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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
--- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2023 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2023 | Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholder's equity at beginning of period | [1] |  |  |  |  |  |  |  |  |  | $ 8,548 |  |
Other comprehensive income (loss) before reclassifications |  |  |  |  |  | $ (145) | $ (802) |  |  |  | 120 | $ (1,829) |
Amounts reclassified from accumulated other comprehensive income (loss) net of tax |  |  |  |  |  | (28) | (19) |  |  |  | (53) | (26) |
Other comprehensive income (loss) after tax (expense) benefit |  |  |  |  |  | (117) | (783) |  |  |  | 173 | (1,803) |
Total stockholder's equity at end of period |  | $ 8,548 | [1] |  |  | 8,726 | 9,005 | [2] |  |  | 8,726 | 9,005 | [2]
Income tax effects allocated directly to equity, cumulative effect of change in accounting principle |  | 11 |  | $ (446) |  |  |  |  | $ (227) |  |  |  |
Reclassification from AOCI, tax |  |  |  |  |  | 8 | 3 |  |  |  | 14 | 6 |
Tax (expense) benefit on other comprehensive income (loss) |  |  |  |  |  | 42 | 189 |  |  |  | (33) | 451 |
Prior to Adoption |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholder's equity at beginning of period |  |  |  |  |  |  |  |  |  |  | 8,825 |  |
Total stockholder's equity at end of period |  | 8,825 |  |  |  |  |  |  |  |  |  |  |
Effect of Adoption |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholder's equity at beginning of period |  |  |  |  |  |  |  |  |  |  | (277) |  |
Total stockholder's equity at end of period |  | (277) |  |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholder's equity at beginning of period |  |  |  |  |  | (3,308) | (2,380) | [2] | (1,360) | [2] | (3,598) | (1,360) | [2]
Total stockholder's equity at end of period |  | (3,598) |  | (1,360) | [2] | (3,425) | (3,163) | [2] | (2,380) | [2] | (3,425) | (3,163) | [2]
Accumulated other comprehensive income (loss) | Prior to Adoption |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholder's equity at beginning of period |  |  |  |  |  | (3,308) | (1,303) | [2] | 320 | [2] | (3,557) | 320 | [2]
Total stockholder's equity at end of period |  | (3,557) |  | 320 | [2] |  |  |  | (1,303) | [2] |  |  |
Accumulated other comprehensive income (loss) | Effect of Adoption |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholder's equity at beginning of period |  |  |  |  |  | 0 | (1,077) | [2] | (1,680) | [2] | (41) | (1,680) | [2]
Total stockholder's equity at end of period |  | (41) |  | (1,680) | [2] |  |  |  | (1,077) | [2] |  |  |
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 |  |  |  |  |  | (15) | (6) |  | (2) |  | (7) | (2) |
Other comprehensive income (loss) before reclassifications |  |  |  |  |  | (8) | (1) |  |  |  | (16) | (5) |
Amounts reclassified from accumulated other comprehensive income (loss) net of tax |  |  |  |  |  | (7) | 1 |  |  |  | (7) | 1 |
Other comprehensive income (loss) after tax (expense) benefit |  |  |  |  |  | (1) | (2) |  |  |  | (9) | (6) |
Total stockholder's equity at end of period |  | (7) |  | (2) |  | (16) | (8) |  | (6) |  | (16) | (8) |
Income tax effects allocated directly to equity, cumulative effect of change in accounting principle |  | 0 |  | 0 |  |  |  |  | 0 |  |  |  |
Reclassification from AOCI, tax |  |  |  |  |  | 2 | (1) |  |  |  | 2 | (1) |
Tax (expense) benefit on other comprehensive income (loss) |  |  |  |  |  | 0 | 0 |  |  |  | 2 | 1 |
Net unrealized gains (losses) on investments | Net unrealized gains (losses) on investments with an allowance for credit losses | Prior to Adoption |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholder's equity at beginning of period |  |  |  |  |  |  | (6) |  | (2) |  | (7) | (2) |
