v3.8.0.1

Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Transfers Between Level 1 and Level 2) (Details) - Separate account assets - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Assets Level1 To Level2 Transfers | $ 111 | $ 86
Fair Value Assets Level2 to Level1 Transfers | $ 207 | $ 40

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- Definition Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1 + References No definition available. + Details
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- Definition Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1 + References No definition available. + Details
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X
- 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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- Details
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