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DAC, VOBA, DSI, and DFEL (DSI) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Changes in DSI [Roll Forward] |  |  |
Balance as of beginning-of-year | $ 243 | $ 256 | $ 240
Deferrals | 29 | 24 | 29
Amortization, net of interest: |  |  |
Amortization, excluding unlocking, net of interest | (30) | (32) | (33)
Unlocking | (4) | (2) | 2
Adjustment related to realized (gains) losses | (1) | (1) | (1)
Adjustment related to unrealized (gains) losses | 1 | (2) | 19
Balance as of end-of-year | $ 238 | $ 243 | $ 256

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- References No definition available. + Details
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- Definition Amount of amortization of deferred sales inducement costs attributable to realized investment gains (losses). + References No definition available. + Details
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- Definition Amount of amortization of deferred sales inducement costs attributable to unrealized investment gains (losses). + References No definition available. + Details
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- Definition The amount of adjustment to amortization of deferred sales inducement costs arising from a revision in estimated gross profit (when such amount serves as the basis for allocating amortization of DSI to reporting periods). + References No definition available. + Details
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- Definition The amount of other amortization of deferred sales inducement costs, net of interest, during the period. + References No definition available. + Details
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- Definition Amount of addition in deferred sales inducement cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6481800&loc=d3e11332-158416 + Details
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- Definition Amount, after accumulated amortization, of deferred sales inducement cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6481800&loc=d3e11332-158416 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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