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Pension, Postretirement Health Care and Life Insurance Benefit Plans (Pension plans' asset target allocations) (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Health care cost trend rate [Abstract]    
Fixed Maturity Securities Allocation US Plan Employees 50.00%lnc_FixedMaturitySecuritiesAllocationUsPlanEmployees 50.00%lnc_FixedMaturitySecuritiesAllocationUsPlanEmployees
Fixed Maturity Securities Allocation US Plan Agents 100.00%lnc_FixedMaturitySecuritiesAllocationUsPlanAgents 100.00%lnc_FixedMaturitySecuritiesAllocationUsPlanAgents
Fixed Maturity Securities Allocation Non US Plan 40.00%lnc_FixedMaturitySecuritiesAllocationNonUsPlan 39.00%lnc_FixedMaturitySecuritiesAllocationNonUsPlan
Domestic Equity Allocation U S Plan Employees 35.00%lnc_DomesticEquityAllocationUSPlanEmployees 35.00%lnc_DomesticEquityAllocationUSPlanEmployees
Domestic Equity Allocation U S Plan Agents 0.00%lnc_DomesticEquityAllocationUSPlanAgents 0.00%lnc_DomesticEquityAllocationUSPlanAgents
Domestic Equity Allocation Non US Plan 0.00%lnc_DomesticEquityAllocationNonUsPlan 0.00%lnc_DomesticEquityAllocationNonUsPlan
International Equity Allocation US Plan Employees 15.00%lnc_InternationalEquityAllocationUsPlanEmployees 15.00%lnc_InternationalEquityAllocationUsPlanEmployees
International Equity Allocation US Plan Agents 0.00%lnc_InternationalEquityAllocationUsPlanAgents 0.00%lnc_InternationalEquityAllocationUsPlanAgents
International Equity Allocation Non US Plan 0.00%lnc_InternationalEquityAllocationNonUsPlan 0.00%lnc_InternationalEquityAllocationNonUsPlan
Equity Securities Allocation US Plan Employees 0.00%lnc_EquitySecuritiesAllocationUsPlanEmployees 0.00%lnc_EquitySecuritiesAllocationUsPlanEmployees
Equity Securities Allocation US Plan Agents 0.00%lnc_EquitySecuritiesAllocationUsPlanAgents 0.00%lnc_EquitySecuritiesAllocationUsPlanAgents
Equity Securities Allocation Non US Plan 55.00%lnc_EquitySecuritiesAllocationNonUsPlan 58.00%lnc_EquitySecuritiesAllocationNonUsPlan
Cash and Invested Cash Allocation US Plan Employees 0.00%lnc_CashAndInvestedCashAllocationUsPlanEmployees 0.00%lnc_CashAndInvestedCashAllocationUsPlanEmployees
Cash and Invested Cash Allocation US Plan Agents 0.00%lnc_CashAndInvestedCashAllocationUsPlanAgents 0.00%lnc_CashAndInvestedCashAllocationUsPlanAgents
Cash and Invested Cash Allocation Non US Plan 5.00%lnc_CashAndInvestedCashAllocationNonUsPlan 3.00%lnc_CashAndInvestedCashAllocationNonUsPlan