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Accumulated Other Comprehensive Income (Loss) by Component (Schedule of Accumulated Other Comprehensive Income (Loss) by Component) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Total stockholder's equity at beginning of period | $ 9,893 | $ 8,548 |  |
Other comprehensive income (loss) before reclassifications | 284 | 827 | $ (2,383) |
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | (397) | (99) | (145) |
Other comprehensive income (loss) after tax (expense) benefit | 681 | 926 | (2,238) |
Total stockholder's equity at end of period | 10,513 | 9,893 | 8,548 |
Cumulative effect adjustments from changes in accounting guidance, tax |  |  | 11 | $ 446
Reclassification from AOCI, tax | 106 | 26 | 26 |
Tax (expense) benefit on other comprehensive income (loss) | (210) | (235) | 568 |
Accumulated other comprehensive income (loss) |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Total stockholder's equity at beginning of period | (2,672) | (3,598) | (1,360) |
Total stockholder's equity at end of period | (1,991) | (2,672) | (3,598) | (1,360)
Accumulated other comprehensive income (loss) | Previously Reported |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Total stockholder's equity at beginning of period | (2,672) | (3,557) | 320 |
Total stockholder's equity at end of period |  | (2,672) | (3,557) | 320
Accumulated other comprehensive income (loss) | Revision of Prior Period, Accounting Standards Update, Adjustment |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Total stockholder's equity at beginning of period | 0 | (41) | (1,680) |
Total stockholder's equity at end of period |  | 0 | (41) | (1,680)
Net unrealized gains (losses) on investments | Net unrealized gains (losses) on investments with an allowance for credit losses |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Total stockholder's equity at beginning of period | (12) | (7) | (2) |
Other comprehensive income (loss) before reclassifications | (34) | (24) | 0 |
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | (33) | (19) | 5 |
Other comprehensive income (loss) after tax (expense) benefit | (1) | (5) | (5) |
Total stockholder's equity at end of period | (13) | (12) | (7) | (2)
Cumulative effect adjustments from changes in accounting guidance, tax |  |  | 0 | 0
Reclassification from AOCI, tax | 9 | 5 | (1) |
Tax (expense) benefit on other comprehensive income (loss) | 0 | 1 | 1 |
Net unrealized gains (losses) on investments | Net unrealized gains (losses) on investments with an allowance for credit losses | Previously Reported |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Total stockholder's equity at beginning of period |  | (7) | (2) |
Total stockholder's equity at end of period |  |  | (7) | (2)
Net unrealized gains (losses) on investments | Net unrealized gains (losses) on investments with an allowance for credit losses | Revision of Prior Period, Accounting Standards Update, Adjustment |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Total stockholder's equity at beginning of period |  | 0 | 0 |
Total stockholder's equity at end of period |  |  | 0 | 0
Net unrealized gains (losses) on investments | Net unrealized gains and losses on other investments |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Total stockholder's equity at beginning of period | (1,613) | (2,738) | 3,359 |
Other comprehensive income (loss) before reclassifications | (310) | 1,072 | (6,223) |
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | (47) | (53) | (126) |
Other comprehensive income (loss) after tax (expense) benefit | (263) | 1,125 | (6,097) |
Total stockholder's equity at end of period | (1,876) | (1,613) | (2,738) | 3,359
Cumulative effect adjustments from changes in accounting guidance, tax |  |  | 0 | (617)
Reclassification from AOCI, tax | 13 | 14 | 21 |
Tax (expense) benefit on other comprehensive income (loss) | 68 | (304) | 1,622 |
Net unrealized gains (losses) on investments | Net unrealized gains and losses on other investments | Previously Reported |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Total stockholder's equity at beginning of period |  | (2,738) | 1,039 |
Total stockholder's equity at end of period |  |  | (2,738) | 1,039
Net unrealized gains (losses) on investments | Net unrealized gains and losses on other investments | Revision of Prior Period, Accounting Standards Update, Adjustment |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Total stockholder's equity at beginning of period |  | 0 | 2,320 |
Total stockholder's equity at end of period |  |  | 0 | 2,320
Pension and postretirement benefits |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Total stockholder's equity at beginning of period | (525) | (591) | (604) |
Other comprehensive income (loss) before reclassifications | 17 | 39 | (11) |
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | (317) | (27) | (24) |
Other comprehensive income (loss) after tax (expense) benefit | 334 | 66 | 13 |
Total stockholder's equity at end of period | (191) | (525) | (591) | (604)
Cumulative effect adjustments from changes in accounting guidance, tax |  |  | 0 | 0
Reclassification from AOCI, tax | 84 | 7 | 6 |
Tax (expense) benefit on other comprehensive income (loss) | (89) | (17) | (3) |
Pension and postretirement benefits | Previously Reported |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Total stockholder's equity at beginning of period |  | (591) | (604) |
Total stockholder's equity at end of period |  |  | (591) | (604)
Pension and postretirement benefits | Revision of Prior Period, Accounting Standards Update, Adjustment |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Total stockholder's equity at beginning of period |  | 0 | 0 |
Total stockholder's equity at end of period |  |  | 0 | 0
Cumulative impact of changes in discount rates used to measure long duration contracts |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Total stockholder's equity at beginning of period | (359) | (41) | (4,000) |
Other comprehensive income (loss) before reclassifications | 712 | (318) | 3,959 |
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | 0 | 0 | 0 |
Other comprehensive income (loss) after tax (expense) benefit | 712 | (318) | 3,959 |
Total stockholder's equity at end of period | 353 | (359) | (41) | (4,000)
Cumulative effect adjustments from changes in accounting guidance, tax |  |  | 11 | 1,063
Reclassification from AOCI, tax | 0 |  | 0 |
Tax (expense) benefit on other comprehensive income (loss) | (189) | 85 | (1,052) |
Cumulative impact of changes in discount rates used to measure long duration contracts | Previously Reported |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Total stockholder's equity at beginning of period |  | 0 | 0 |
Total stockholder's equity at end of period |  |  | 0 | 0
Cumulative impact of changes in discount rates used to measure long duration contracts | Revision of Prior Period, Accounting Standards Update, Adjustment |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Total stockholder's equity at beginning of period |  | (41) | (4,000) |
Total stockholder's equity at end of period |  |  | (41) | (4,000)
Cumulative foreign currency translation adjustment |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Total stockholder's equity at beginning of period | (163) | (221) | (113) |
Other comprehensive income (loss) before reclassifications | (101) | 58 | (108) |
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | 0 | 0 | 0 |
Other comprehensive income (loss) after tax (expense) benefit | (101) | 58 | (108) |
Total stockholder's equity at end of period | (264) | (163) | (221) | (113)
Cumulative effect adjustments from changes in accounting guidance, tax |  |  | 0 | 0
Reclassification from AOCI, tax | 0 | 0 | 0 |
Tax (expense) benefit on other comprehensive income (loss) | $ 0 | 0 | 0 |
Cumulative foreign currency translation adjustment | Previously Reported |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Total stockholder's equity at beginning of period |  | (221) | (113) |
Total stockholder's equity at end of period |  |  | (221) | (113)
Cumulative foreign currency translation adjustment | Revision of Prior Period, Accounting Standards Update, Adjustment |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Total stockholder's equity at beginning of period |  | $ 0 | 0 |
Total stockholder's equity at end of period |  |  | $ 0 | $ 0

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