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Shares and Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2015
Deferred compensation plan mark to market adjustment | $ (7) | $ 4
Common stock warrant [Member] |  |
Outstanding warrant to purchase common stock (in shares) | 598,935 |
Exercise price of warrant (in dollars per share) | $ 9.91 |
Warrant expiration date LNC deferred compensation plans | Jul. 10, 2019 |

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- Definition Mark to market adjustments of the entity's stock associated with non-employee directors' deferred compensation plans. + References No definition available. + Details
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- Definition The expiration date for outstanding warrants held by participants in LNC's deferred compensation plans + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Details
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