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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income tax expense (benefit) | $ (1) | $ (11) | $ (1) | $ (13)
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, after Tax | 1 | 0 | 1 | (1)
Net of tax and noncontrolling interest | 5 | (29) | 7 | (25)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (4) | 1 | (5) | (3)
Unrealized Gains (Losses) on Available-for-Sale Securities [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net realized investment gains | (7) | 2 | (8) | (1)
Net of tax and noncontrolling interest | (5) | 1 | (6) | (2)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (5) | 1 | (6) | (2)
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 | (1) | 0 | 1 | 1
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 1 | 0 | 1 | (1)
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, before Tax, after Reclassification Adjustment | 1 | 0 | 1 | (1)
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net of tax and noncontrolling interest | (4) | 1 | (5) | (3)
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 | 0 | (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
Total before tax | 0 | 0 | 0 | (1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | $ 0 | $ 0 | $ 0 | $ (1)

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