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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income tax expense (benefit) | $ (2) | $ 0 | $ (15) | $ 5
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, after Tax | 0 | 0 | (1) | 2
Net of tax and noncontrolling interest | 17 | (108) | (9) | (423)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (3) | (3) | (6) | (18)
Unrealized Gains (Losses) on Available-for-Sale Securities [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net realized investment gains | (3) | (2) | (4) | (20)
Net of tax and noncontrolling interest | (3) | (2) | (4) | (19)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (3) | (2) | (4) | (19)
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 | (1) | (2)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 0 | (1) | 2
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, before Tax, after Reclassification Adjustment | 0 | 0 | (1) | 2
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net of tax and noncontrolling interest | (3) | (3) | (5) | (18)
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) | (1) | 0 | 0 | (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 | (1) | (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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