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Comprehensive Income - Schedule of Amounts Reclassed Out of Each Component of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income tax expense (benefit) | $ (3) | $ (1) | $ (10) | $ (7)
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, after Tax | 0 | 0 | 0 | 0
Net of tax and noncontrolling interest | (30) | 66 | (11) | 19
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | (1) | (10) | 4
Realized Investment Gains (Losses) | (1) | 1 | 3 | (7)
Unrealized Gains (Losses) on Available-for-Sale Securities [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net of tax and noncontrolling interest | 0 | 0 | (5) | 6
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 0 | (5) | 6
Realized Investment Gains (Losses) | 1 | (1) | (3) | 7
Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, after Tax | 0 | 0 | 0 | 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 0 | 0 | 0
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, before Tax, after Reclassification Adjustment | 0 | 0 | 0 | 0
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net of tax and noncontrolling interest | 0 | (1) | (9) | 4
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Available-for-Sale Securities [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income tax expense (benefit) | 2 | 0 | 2 | 1
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income tax expense (benefit) |  |  | 0 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Financial Liability, Fair Value Option, Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income tax expense (benefit) | 0 | 0 |  | 0
Other Postretirement Benefits Plan [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 0 | (5) | (1)
Other Postretirement Benefits Plan [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income tax expense (benefit) | 0 | 0 | 0 | 0
Prior service cost | 0 | 0 | 0 | (1)
Actuarial gains (losses) | 0 | 0 | 0 | 0
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax | 0 |  | 5 |
Total before tax | 0 | 0 | (5) | (1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | $ 0 | $ 0 | $ (5) | $ (1)

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