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Shareholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2025
Equity [Abstract] |
Schedule of Components of Accumulated Other Comprehensive Income (Loss) | The tables below present the changes in Accumulated other comprehensive income (loss) (“AOCI”) by component for the three and nine months ended September 30, 2024 and 2025:
| Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses |  | Net Unrealized Gains (Losses) on Other Investments |  | Cumulative impact of changes in discount rates used to measure long duration contracts |  | Unrealized Gains (Losses) on Cash Flow Hedges |  | Pension and Postretirement Benefits |  | Foreign Currency Translation |  | Total Accumulated Other Comprehensive Income (Loss)
(In millions) |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, July 1, 2024 | $ | (10) |  |  | $ | (1,903) |  |  | $ | 234 |  |  | $ | 10 |  |  | $ | (525) |  |  | $ | (189) |  |  | $ | (2,383) |
Other comprehensive income (loss) before reclassifications, after tax of $3, $(337), $165, $3, $0 and $0 | (9) |  |  | 1,253 |  |  | (623) |  |  | (7) |  |  | 1 |  |  | 64 |  |  | 679 |
Reclassification of losses from accumulated other comprehensive loss, after tax of $(2), $(3), $0, $0, $(3) and $0 | 6 |  |  | 11 |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  | 25 |
Other comprehensive income (loss) | (3) |  |  | 1,264 |  |  | (623) |  |  | (7) |  |  | 9 |  |  | 64 |  |  | 704 |
Amounts attributable to noncontrolling interests |  |  |  | (105) |  |  | 52 |  |  |  |  |  | (1) |  |  | (5) |  |  | (59) |
Balance, September 30, 2024 | $ | (13) |  |  | $ | (744) |  |  | $ | (337) |  |  | $ | 3 |  |  | $ | (517) |  |  | $ | (130) |  |  | $ | (1,738) |
Balance, July 1, 2025 | $ | (15) |  |  | $ | (1,395) |  |  | $ | 217 |  |  | $ | 3 |  |  | $ | (222) |  |  | $ | (90) |  |  | $ | (1,502) |
Other comprehensive income (loss) before reclassifications, after tax of $1, $(148), $40, $2, $0 and $0 | (1) |  |  | 552 |  |  | (150) |  |  |  |  |  | (1) |  |  | (39) |  |  | 361 |
Reclassification of losses from accumulated other comprehensive loss, after tax of $(2), $0, $0, $0, $0 and $0 | 4 |  |  | 4 |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  | 10 |
Other comprehensive income (loss) | 3 |  |  | 556 |  |  | (150) |  |  | — |  |  | 1 |  |  | (39) |  |  | 371 |
Amounts attributable to noncontrolling interests |  |  |  | (45) |  |  | 12 |  |  |  |  |  |  |  |  | 3 |  |  | (30) |
Balance, September 30, 2025 | $ | (12) |  |  | $ | (884) |  |  | $ | 79 |  |  | $ | 3 |  |  | $ | (221) |  |  | $ | (126) |  |  | $ | (1,161) |
| Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses |  | Net Unrealized Gains (Losses) on Other Investments |  | Cumulative impact of changes in discount rates used to measure long duration contracts |  | Unrealized Gains (Losses) on Cash Flow Hedges |  | Pension and Postretirement Benefits |  | Foreign Currency Translation |  | Total Accumulated Other Comprehensive Income (Loss)
(In millions) |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, January 1, 2024 | $ | (12) |  |  | $ | (1,483) |  |  | $ | (329) |  |  | $ | 9 |  |  | $ | (533) |  |  | $ | (149) |  |  | $ | (2,497) |
Other comprehensive income (loss) before reclassifications, after tax of $4, $(206), $2, $3, $0 and $0 | (14) |  |  | 764 |  |  | (9) |  |  | (6) |  |  | 1 |  |  | 21 |  |  | 757 |
Reclassification of losses from accumulated other comprehensive loss, after tax of $(4), $(10), $0, $0, $(5) and $0 | 13 |  |  | 39 |  |  |  |  |  |  | 20 |  |  |  |  | 72 |
Other comprehensive income (loss) | (1) |  |  | 803 |  |  | (9) |  |  | (6) |  |  | 21 |  |  | 21 |  |  | 829 |
Amounts attributable to noncontrolling interests |  |  | (67) |  |  | 1 |  |  |  |  | (2) |  |  | (2) |  |  | (70) |
Other |  |  | 3 |  |  |  |  |  |  | (3) |  |  |  |  | — |
Balance, September 30, 2024 | $ | (13) |  |  | $ | (744) |  |  | $ | (337) |  |  | $ | 3 |  |  | $ | (517) |  |  | $ | (130) |  |  | $ | (1,738) |
Balance, January 1, 2025 | $ | (13) |  |  | $ | (1,720) |  |  | $ | 324 |  |  | $ | 9 |  |  | $ | (224) |  |  | $ | (243) |  |  | $ | (1,867) |
Other comprehensive income (loss) before reclassifications, after tax of $4, $(233), $71, $5, $0 and $0 | (11) |  |  | 872 |  |  | (267) |  |  | (6) |  |  | (2) |  |  | 128 |  |  | 714 |
Reclassification of losses from accumulated other comprehensive loss, after tax of $(4), $(11), $0, $0, $(1) and $0 | 12 |  |  | 40 |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  | 57 |
Other comprehensive income (loss) | 1 |  |  | 912 |  |  | (267) |  |  | (6) |  |  | 3 |  |  | 128 |  |  | 771 |
Amounts attributable to noncontrolling interests |  |  |  | (75) |  |  | 22 |  |  |  |  |  |  |  |  | (11) |  |  | (64) |
Other |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |
Balance, September 30, 2025 | $ | (12) |  |  | $ | (884) |  |  | $ | 79 |  |  | $ | 3 |  |  | $ | (221) |  |  | $ | (126) |  |  | $ | (1,161) |
Schedule of Reclassification out of Accumulated Other Comprehensive Income | Amounts reclassified from AOCI shown above are reported in Net income (loss) as follows:
Major Category of AOCI | Affected Line Item
Net unrealized gains (losses) on investments with an allowance for credit losses and Net unrealized gains (losses) on other investments | Investment gains (losses)
Unrealized gains (losses) on cash flow hedges | Operating revenues and other, Interest expense and Operating expenses and other
Pension and postretirement benefits | Operating expenses and other

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