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Shareholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2024
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, 2023 and 2024:
| 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, 2023 | $ | (16) |  |  | $ | (2,238) |  |  | $ | (163) |  |  | $ | 20 |  |  | $ | (609) |  |  | $ | (154) |  |  | $ | (3,160) |
Other comprehensive income (loss) before reclassifications, after tax of $3, $295, $(217), $(2), $0 and $0 | (9) |  |  | (1,105) |  |  | 818 |  |  | (1) |  |  |  |  | (55) |  |  | (352) |
Reclassification of losses from accumulated other comprehensive loss, after tax of $(2), $(6), $0, $0, $(11) and $0 | 8 |  |  | 21 |  |  |  |  |  |  | 40 |  |  |  |  | 69 |
Other comprehensive income (loss) | (1) |  |  | (1,084) |  |  | 818 |  |  | (1) |  |  | 40 |  |  | (55) |  |  | (283) |
Amounts attributable to noncontrolling interests | 1 |  |  | 95 |  |  | (69) |  |  |  |  | (1) |  |  | 5 |  |  | 31 |
Purchase of CNA shares |  |  | (46) |  |  | (1) |  |  |  |  | (10) |  |  | (4) |  |  | (61) |
Balance, September 30, 2023 | $ | (16) |  |  | $ | (3,273) |  |  | $ | 585 |  |  | $ | 19 |  |  | $ | (580) |  |  | $ | (208) |  |  | $ | (3,473) |
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) |
| 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, 2023, as reported | $ | (7) |  |  | $ | (2,469) |  |  | $ | — |  |  | $ | 14 |  |  | $ | (622) |  |  | $ | (200) |  |  | $ | (3,284) |
Cumulative effect adjustments from changes in accounting standard s, after tax of $0, $0, $11, $0, $0 and $0 |  |  |  |  | (36) |  |  |  |  |  |  |  |  | (36) |
Balance, January 1, 2023, as adjusted | (7) |  |  | (2,469) |  |  | (36) |  |  | 14 |  |  | (622) |  |  | (200) |  |  | (3,320) |
Other comprehensive income (loss) before reclassifications, after tax of $7, $235, $(180), $(1), $0 and $0 | (25) |  |  | (880) |  |  | 678 |  |  | 5 |  |  |  |  | (4) |  |  | (226) |
Reclassification of losses from accumulated other comprehensive loss, after tax of $(4), $(14), $0, $0, $(15) and $0 | 15 |  |  | 53 |  |  |  |  |  |  | 55 |  |  |  |  | 123 |
Other comprehensive income (loss) | (10) |  |  | (827) |  |  | 678 |  |  | 5 |  |  | 55 |  |  | (4) |  |  | (103) |
Amounts attributable to noncontrolling interests | 1 |  |  | 69 |  |  | (56) |  |  |  |  | (3) |  |  |  |  | 11 |
Purchase of CNA shares |  |  | (46) |  |  | (1) |  |  |  |  | (10) |  |  | (4) |  |  | (61) |
Balance, September 30, 2023 | $ | (16) |  |  | $ | (3,273) |  |  | $ | 585 |  |  | $ | 19 |  |  | $ | (580) |  |  | $ | (208) |  |  | $ | (3,473) |
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) |
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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