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Fair Value Measurements - Fair Value Option (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | $ (1) | $ (4) | $ 1 | $ (5) |
Changes in fair value of assets using fair value option | 0 | 1 | 0 | 0 |
Fixed maturities, at fair value using the fair value option | 36 |  | 36 |  | $ 41
Assets, Fair Value Disclosure | 40,544 |  | 40,544 |  | 40,297
Total fixed maturities, FVO |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Assets, Fair Value Disclosure | 36 |  | 36 |  | 41
Corporate |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Changes in fair value of assets using fair value option | 0 | 0 | 0 | (1) |
Total fixed maturities, FVO |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Changes in fair value of assets using fair value option | 0 | 1 | 0 | 0 |
RMBS |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Changes in fair value of assets using fair value option | 0 | 1 | 0 | 1 |
Fixed maturities, at fair value using the fair value option | 36 |  | 36 |  | 41
Significant Unobservable Inputs (Level 3) |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Fixed maturities, at fair value using the fair value option | 0 |  | 0 |  | 0
Assets, Fair Value Disclosure | 2,019 |  | 2,019 |  | $ 2,029
Significant Unobservable Inputs (Level 3) | Total fixed maturities, FVO | Available-for-sale Securities [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  |  |  | (1) |
Significant Unobservable Inputs (Level 3) | Total fixed maturities, FVO | Available-for-sale Securities [Member] | CMBS |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | $ 0 | $ 0 | $ 0 | $ (1) |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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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://www.xbrl.org/2003/role/presentationRef -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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