Total stockholder's equity at end of period |  | (7) |  | (2) |  |  |  |  | (6) |  |  |  |
Net unrealized gains (losses) on investments | Net unrealized gains (losses) on investments with an allowance for credit losses | Effect of Adoption |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholder's equity at beginning of period |  |  |  |  |  |  | 0 |  | 0 |  | 0 | 0 |
Total stockholder's equity at end of period |  | 0 |  | 0 |  |  |  |  | 0 |  |  |  |
Net unrealized gains (losses) on investments | Net unrealized gains (losses) on other investments |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholder's equity at beginning of period |  |  |  |  |  | (2,068) | 716 |  | 3,359 |  | (2,738) | 3,359 |
Other comprehensive income (loss) before reclassifications |  |  |  |  |  | (427) | (2,240) |  |  |  | 225 | (4,884) |
Amounts reclassified from accumulated other comprehensive income (loss) net of tax |  |  |  |  |  | (14) | (14) |  |  |  | (32) | (15) |
Other comprehensive income (loss) after tax (expense) benefit |  |  |  |  |  | (413) | (2,226) |  |  |  | 257 | (4,869) |
Total stockholder's equity at end of period |  | (2,738) |  | 3,359 |  | (2,481) | (1,510) |  | 716 |  | (2,481) | (1,510) |
Income tax effects allocated directly to equity, cumulative effect of change in accounting principle |  | 0 |  | 617 |  |  |  |  | 270 |  |  |  |
Reclassification from AOCI, tax |  |  |  |  |  | 4 | 3 |  |  |  | 8 | 4 |
Tax (expense) benefit on other comprehensive income (loss) |  |  |  |  |  | 112 | 590 |  |  |  | (68) | 1,288 |
Net unrealized gains (losses) on investments | Net unrealized gains (losses) on other investments | Prior to Adoption |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholder's equity at beginning of period |  |  |  |  |  |  | (572) |  | 1,039 |  | (2,738) | 1,039 |
Total stockholder's equity at end of period |  | (2,738) |  | 1,039 |  |  |  |  | (572) |  |  |  |
Net unrealized gains (losses) on investments | Net unrealized gains (losses) on other investments | Effect of Adoption |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholder's equity at beginning of period |  |  |  |  |  |  | 1,288 |  | 2,320 |  | 0 | 2,320 |
Total stockholder's equity at end of period |  | 0 |  | 2,320 |  |  |  |  | 1,288 |  |  |  |
Pension and postretirement benefits |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholder's equity at beginning of period |  |  |  |  |  | (584) | (598) |  | (604) |  | (591) | (604) |
Other comprehensive income (loss) before reclassifications |  |  |  |  |  | 0 | 0 |  |  |  | 0 | 0 |
Amounts reclassified from accumulated other comprehensive income (loss) net of tax |  |  |  |  |  | (7) | (6) |  |  |  | (14) | (12) |
Other comprehensive income (loss) after tax (expense) benefit |  |  |  |  |  | 7 | 6 |  |  |  | 14 | 12 |
Total stockholder's equity at end of period |  | (591) |  | (604) |  | (577) | (592) |  | (598) |  | (577) | (592) |
Income tax effects allocated directly to equity, cumulative effect of change in accounting principle |  | 0 |  | 0 |  |  |  |  | 0 |  |  |  |
Reclassification from AOCI, tax |  |  |  |  |  | 2 | 1 |  |  |  | 4 | 3 |
Tax (expense) benefit on other comprehensive income (loss) |  |  |  |  |  | (2) | (1) |  |  |  | (4) | (3) |
Pension and postretirement benefits | Prior to Adoption |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholder's equity at beginning of period |  |  |  |  |  |  | (598) |  | (604) |  | (591) | (604) |
Total stockholder's equity at end of period |  | (591) |  | (604) |  |  |  |  | (598) |  |  |  |
Pension and postretirement benefits | Effect of Adoption |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholder's equity at beginning of period |  |  |  |  |  |  | 0 |  | 0 |  | 0 | 0 |
Total stockholder's equity at end of period |  | 0 |  | 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 |  |  |  |  |  | (437) | (2,365) |  | (4,000) |  | (41) | (4,000) |
