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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, 2025
Dec. 31, 2024
Dec. 31, 2023
Liability for Future Policy Benefit, Activity [Line Items]      
Balance $ 9,401 $ 9,117  
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]      
Beginning balance 1,847 1,953  
Beginning balance at original discount rate 1,905 1,950  
Effect of changes in cash flow assumptions   (27) $ 73
Effect of actual variances from expected experience   (25) (55)
Adjusted beginning of year balance   1,853 1,968
Issuances 156 273  
Interest accrual 69 97  
Net premiums collected (270) (433)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 1,808 1,905  
Effect of changes in discount rate assumptions (7) (58)  
Ending balance 1,801 1,847  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Beginning balance 9,258 9,711  
Beginning balance at original discount rate 9,585 9,641  
Effect of changes in cash flow assumptions   (7) 40
Effect of actual variances from expected experience   (40) (97)
Adjusted beginning of year balance   9,538 9,584
Issuances 156 273  
Interest accrual 358 486  
Benefit payments (568) (758)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 9,484 9,585  
Effect of changes in discount rate assumptions (30) (327)  
Ending balance 9,454 9,258  
Adjustment due to reserve flooring 8 7  
Net liability for future policy benefits 7,661 7,418  
Less: reinsurance recoverable 3,848 3,794  
Net liability for future policy benefits, after reinsurance recoverable 3,813 3,624  
Discounted expected future gross premiums 3,694 3,755  
Expected future gross premiums 5,566 5,830  
Expected future benefit payments 15,273 15,553  
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 107 201  
Interest accrual 0 1  
Net premiums collected (107) (202)  
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 1,204 1,164  
Beginning balance at original discount rate 1,289 1,222  
Effect of changes in cash flow assumptions   (2) (24)
Effect of actual variances from expected experience   (5) (8)
Adjusted beginning of year balance   1,282 1,190
Issuances 107 201  
Interest accrual 43 56  
Benefit payments (122) (158)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 1,310 1,289  
Effect of changes in discount rate assumptions (43) (85)  
Ending balance 1,267 1,204  
Adjustment due to reserve flooring 0 0  
Net liability for future policy benefits 1,267 1,204  
Less: reinsurance recoverable 722 759  
Net liability for future policy benefits, after reinsurance recoverable 545 445  
Discounted expected future gross premiums 0 0  
Expected future gross premiums 0 0  
Expected future benefit payments $ 1,891 $ 1,846  
Weighted average interest accretion rate 4.40% 4.50%  
Weighted average discount rate 5.00% 5.40%  
Weighted average duration of liability (in years) 6 years 6 years  
Term and Whole Life Insurance      
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]      
Beginning balance $ 737 $ 703  
Beginning balance at original discount rate 774 708  
Effect of changes in cash flow assumptions   0 57
Effect of actual variances from expected experience   (11) (16)
Adjusted beginning of year balance   763 749
Issuances 43 63  
Interest accrual 29 38  
Net premiums collected (59) (76)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 776 774  
Effect of changes in discount rate assumptions (15) (37)  
Ending balance 761 737  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Beginning balance 1,322 1,325  
Beginning balance at original discount rate 1,353 1,291  
Effect of changes in cash flow assumptions   0 67
Effect of actual variances from expected experience   (11) (16)
Adjusted beginning of year balance   1,342 1,342
Issuances 44 63  
Interest accrual 55 73  
Benefit payments (89) (125)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 1,352 1,353  
Effect of changes in discount rate assumptions 7 (31)  
Ending balance 1,359 1,322  
Adjustment due to reserve flooring 8 7  
Net liability for future policy benefits 606 592  
Less: reinsurance recoverable 438 424  
Net liability for future policy benefits, after reinsurance recoverable 168 168  
Discounted expected future gross premiums 1,670 1,672  
Expected future gross premiums 2,827 2,921  
Expected future benefit payments $ 2,279 $ 2,286  
Weighted average interest accretion rate 6.00% 6.00%  
Weighted average discount rate 5.20% 5.60%  
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 $ 53 $ 104  
Beginning balance at original discount rate 59 105  
Effect of changes in cash flow assumptions   (19) (39)
Effect of actual variances from expected experience   (9) (13)
Adjusted beginning of year balance   31 53
Issuances 6 9  
Interest accrual 1 3  
Net premiums collected (1) (6)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 37 59  
Effect of changes in discount rate assumptions (4) (6)  
Ending balance 33 53  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Beginning balance 545 661  
Beginning balance at original discount rate 535 621  
Effect of changes in cash flow assumptions   (30) (61)
Effect of actual variances from expected experience   (18) (25)
Adjusted beginning of year balance   487 535
Issuances 5 9  
Interest accrual 23 34  
Benefit payments (30) (43)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 485 535  
Effect of changes in discount rate assumptions 25 10  
Ending balance 510 545  
Adjustment due to reserve flooring 0 0  
Net liability for future policy benefits 477 492  
Less: reinsurance recoverable 20 20  
Net liability for future policy benefits, after reinsurance recoverable 457 472  
Discounted expected future gross premiums 821 836  
Expected future gross premiums 1,143 1,196  
Expected future benefit payments $ 802 $ 899  
Weighted average interest accretion rate 6.30% 6.30%  
Weighted average discount rate 5.30% 5.60%  
Weighted average duration of liability (in years) 6 years 7 years  
Long Term Care Insurance      
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]      
Beginning balance $ 1,057 $ 1,146  
Beginning balance at original discount rate 1,072 1,137  
Effect of changes in cash flow assumptions   (8) 55
Effect of actual variances from expected experience   (5) (26)
Adjusted beginning of year balance   1,059 1,166
Issuances 0 0  
Interest accrual 39 55  
Net premiums collected (103) (149)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 995 1,072  
Effect of changes in discount rate assumptions 12 (15)  
Ending balance 1,007 1,057  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Beginning balance 6,187 6,561  
Beginning balance at original discount rate 6,408 6,507  
Effect of changes in cash flow assumptions   25 58
Effect of actual variances from expected experience   (6) (48)
Adjusted beginning of year balance   6,427 $ 6,517
Issuances 0 0  
Interest accrual 237 323  
Benefit payments (327) (432)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 6,337 6,408  
Effect of changes in discount rate assumptions (19) (221)  
Ending balance 6,318 6,187  
Adjustment due to reserve flooring 0 0  
Net liability for future policy benefits 5,311 5,130  
Less: reinsurance recoverable 2,668 2,591  
Net liability for future policy benefits, after reinsurance recoverable 2,643 2,539  
Discounted expected future gross premiums 1,203 1,247  
Expected future gross premiums 1,596 1,713  
Expected future benefit payments $ 10,301 $ 10,522  
Weighted average interest accretion rate 5.00% 5.00%  
Weighted average discount rate 5.30% 5.70%  
Weighted average duration of liability (in years) 8 years 8 years