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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 |

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) (AOCI) from (increase) decrease in expected future policy benefit component of liability for future policy benefit from change in discount rate. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-13I Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29E Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480016/944-40-65-2 + Details
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