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Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period | $ 15,314 | $ 16,576 | $ 15,201 | $ 17,471 |  |  |
Other comprehensive income (loss) before reclassifications, after tax | (136) | (798) | 126 | (1,809) |  |  |
Reclassification of (gains) losses from accumulated other comprehensive loss, after tax | 27 | 20 | 54 | 29 |  |  |
Other comprehensive income (loss) | (109) | (778) | 180 | (1,780) |  |  |
Amounts attributable to noncontrolling interests | 11 | 81 | (20) | 187 |  |  |
Balance at end of period | 15,470 | 15,714 | 15,470 | 15,714 |  |  |
As Reported |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period |  | 17,695 | 15,478 | 19,175 |  |  |
Other comprehensive income (loss) |  | (1,405) |  | (3,010) |  |  |
Effect of Adoption |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period |  | (1,119) | (277) | (1,704) |  |  |
Other comprehensive income (loss) |  | 627 |  | 1,230 |  |  |
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 | (14) | (6) | (7) | (2) |  |  |
Other comprehensive income (loss) before reclassifications, after tax | (8) | (1) | (16) | (5) |  |  |
Reclassification of (gains) losses from accumulated other comprehensive loss, after tax | 7 | (1) | 7 | (1) |  |  |
Other comprehensive income (loss) | (1) | (2) | (9) | (6) |  |  |
Amounts attributable to noncontrolling interests | (1) | 1 | 0 | 1 |  |  |
Balance at end of period | (16) | (7) | (16) | (7) |  |  |
Other comprehensive income (loss) before reclassifications, tax | 2 | (1) | 4 | 0 |  |  |
Reclassification from AOCI, current period, tax | (2) | 1 | (2) | 1 |  |  |
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] |  |  |  |  |  |  |
Cumulative effect adjustments from changes in accounting standards |  |  |  |  | $ 0 | $ 0 | $ 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 |  | (6) | (7) | (2) |  |  |
Net Unrealized Gains (Losses) on Other Investments |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period | (1,867) | 641 | (2,469) | 3,009 |  |  |
Other comprehensive income (loss) before reclassifications, after tax | (427) | (2,240) | 225 | (4,884) |  |  |
Reclassification of (gains) losses from accumulated other comprehensive loss, after tax | 14 | 14 | 32 | 15 |  |  |
Other comprehensive income (loss) | (413) | (2,226) | 257 | (4,869) |  |  |
Amounts attributable to noncontrolling interests | 42 | 229 | (26) | 504 |  |  |
Balance at end of period | (2,238) | (1,356) | (2,238) | (1,356) |  |  |
Other comprehensive income (loss) before reclassifications, tax | 116 | 593 | (60) | 1,292 |  |  |
Reclassification from AOCI, current period, tax | (4) | (3) | (8) | (4) |  |  |
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] |  |  |  |  |  |  |
Cumulative effect adjustments from changes in accounting standards |  |  |  |  | 0 | 270 | 617
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 |  | (513) | (2,469) | 930 |  |  |
Net Unrealized Gains (Losses) on Other Investments | Effect of Adoption |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period |  | 1,154 |  | 2,079 |  |  |
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 | (393) | (2,119) | (36) | (3,585) |  |  |
Other comprehensive income (loss) before reclassifications, after tax | 256 | 1,507 | (140) | 3,142 |  |  |
Reclassification of (gains) losses from accumulated other comprehensive loss, after tax |  |  |  |  |  |  |
Other comprehensive income (loss) | 256 | 1,507 | (140) | 3,142 |  |  |
Amounts attributable to noncontrolling interests | (26) | (156) | 13 | (325) |  |  |
Balance at end of period | (163) | (768) | (163) | (768) |  |  |
Other comprehensive income (loss) before reclassifications, tax | (68) | (400) | 37 | (835) |  |  |
Reclassification from AOCI, current period, 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] |  |  |  |  |  |  |
Cumulative effect adjustments from changes in accounting standards |  |  |  |  | 11 | (497) | (1,063)
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 | 0 | 0 |  |  |
Cumulative impact of changes in discount rates used to measure long duration contracts | Effect of Adoption |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period |  | (2,119) | (36) | (3,585) |  |  |
Unrealized Gains (Losses) on Cash Flow Hedges |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period | 12 | 12 | 14 | (6) |  |  |
Other comprehensive income (loss) before reclassifications, after tax | 8 | 6 | 6 | 21 |  |  |
Reclassification of (gains) losses from accumulated other comprehensive loss, after tax |  |  |  | 3 |  |  |
Other comprehensive income (loss) | 8 | 6 | 6 | 24 |  |  |
Amounts attributable to noncontrolling interests |  |  |  |  |  |  |
Balance at end of period | 20 | 18 | 20 | 18 |  |  |
Other comprehensive income (loss) before reclassifications, tax | 0 | 5 | 1 | 3 |  |  |
Reclassification from AOCI, current period, tax | 0 | 2 | 0 | 1 |  |  |
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] |  |  |  |  |  |  |
Cumulative effect adjustments from changes in accounting standards |  |  |  |  | 0 | 0 | 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 |  | 12 | 14 | (6) |  |  |
Pension and Postretirement Benefits |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period | (614) | (630) | (622) | (636) |  |  |
Other comprehensive income (loss) before reclassifications, after tax |  | (2) |  |  |  |  |
Reclassification of (gains) losses from accumulated other comprehensive loss, after tax | 6 | 7 | 15 | 12 |  |  |
Other comprehensive income (loss) | 6 | 5 | 15 | 12 |  |  |
Amounts attributable to noncontrolling interests | (1) |  | (2) | (1) |  |  |
Balance at end of period | (609) | (625) | (609) | (625) |  |  |
Other comprehensive income (loss) before reclassifications, tax | 0 | 2 | 0 | 0 |  |  |
Reclassification from AOCI, current period, tax | (2) | (1) | (4) | (3) |  |  |
Pension and Postretirement Benefits | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Cumulative effect adjustments from changes in accounting standards |  |  |  |  | 0 | 0 | 0
Pension and Postretirement Benefits | As Reported |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period |  | (630) | (622) | (636) |  |  |
Foreign Currency Translation |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period | (186) | (114) | (200) | (100) |  |  |
Other comprehensive income (loss) before reclassifications, after tax | 35 | (68) | 51 | (83) |  |  |
Reclassification of (gains) losses from accumulated other comprehensive loss, after tax |  |  |  |  |  |  |
Other comprehensive income (loss) | 35 | (68) | 51 | (83) |  |  |
Amounts attributable to noncontrolling interests | (3) | 7 | (5) | 8 |  |  |
Balance at end of period | (154) | (175) | (154) | (175) |  |  |
Other comprehensive income (loss) before reclassifications, tax | 0 | 0 | 0 | 0 |  |  |
Reclassification from AOCI, current period, 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] |  |  |  |  |  |  |
Cumulative effect adjustments from changes in accounting standards |  |  |  |  | $ 0 | $ 0 | $ 0
Foreign Currency Translation | As Reported |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period |  | (114) | (200) | (100) |  |  |
Total Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period | (3,062) | (2,216) | (3,320) | (1,320) |  |  |
Balance at end of period | $ (3,160) | (2,913) | (3,160) | (2,913) |  |  |
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 |  | (1,251) | (3,284) | 186 |  |  |
Total Accumulated Other Comprehensive Income (Loss) | Effect of Adoption |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period |  | $ (965) | $ (36) | $ (1,506) |  |  |

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