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Accumulated Other Comprehensive Income (Loss) by Component (Schedule of Accumulated Other Comprehensive Income (Loss) by Component) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Total stockholder's equity at beginning of period |  |  | $ 10,513 |
Other comprehensive income (loss) before reclassifications | $ 162 | $ 9 | 358 | $ 78
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | (37) | (16) | (47) | (47)
Other comprehensive income (loss) after tax (expense) benefit | 199 | 25 | 405 | 125
Total stockholder's equity at end of period | 10,661 | 9,874 | 10,661 | 9,874
Reclassification from AOCI, tax | 13 | 3 | 14 | 11
Tax (expense) benefit on other comprehensive income (loss) | (23) | (7) | (65) | (42)
Accumulated other comprehensive income (loss) |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Total stockholder's equity at beginning of period | (1,785) | (2,572) | (1,991) | (2,672)
Total stockholder's equity at end of period | (1,586) | (2,547) | (1,586) | (2,547)
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 | (16) | (10) | (13) | (12)
Other comprehensive income (loss) before reclassifications | (5) | (4) | (10) | (5)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | (6) | (4) | (8) | (7)
Other comprehensive income (loss) after tax (expense) benefit | 1 | 0 | (2) | 2
Total stockholder's equity at end of period | (15) | (10) | (15) | (10)
Reclassification from AOCI, tax | 2 | 1 | 2 | 2
Tax (expense) benefit on other comprehensive income (loss) | 0 | 0 | 1 | (1)
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 | (1,593) | (1,830) | (1,876) | (1,613)
Other comprehensive income (loss) before reclassifications | 42 | (250) | 319 | (489)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | (30) | (6) | (36) | (28)
Other comprehensive income (loss) after tax (expense) benefit | 72 | (244) | 355 | (461)
Total stockholder's equity at end of period | (1,521) | (2,074) | (1,521) | (2,074)
Reclassification from AOCI, tax | 10 | 1 | 11 | 7
Tax (expense) benefit on other comprehensive income (loss) | (22) | 66 | (96) | 124
Pension and postretirement benefits |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Total stockholder's equity at beginning of period | (189) | (519) | (191) | (525)
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | (1) | (6) | (3) | (12)
Other comprehensive income (loss) after tax (expense) benefit | 1 | 6 | 3 | 12
Total stockholder's equity at end of period | (188) | (513) | (188) | (513)
Reclassification from AOCI, tax | 1 | 1 | 1 | 2
Tax (expense) benefit on other comprehensive income (loss) | (1) | (1) | (1) | (2)
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 | 239 | (18) | 353 | (359)
Other comprehensive income (loss) before reclassifications | (3) | 273 | (117) | 614
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | 0 | 0 | 0 | 0
Other comprehensive income (loss) after tax (expense) benefit | (3) | 273 | (117) | 614
Total stockholder's equity at end of period | 236 | 255 | 236 | 255
Reclassification from AOCI, tax | 0 | 0 | 0 |
Tax (expense) benefit on other comprehensive income (loss) | 0 | (72) | 31 | (163)
Cumulative foreign currency translation adjustment |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Total stockholder's equity at beginning of period | (226) | (195) | (264) | (163)
Other comprehensive income (loss) before reclassifications | 128 | (10) | 166 | (42)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | 0 | 0 | 0 | 0
Other comprehensive income (loss) after tax (expense) benefit | 128 | (10) | 166 | (42)
Total stockholder's equity at end of period | (98) | (205) | (98) | (205)
Reclassification from AOCI, tax | 0 | 0 | 0 | 0
Tax (expense) benefit on other comprehensive income (loss) | $ 0 | $ 0 | $ 0 | $ 0

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