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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, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | $ 18,389 | $ 17,201 | $ 17,937 | $ 16,525
Other comprehensive income (loss) before reclassifications, after tax | 361 | 679 | 714 | 757
Reclassification of losses from accumulated other comprehensive loss, after tax | 10 | 25 | 57 | 72
Other comprehensive income (loss) | 371 | 704 | 771 | 829
Amounts attributable to noncontrolling interests | (30) | (59) | (64) | (70)
Other |  |  | (1) | 0
Balance at end of period | 19,223 | 18,248 | 19,223 | 18,248
Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss) before reclassifications, tax | 1 | 3 | 4 | 4
Reclassification of losses from accumulated other comprehensive loss, tax | (2) | (2) | (4) | (4)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (15) | (10) | (13) | (12)
Other comprehensive income (loss) before reclassifications, after tax | (1) | (9) | (11) | (14)
Reclassification of losses from accumulated other comprehensive loss, after tax | 4 | 6 | 12 | 13
Other comprehensive income (loss) | 3 | (3) | 1 | (1)
Amounts attributable to noncontrolling interests |  |  |  |
Other |  |  |  |
Balance at end of period | (12) | (13) | (12) | (13)
Net Unrealized Gains (Losses) on Other Investments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss) before reclassifications, tax | (148) | (337) | (233) | (206)
Reclassification of losses from accumulated other comprehensive loss, tax | 0 | (3) | (11) | (10)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (1,395) | (1,903) | (1,720) | (1,483)
Other comprehensive income (loss) before reclassifications, after tax | 552 | 1,253 | 872 | 764
Reclassification of losses from accumulated other comprehensive loss, after tax | 4 | 11 | 40 | 39
Other comprehensive income (loss) | 556 | 1,264 | 912 | 803
Amounts attributable to noncontrolling interests | (45) | (105) | (75) | (67)
Other |  |  | (1) | 3
Balance at end of period | (884) | (744) | (884) | (744)
Cumulative impact of changes in discount rates used to measure long duration contracts |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss) before reclassifications, tax | 40 | 165 | 71 | 2
Reclassification of losses from accumulated other comprehensive loss, tax | 0 | 0 | 0 | 0
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | 217 | 234 | 324 | (329)
Other comprehensive income (loss) before reclassifications, after tax | (150) | (623) | (267) | (9)
Reclassification of losses from accumulated other comprehensive loss, after tax |  |  |  |
Other comprehensive income (loss) | (150) | (623) | (267) | (9)
Amounts attributable to noncontrolling interests | 12 | 52 | 22 | 1
Other |  |  |  |
Balance at end of period | 79 | (337) | 79 | (337)
Unrealized Gains (Losses) on Cash Flow Hedges |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss) before reclassifications, tax | 2 | 3 | 5 | 3
Reclassification of losses from accumulated other comprehensive loss, tax | 0 | 0 | 0 | 0
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | 3 | 10 | 9 | 9
Other comprehensive income (loss) before reclassifications, after tax |  | (7) | (6) | (6)
Reclassification of losses from accumulated other comprehensive loss, after tax |  |  |  |
Other comprehensive income (loss) | 0 | (7) | (6) | (6)
Amounts attributable to noncontrolling interests |  |  |  |
Other |  |  |  |
Balance at end of period | 3 | 3 | 3 | 3
Pension and Postretirement Benefits |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss) before reclassifications, tax | 0 | 0 | 0 | 0
Reclassification of losses from accumulated other comprehensive loss, tax | 0 | (3) | (1) | (5)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (222) | (525) | (224) | (533)
Other comprehensive income (loss) before reclassifications, after tax | (1) | 1 | (2) | 1
Reclassification of losses from accumulated other comprehensive loss, after tax | 2 | 8 | 5 | 20
Other comprehensive income (loss) | 1 | 9 | 3 | 21
Amounts attributable to noncontrolling interests |  | (1) |  | (2)
Other |  |  |  | (3)
Balance at end of period | (221) | (517) | (221) | (517)
Foreign Currency Translation |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss) before reclassifications, tax | 0 | 0 | 0 | 0
Reclassification of losses from accumulated other comprehensive loss, tax | 0 | 0 | 0 | 0
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (90) | (189) | (243) | (149)
Other comprehensive income (loss) before reclassifications, after tax | (39) | 64 | 128 | 21
Reclassification of losses from accumulated other comprehensive loss, after tax |  |  |  |
Other comprehensive income (loss) | (39) | 64 | 128 | 21
Amounts attributable to noncontrolling interests | 3 | (5) | (11) | (2)
Other |  |  |  |
Balance at end of period | (126) | (130) | (126) | (130)
Accumulated Other Comprehensive Income (Loss) |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (1,502) | (2,383) | (1,867) | (2,497)
Other comprehensive income (loss) | 341 | 645 | 707 | 759
Balance at end of period | $ (1,161) | $ (1,738) | $ (1,161) | $ (1,738)

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