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Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period | $ 17,201 | $ 15,470 | $ 16,525 | $ 15,201 |
Other comprehensive income (loss) before reclassifications, after tax | 679 | (352) | 757 | (226) |
Reclassification of losses from accumulated other comprehensive loss, after tax | 25 | 69 | 72 | 123 |
Other comprehensive income (loss) | 704 | (283) | 829 | (103) |
Amounts attributable to noncontrolling interests | (59) | 31 | (70) | 11 |
Purchase of CNA shares/ Other |  | (61) | 0 | (61) |
Balance at end of period | 18,248 | 15,158 | 18,248 | 15,158 |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  | (277) |
As Reported |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  | 15,478 |
Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period | (10) | (16) | (12) | (7) |
Other comprehensive income (loss) before reclassifications, after tax | (9) | (9) | (14) | (25) |
Reclassification of losses from accumulated other comprehensive loss, after tax | 6 | 8 | 13 | 15 |
Other comprehensive income (loss) | (3) | (1) | (1) | (10) |
Amounts attributable to noncontrolling interests |  | 1 |  | 1 |
Purchase of CNA shares/ Other |  |  |  |  |
Balance at end of period | (13) | (16) | (13) | (16) |
Other comprehensive income (loss) before reclassifications, tax | 3 | 3 | 4 | 7 |
Reclassification of losses from accumulated other comprehensive loss, tax | (2) | (2) | (4) | (4) |
Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  |  |
Cumulative effect adjustments from changes in accounting standards, tax |  |  |  |  | $ 0
Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses | As Reported |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  | (7) |
Net Unrealized Gains (Losses) on Other Investments |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period | (1,903) | (2,238) | (1,483) | (2,469) |
Other comprehensive income (loss) before reclassifications, after tax | 1,253 | (1,105) | 764 | (880) |
Reclassification of losses from accumulated other comprehensive loss, after tax | 11 | 21 | 39 | 53 |
Other comprehensive income (loss) | 1,264 | (1,084) | 803 | (827) |
Amounts attributable to noncontrolling interests | (105) | 95 | (67) | 69 |
Purchase of CNA shares/ Other |  | (46) | 3 | (46) |
Balance at end of period | (744) | (3,273) | (744) | (3,273) |
Other comprehensive income (loss) before reclassifications, tax | (337) | 295 | (206) | 235 |
Reclassification of losses from accumulated other comprehensive loss, tax | (3) | (6) | (10) | (14) |
Net Unrealized Gains (Losses) on Other Investments | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  |  |
Cumulative effect adjustments from changes in accounting standards, tax |  |  |  |  | 0
Net Unrealized Gains (Losses) on Other Investments | As Reported |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  | (2,469) |
Cumulative impact of changes in discount rates used to measure long duration contracts |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period | 234 | (163) | (329) | (36) |
Other comprehensive income (loss) before reclassifications, after tax | (623) | 818 | (9) | 678 |
Reclassification of losses from accumulated other comprehensive loss, after tax |  |  |  |  |
Other comprehensive income (loss) | (623) | 818 | (9) | 678 |
Amounts attributable to noncontrolling interests | 52 | (69) | 1 | (56) |
Purchase of CNA shares/ Other |  | (1) |  | (1) |
Balance at end of period | (337) | 585 | (337) | 585 |
Other comprehensive income (loss) before reclassifications, tax | 165 | (217) | 2 | (180) |
Reclassification of losses from accumulated other comprehensive loss, tax | 0 | 0 | 0 | 0 |
Cumulative impact of changes in discount rates used to measure long duration contracts | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  | (36) |
Cumulative effect adjustments from changes in accounting standards, tax |  |  |  |  | 11
Cumulative impact of changes in discount rates used to measure long duration contracts | As Reported |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  | 0 |
Unrealized Gains (Losses) on Cash Flow Hedges |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period | 10 | 20 | 9 | 14 |
Other comprehensive income (loss) before reclassifications, after tax | (7) | (1) | (6) | 5 |
Reclassification of losses from accumulated other comprehensive loss, after tax |  |  |  |  |
Other comprehensive income (loss) | (7) | (1) | (6) | 5 |
Amounts attributable to noncontrolling interests |  |  |  |  |
Purchase of CNA shares/ Other |  |  |  |  |
Balance at end of period | 3 | 19 | 3 | 19 |
Other comprehensive income (loss) before reclassifications, tax | 3 | (2) | 3 | (1) |
Reclassification of losses from accumulated other comprehensive loss, tax | 0 | 0 | 0 | 0 |
Unrealized Gains (Losses) on Cash Flow Hedges | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  |  |
Cumulative effect adjustments from changes in accounting standards, tax |  |  |  |  | 0
Unrealized Gains (Losses) on Cash Flow Hedges | As Reported |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  | 14 |
Pension and Postretirement Benefits |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period | (525) | (609) | (533) | (622) |
Other comprehensive income (loss) before reclassifications, after tax | 1 |  | 1 |  |
Reclassification of losses from accumulated other comprehensive loss, after tax | 8 | 40 | 20 | 55 |
Other comprehensive income (loss) | 9 | 40 | 21 | 55 |
Amounts attributable to noncontrolling interests | (1) | (1) | (2) | (3) |
Purchase of CNA shares/ Other |  | (10) | (3) | (10) |
Balance at end of period | (517) | (580) | (517) | (580) |
Other comprehensive income (loss) before reclassifications, tax | 0 | 0 | 0 | 0 |
Reclassification of losses from accumulated other comprehensive loss, tax | (3) | (11) | (5) | (15) |
Pension and Postretirement Benefits | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  |  |
Cumulative effect adjustments from changes in accounting standards, tax |  |  |  |  | 0
Pension and Postretirement Benefits | As Reported |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  | (622) |
Foreign Currency Translation |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period | (189) | (154) | (149) | (200) |
Other comprehensive income (loss) before reclassifications, after tax | 64 | (55) | 21 | (4) |
Reclassification of losses from accumulated other comprehensive loss, after tax |  |  |  |  |
Other comprehensive income (loss) | 64 | (55) | 21 | (4) |
Amounts attributable to noncontrolling interests | (5) | 5 | (2) |  |
Purchase of CNA shares/ Other |  | (4) |  | (4) |
Balance at end of period | (130) | (208) | (130) | (208) |
Other comprehensive income (loss) before reclassifications, tax | 0 | 0 | 0 | 0 |
Reclassification of losses from accumulated other comprehensive loss, tax | 0 | 0 | 0 | 0 |
Foreign Currency Translation | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  |  |
Cumulative effect adjustments from changes in accounting standards, tax |  |  |  |  | $ 0
Foreign Currency Translation | As Reported |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  | (200) |
Total Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period | (2,383) | (3,160) | (2,497) | (3,320) |
Balance at end of period | $ (1,738) | $ (3,473) | $ (1,738) | (3,473) |
Total Accumulated Other Comprehensive Income (Loss) | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  | (36) |
Total Accumulated Other Comprehensive Income (Loss) | As Reported |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  |  | $ (3,284) |

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