0 2,217.0  
Effect of changes in discount rate assumptions 83.0 83.0 (4.0)  
Balance, end of period 3,831.0 3,831.0 2,213.0  
Liability for future policy benefits 3,829.0 3,829.0 2,213.0  
Less: Reinsurance recoverables (3.0) (3.0) 0.0  
Net liability for future policy benefits, after reinsurance recoverable $ 3,826.0 $ 3,826.0 $ 2,213.0  
Weighted-average liability duration of future policy benefits (years) 8 years 8 years 8 years  
Weighted average interest accretion rate 5.12% 5.12% 4.94%  
Weighted average current discount rate 4.85% 4.85% 4.88%  
Life        
Present Value of Expected Net Premiums:        
Balance, beginning of period   $ 3,145.0 $ 3,520.0  
Beginning balance at original discount rate   3,254.0 3,826.0  
Effect of changes in cash flow assumptions     195.0 (353.0)
Effect of actual variances from expected experience     (325.0) (59.0)
Adjusted beginning of period balance     3,124.0 3,414.0
Acquisition from business combination   0.0 0.0  
Issuances   38.0 90.0  
Interest accrual   87.0 121.0  
Net premiums collected   (244.0) (373.0)  
Derecognitions (lapses and withdrawals)   1.0 2.0  
Ending balance at original discount rate $ 3,006.0 3,006.0 3,254.0  
Effect of changes in discount rate assumptions (39.0) (39.0) (109.0)  
Balance, end of period 2,967.0 2,967.0 3,145.0  
Present Value of Expected Future Policy Benefits:        
Balance, beginning of period   5,040.0 5,330.0  
Beginning balance at original discount rate   5,277.0 5,875.0  
Effect of changes in cash flow assumptions     (185.0) (362.0)
Effect of actual variances from expected experience     (357.0) (59.0)
Adjusted beginning of period balance     4,735.0 $ 5,454.0
Acquisition of business combination   0.0 0.0  
Issuances   44.0 89.0  
Interest accrual   145.0 188.0  
Benefit payments   (223.0) (456.0)  
Derecognitions (lapses and withdrawals)   1.0 2.0  
Ending balance at original discount rate 4,702.0 4,702.0 5,277.0  
Effect of changes in discount rate assumptions (168.0) (168.0) (237.0)  
Balance, end of period 4,534.0 4,534.0 5,040.0  
Liability for future policy benefits 1,567.0 1,567.0 1,895.0  
Less: Reinsurance recoverables (1,288.0) (1,288.0) (45.0)  
Net liability for future policy benefits, after reinsurance recoverable $ 279.0 $ 279.0 $ 1,850.0  
Weighted-average liability duration of future policy benefits (years) 15 years 15 years 16 years  
Weighted average interest accretion rate 4.63% 4.63% 4.60%  
Weighted average current discount rate 5.05% 5.05% 5.03%