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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 | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Total stockholder's equity at beginning of period | $ 9,893 |  |
Other comprehensive income (loss) before reclassifications | 69 | $ 265 |
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | (31) | (25) |
Other comprehensive income (loss) after tax (expense) benefit | 100 | 290 |
Total stockholder's equity at end of period | 9,662 | 8,667 |
Cumulative effect adjustments from changes in accounting guidance, tax |  |  | $ 11
Reclassification from AOCI, tax | 8 | 6 |
Tax (expense) benefit on other comprehensive income (loss) | (35) | (75) |
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) |
Total stockholder's equity at end of period | (2,572) | (3,308) | (3,598)
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) |
Total stockholder's equity at end of period |  |  | (3,557)
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) |
Total stockholder's equity at end of period |  |  | (41)
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) |
Other comprehensive income (loss) before reclassifications | (1) | (8) |
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | (3) | 0 |
Other comprehensive income (loss) after tax (expense) benefit | 2 | (8) |
Total stockholder's equity at end of period | (10) | (15) | (7)
Cumulative effect adjustments from changes in accounting guidance, tax |  |  | 0
Reclassification from AOCI, tax | 1 | 0 |
Tax (expense) benefit on other comprehensive income (loss) | (1) | 2 |
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) |
Total stockholder's equity at end of period |  |  | (7)
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 |
Total stockholder's equity at end of period |  |  | 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) |
Other comprehensive income (loss) before reclassifications | (239) | 652 |
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | (22) | (18) |
Other comprehensive income (loss) after tax (expense) benefit | (217) | 670 |
Total stockholder's equity at end of period | (1,830) | (2,068) | (2,738)
Cumulative effect adjustments from changes in accounting guidance, tax |  |  | 0
Reclassification from AOCI, tax | 6 | 4 |
Tax (expense) benefit on other comprehensive income (loss) | 58 | (180) |
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) |
Total stockholder's equity at end of period |  |  | (2,738)
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 |
Total stockholder's equity at end of period |  |  | 0
Pension and postretirement benefits |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Total stockholder's equity at beginning of period | (525) | (591) |
Other comprehensive income (loss) before reclassifications | 0 | 0 |
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | (6) | (7) |
Other comprehensive income (loss) after tax (expense) benefit | 6 | 7 |
Total stockholder's equity at end of period | (519) | (584) | (591)
Cumulative effect adjustments from changes in accounting guidance, tax |  |  | 0
Reclassification from AOCI, tax | 1 | 2 |
Tax (expense) benefit on other comprehensive income (loss) | (1) | (2) |
Pension and postretirement benefits | Previously Reported |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Total stockholder's equity at beginning of period |  | (591) |
Total stockholder's equity at end of period |  |  | (591)
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 |
Total stockholder's equity at end of period |  |  | 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) |
Other comprehensive income (loss) before reclassifications | 341 | (396) |
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | 0 | 0 |
Other comprehensive income (loss) after tax (expense) benefit | 341 | (396) |
Total stockholder's equity at end of period | (18) | (437) | (41)
Cumulative effect adjustments from changes in accounting guidance, tax |  |  | 11
Reclassification from AOCI, tax | 0 | 0 |
Tax (expense) benefit on other comprehensive income (loss) | (91) | 105 |
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 |
Total stockholder's equity at end of period |  |  | 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) |
Total stockholder's equity at end of period |  |  | (41)
Cumulative foreign currency translation adjustment |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Total stockholder's equity at beginning of period | (163) | (221) |
Other comprehensive income (loss) before reclassifications | (32) | 17 |
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | 0 | 0 |
Other comprehensive income (loss) after tax (expense) benefit | (32) | 17 |
Total stockholder's equity at end of period | (195) | (204) | (221)
Cumulative effect adjustments from changes in accounting guidance, tax |  |  | 0
Reclassification from AOCI, tax | 0 | 0 |
Tax (expense) benefit on other comprehensive income (loss) | $ 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) |
Total stockholder's equity at end of period |  |  | (221)
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 |
Total stockholder's equity at end of period |  |  | $ 0

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