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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
--- | ---
Mar. 31, 2025 | Mar. 31, 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 | 196 | $ 69
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | (10) | (31)
Other comprehensive income (loss) after tax (expense) benefit | 206 | 100
Total stockholder's equity at end of period | 10,279 | 9,662
Reclassification from AOCI, tax | 1 | 8
Tax (expense) benefit on other comprehensive income (loss) | (42) | (35)
Accumulated other comprehensive income (loss) |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Total stockholder's equity at beginning of period | (1,991) | (2,672)
Total stockholder's equity at end of period | (1,785) | (2,572)
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 | (13) | (12)
Other comprehensive income (loss) before reclassifications | (5) | (1)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | (2) | (3)
Other comprehensive income (loss) after tax (expense) benefit | (3) | 2
Total stockholder's equity at end of period | (16) | (10)
Reclassification from AOCI, tax | 0 | 1
Tax (expense) benefit on other comprehensive income (loss) | 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 | (1,876) | (1,613)
Other comprehensive income (loss) before reclassifications | 277 | (239)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | (6) | (22)
Other comprehensive income (loss) after tax (expense) benefit | 283 | (217)
Total stockholder's equity at end of period | (1,593) | (1,830)
Reclassification from AOCI, tax | 1 | 6
Tax (expense) benefit on other comprehensive income (loss) | (74) | 58
Pension and postretirement benefits |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Total stockholder's equity at beginning of period | (191) | (525)
Other comprehensive income (loss) before reclassifications | 0 | 0
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | (2) | (6)
Other comprehensive income (loss) after tax (expense) benefit | 2 | 6
Total stockholder's equity at end of period | (189) | (519)
Reclassification from AOCI, tax | 0 | 1
Tax (expense) benefit on other comprehensive income (loss) | 0 | (1)
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 | 353 | (359)
Other comprehensive income (loss) before reclassifications | (114) | 341
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | 0 | 0
Other comprehensive income (loss) after tax (expense) benefit | (114) | 341
Total stockholder's equity at end of period | 239 | (18)
Reclassification from AOCI, tax | 0 |
Tax (expense) benefit on other comprehensive income (loss) | 31 | (91)
Cumulative foreign currency translation adjustment |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Total stockholder's equity at beginning of period | (264) | (163)
Other comprehensive income (loss) before reclassifications | 38 | (32)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | 0 | 0
Other comprehensive income (loss) after tax (expense) benefit | 38 | (32)
Total stockholder's equity at end of period | (226) | (195)
Reclassification from AOCI, tax | 0 | 0
Tax (expense) benefit on other comprehensive income (loss) | $ 0 | $ 0

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