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Fair Value of Financial Instruments (Changes In Unrealized Gains (Losses) Within Level 3 Financial Instruments Carried At Fair Value And Still Held) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Changes in unrealized gains (losses) within Level 3 financial instruments carried at fair value and still held    
Change in unrealized gains (losses) included in net income $ (274)us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss [1] $ (301)us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss [1]
Derivative Investments [Member] | Realized Gain (Loss) [Member]    
Changes in unrealized gains (losses) within Level 3 financial instruments carried at fair value and still held    
Change in unrealized gains (losses) included in net income (95)us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_FinancialInstrumentAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_IncomeStatementLocationAxis
= lnc_RealizedGainLossMember		 [1] (110)us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_FinancialInstrumentAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
/ us-gaap_IncomeStatementLocationAxis
= lnc_RealizedGainLossMember		 [1]
Indexed Annuity and IUL Contracts [Member] | Realized Gain (Loss) [Member]    
Changes in unrealized gains (losses) within Level 3 financial instruments carried at fair value and still held    
Change in unrealized gains (losses) included in net income (26)us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_FinancialInstrumentAxis
= lnc_IndexedAnnuityContractsMember
/ us-gaap_IncomeStatementLocationAxis
= lnc_RealizedGainLossMember		 [1] (24)us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_FinancialInstrumentAxis
= lnc_IndexedAnnuityContractsMember
/ us-gaap_IncomeStatementLocationAxis
= lnc_RealizedGainLossMember		 [1]
GLB Embedded Derivative Reserves [Member] | Realized Gain (Loss) [Member]    
Changes in unrealized gains (losses) within Level 3 financial instruments carried at fair value and still held    
Change in unrealized gains (losses) included in net income (161)us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_FinancialInstrumentAxis
= lnc_GuaranteedLivingBenefitsEmbeddedDerivativeReservesMember
/ us-gaap_IncomeStatementLocationAxis
= lnc_RealizedGainLossMember		 [1] (172)us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_FinancialInstrumentAxis
= lnc_GuaranteedLivingBenefitsEmbeddedDerivativeReservesMember
/ us-gaap_IncomeStatementLocationAxis
= lnc_RealizedGainLossMember		 [1]
VIE's Liabilities - Derivative Instruments [Member] | Net Investment Income [Member]    
Changes in unrealized gains (losses) within Level 3 financial instruments carried at fair value and still held    
Change in unrealized gains (losses) included in net income $ 8us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_FinancialInstrumentAxis
= lnc_VariableInterestEntitiesLiabilitiesMember
/ us-gaap_IncomeStatementLocationAxis
= lnc_NetInvestmentIncomeMember		 [2] $ 5us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_FinancialInstrumentAxis
= lnc_VariableInterestEntitiesLiabilitiesMember
/ us-gaap_IncomeStatementLocationAxis
= lnc_NetInvestmentIncomeMember		 [2]
[1] Included in realized gain (loss) on our Consolidated Statements of Comprehensive Income (Loss).
[2] Included in net investment income on our Consolidated Statements of Comprehensive Income (Loss).