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Stock-Based Incentive Compensation Plans (Details)
 3 Months Ended
Mar. 31, 2015
Stock options [Member]  
Share-based compensation arrangement by share-based payment award [Line Items]  
Shares granted 495,519us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Performance Shares [Member]  
Share-based compensation arrangement by share-based payment award [Line Items]  
Shares granted 159,097us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Restricted Stock Units [Member]  
Share-based compensation arrangement by share-based payment award [Line Items]  
Shares granted 422,570us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= lnc_RestrictedStockUnitsMember
Non-employee Stock Appreciation Rights [Member]  
Share-based compensation arrangement by share-based payment award [Line Items]  
Shares granted 48,451us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= lnc_StockAppreciationRightsMember
Non-employee Agent Stock Options [Member]  
Share-based compensation arrangement by share-based payment award [Line Items]  
Shares granted 89,831us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= lnc_NonEmployeeAgentStockOptionsMember
Non-employee Director Deferred Stock Units [Member]  
Share-based compensation arrangement by share-based payment award [Line Items]  
Shares granted 7,883us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= lnc_NonEmployeeDirectorDeferredStockUnitsMember