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Policyholder Account Balances, Future Policy Benefits and Claims - Balances of and Changes in Liability for Future Policy Benefits (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]      
Balance $ 9,536 $ 9,378  
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]      
Beginning balance 1,953 2,027  
Beginning balance at original discount rate 1,950 2,065  
Effect of changes in cash flow assumptions   73 $ (19)
Effect of actual variances from expected experience   (37) (23)
Adjusted beginning of year balance   1,986 2,023
Issuances 218 244  
Interest accrual 73 101  
Net premiums collected (339) (418)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 1,938 1,950  
Effect of changes in discount rate assumptions 23 3  
Ending balance 1,961 1,953  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Beginning balance 9,711 9,519  
Beginning balance at original discount rate 9,641 9,706  
Effect of changes in cash flow assumptions   40 (34)
Effect of actual variances from expected experience   (63) (35)
Adjusted beginning of year balance   9,618 9,637
Issuances 218 244  
Interest accrual 366 489  
Benefit payments (569) (729)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 9,633 9,641  
Effect of changes in discount rate assumptions 176 70  
Ending balance 9,809 9,711  
Adjustment due to reserve flooring 7 5  
Net liability for future policy benefits 7,855 7,763  
Less: reinsurance recoverable 4,032 4,080  
Net liability for future policy benefits, after reinsurance recoverable 3,823 3,683  
Discounted expected future gross premiums 3,980 3,993  
Expected future gross premiums 5,916 5,993  
Expected future benefit payments 15,679 15,810  
Life Contingent Payout Annuities      
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]      
Beginning balance 0 0  
Beginning balance at original discount rate 0 0  
Effect of changes in cash flow assumptions   0 0
Effect of actual variances from expected experience   0 0
Adjusted beginning of year balance   0 0
Issuances 166 177  
Interest accrual 0 1  
Net premiums collected (166) (178)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 0 0  
Effect of changes in discount rate assumptions 0 0  
Ending balance 0 0  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Beginning balance 1,164 1,065  
Beginning balance at original discount rate 1,222 1,155  
Effect of changes in cash flow assumptions   (24) 0
Effect of actual variances from expected experience   (7) (10)
Adjusted beginning of year balance   1,191 1,145
Issuances 166 177  
Interest accrual 42 50  
Benefit payments (118) (150)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 1,281 1,222  
Effect of changes in discount rate assumptions (34) (58)  
Ending balance 1,247 1,164  
Adjustment due to reserve flooring 0 0  
Net liability for future policy benefits 1,247 1,164  
Less: reinsurance recoverable 810 880  
Net liability for future policy benefits, after reinsurance recoverable 437 284  
Discounted expected future gross premiums 0 0  
Expected future gross premiums 0 0  
Expected future benefit payments $ 1,830 $ 1,726  
Weighted average interest accretion rate 4.50% 4.20%  
Weighted average discount rate 4.80% 4.90%  
Weighted average duration of liability (in years) 7 years 7 years  
Term and Whole Life Insurance      
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]      
Beginning balance $ 703 $ 686  
Beginning balance at original discount rate 708 708  
Effect of changes in cash flow assumptions   57 (19)
Effect of actual variances from expected experience   (8) (2)
Adjusted beginning of year balance   757 687
Issuances 46 55  
Interest accrual 28 36  
Net premiums collected (56) (70)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 775 708  
Effect of changes in discount rate assumptions 2 (5)  
Ending balance 777 703  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Beginning balance 1,325 1,319  
Beginning balance at original discount rate 1,291 1,313  
Effect of changes in cash flow assumptions   67 (18)
Effect of actual variances from expected experience   (6) (1)
Adjusted beginning of year balance   1,352 1,294
Issuances 46 56  
Interest accrual 55 73  
Benefit payments (98) (132)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 1,355 1,291  
Effect of changes in discount rate assumptions 43 34  
Ending balance 1,398 1,325  
Adjustment due to reserve flooring 7 5  
Net liability for future policy benefits 628 627  
Less: reinsurance recoverable 447 440  
Net liability for future policy benefits, after reinsurance recoverable 181 187  
Discounted expected future gross premiums 1,779 1,764  
Expected future gross premiums 2,950 2,938  
Expected future benefit payments $ 2,287 $ 2,166  
Weighted average interest accretion rate 6.10% 6.20%  
Weighted average discount rate 4.90% 5.10%  
Weighted average duration of liability (in years) 7 years 7 years  
Disability Income Insurance      
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]      
Beginning balance $ 104 $ 134  
Beginning balance at original discount rate 105 137  
Effect of changes in cash flow assumptions   (39) (19)
Effect of actual variances from expected experience   (10) (18)
Adjusted beginning of year balance   56 100
Issuances 6 12  
Interest accrual 4 5  
Net premiums collected (6) (12)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 60 105  
Effect of changes in discount rate assumptions (3) (1)  
Ending balance 57 104  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Beginning balance 661 696  
Beginning balance at original discount rate 621 669  
Effect of changes in cash flow assumptions   (61) (25)
Effect of actual variances from expected experience   (19) (29)
Adjusted beginning of year balance   541 615
Issuances 6 11  
Interest accrual 26 37  
Benefit payments (31) (42)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 542 621  
Effect of changes in discount rate assumptions 40 40  
Ending balance 582 661  
Adjustment due to reserve flooring 0 0  
Net liability for future policy benefits 525 557  
Less: reinsurance recoverable 22 22  
Net liability for future policy benefits, after reinsurance recoverable 503 535  
Discounted expected future gross premiums 881 904  
Expected future gross premiums 1,213 1,269  
Expected future benefit payments $ 912 $ 1,068  
Weighted average interest accretion rate 6.40% 6.10%  
Weighted average discount rate 4.90% 5.10%  
Weighted average duration of liability (in years) 8 years 8 years  
Long Term Care Insurance      
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]      
Beginning balance $ 1,146 $ 1,207  
Beginning balance at original discount rate 1,137 1,220  
Effect of changes in cash flow assumptions   55 19
Effect of actual variances from expected experience   (19) (3)
Adjusted beginning of year balance   1,173 1,236
Issuances 0 0  
Interest accrual 41 59  
Net premiums collected (111) (158)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 1,103 1,137  
Effect of changes in discount rate assumptions 24 9  
Ending balance 1,127 1,146  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Beginning balance 6,561 6,439  
Beginning balance at original discount rate 6,507 6,569  
Effect of changes in cash flow assumptions   58 9
Effect of actual variances from expected experience   (31) 5
Adjusted beginning of year balance   6,534 $ 6,583
Issuances 0 0  
Interest accrual 243 329  
Benefit payments (322) (405)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 6,455 6,507  
Effect of changes in discount rate assumptions 127 54  
Ending balance 6,582 6,561  
Adjustment due to reserve flooring 0 0  
Net liability for future policy benefits 5,455 5,415  
Less: reinsurance recoverable 2,753 2,738  
Net liability for future policy benefits, after reinsurance recoverable 2,702 2,677  
Discounted expected future gross premiums 1,320 1,325  
Expected future gross premiums 1,753 1,786  
Expected future benefit payments $ 10,650 $ 10,850  
Weighted average interest accretion rate 5.10% 5.00%  
Weighted average discount rate 5.00% 5.10%  
Weighted average duration of liability (in years) 8 years 8 years