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Fair Value Measurements - Fair Value Option (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value Inputs and Valuation Techniques |  |  |
Fixed maturities, at fair value using the fair value option | $ 11 | $ 22 |
Changes in fair value of assets using fair value option | 0 |  |
Corporate |  |  |
Fair Value Inputs and Valuation Techniques |  |  |
Changes in fair value of assets using fair value option |  |  | $ (1)
Equity Securities [Member] |  |  |
Fair Value Inputs and Valuation Techniques |  |  |
Changes in fair value of assets using fair value option |  |  | $ 1
Real Estate Sector [Member] |  |  |
Fair Value Inputs and Valuation Techniques |  |  |
Fixed maturities, at fair value using the fair value option | $ 11 | 22 |
Changes in fair value of assets using fair value option |  | $ (1) |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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=75031198&loc=d3e14172-108612 + Details
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