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Fair Value Measurements - Fair Value Option (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Fair Value Disclosures [Abstract] |  |  |  |  |
Fixed maturities, at fair value using the fair value option | $ 75 |  | $ 75 |  | $ 0
Changes in fair value of assets using fair value option | $ (1) | $ 0 | $ (1) | $ 0 |

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- Definition Fair Value, Option, Fixed Maturity Securities + References No definition available. + Details
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- References No definition available. + Details
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- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123596393&loc=d3e14172-108612 + Details
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