Other comprehensive income (loss) before reclassifications |  |  |  |  |  | 256 | 1,507 |  |  |  | (140) | 3,142 |
Amounts reclassified from accumulated other comprehensive income (loss) net of tax |  |  |  |  |  | 0 | 0 |  |  |  | 0 | 0 |
Other comprehensive income (loss) after tax (expense) benefit |  |  |  |  |  | 256 | 1,507 |  |  |  | (140) | 3,142 |
Total stockholder's equity at end of period |  | (41) |  | (4,000) |  | (181) | (858) |  | (2,365) |  | (181) | (858) |
Income tax effects allocated directly to equity, cumulative effect of change in accounting principle |  | 11 |  | (1,063) |  |  |  |  | (497) |  |  |  |
Reclassification from AOCI, tax |  |  |  |  |  | 0 | 0 |  |  |  | 0 | 0 |
Tax (expense) benefit on other comprehensive income (loss) |  |  |  |  |  | (68) | (400) |  |  |  | 37 | (835) |
Cumulative impact of changes in discount rates used to measure long duration contracts | Prior to Adoption |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholder's equity at beginning of period |  |  |  |  |  |  | 0 |  | 0 |  | 0 | 0 |
Total stockholder's equity at end of period |  | 0 |  | 0 |  |  |  |  | 0 |  |  |  |
Cumulative impact of changes in discount rates used to measure long duration contracts | Effect of Adoption |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholder's equity at beginning of period |  |  |  |  |  |  | (2,365) |  | (4,000) |  | (41) | (4,000) |
Total stockholder's equity at end of period |  | (41) |  | (4,000) |  |  |  |  | (2,365) |  |  |  |
Cumulative foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholder's equity at beginning of period |  |  |  |  |  | (204) | (127) |  | (113) |  | (221) | (113) |
Other comprehensive income (loss) before reclassifications |  |  |  |  |  | 34 | (68) |  |  |  | 51 | (82) |
Amounts reclassified from accumulated other comprehensive income (loss) net of tax |  |  |  |  |  | 0 | 0 |  |  |  | 0 | 0 |
Other comprehensive income (loss) after tax (expense) benefit |  |  |  |  |  | 34 | (68) |  |  |  | 51 | (82) |
Total stockholder's equity at end of period |  | (221) |  | (113) |  | (170) | (195) |  | (127) |  | (170) | (195) |
Income tax effects allocated directly to equity, cumulative effect of change in accounting principle |  | 0 |  | 0 |  |  |  |  | 0 |  |  |  |
Reclassification from AOCI, tax |  |  |  |  |  | 0 | 0 |  |  |  | 0 | 0 |
Tax (expense) benefit on other comprehensive income (loss) |  |  |  |  |  | $ 0 | 0 |  |  |  | 0 | 0 |
Cumulative foreign currency translation adjustment | Prior to Adoption |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholder's equity at beginning of period |  |  |  |  |  |  | (127) |  | (113) |  | (221) | (113) |
Total stockholder's equity at end of period |  | (221) |  | (113) |  |  |  |  | (127) |  |  |  |
Cumulative foreign currency translation adjustment | Effect of Adoption |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Total stockholder's equity at beginning of period |  |  |  |  |  |  | $ 0 |  | 0 |  | $ 0 | $ 0 |
Total stockholder's equity at end of period |  | $ 0 |  | $ 0 |  |  |  |  | $ 0 |  |  |  |
[1] | As of January 1, 2023, the Company adopted ASU 2018-12 using the modified retrospective method applied as of the transition date of January 1, 2021. Prior period amounts in the financial statements have been adjusted to reflect application of the new guidance. See Note A to the Condensed Consolidated Financial Statements for additional information.
[2] | As of January 1, 2023, the Company adopted ASU 2018-12 using the modified retrospective method applied as of the transition date of January 1, 2021. Prior period amounts in the financial statements have been adjusted to reflect application of the new guidance. See Note A to the Condensed Consolidated Financial Statements for additional information.

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