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Fair Value Measurements - Fair Value Option (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Changes in fair value of assets using fair value option | $ 0 | $ 4 | $ (4)
Fixed maturities, at fair value using the fair value option | 41 | 211 |
ABS |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fixed maturities, at fair value using the fair value option | 0 | 7 |
CDOs |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fixed maturities, at fair value using the fair value option | 0 | 3 |
CMBS |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fixed maturities, at fair value using the fair value option | 0 | 8 |
Corporate |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Changes in fair value of assets using fair value option | (1) | 0 | (4)
Fixed maturities, at fair value using the fair value option | 0 | 40 |
Foreign government |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Changes in fair value of assets using fair value option | 0 | (1) | 0
U.S. government |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fixed maturities, at fair value using the fair value option | 0 | 7 |
RMBS |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Changes in fair value of assets using fair value option | 0 | 5 | 0
Fixed maturities, at fair value using the fair value option | 41 | 146 |
Equity securities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Changes in fair value of assets using fair value option | 1 | 0 | 0
Total fixed maturities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Changes in fair value of assets using fair value option | $ (1) | $ 4 | $ (4)

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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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