Shares and Stockholders' Equity (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015
Shares and Stockholders' Equity [Abstract]
Net Income Adjustment For Deferred Units of LNC Stock	$ 1

Some participants in LNC's deferred compensation plans have selected LNC stock as the measure for the investment return attributable to deferred amounts. In the event that the effect of settling this obligation in LNC stock is more dilutive than settling it in cash, the EPS calculation is adjusted by adding these shares to the denominator. This amount is the change in the numerator for mark to market adjustments included in net income attributable to these deferred units of LNC stock.

No definition available.

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Namespace Prefix:	lnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration