v3.26.1
Derivative Instruments - Effects of Qualifying and Non-Qualifying Hedges (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Derivative Instruments, Gain (Loss) [Line Items]        
Realized gain (loss) $ (406) $ (641) $ 60 $ (631)
Net investment income 1,625 1,471 3,230 2,934
Interest and debt expense 82 (13) 164 67
Location, Statement of Income, Balance [Axis]: us-gaap:DebtAndEquitySecuritiesRealizedGainLoss | Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Interest rate contracts, amount of gain or (loss) reclassified from AOCI into income 0 0 0 0
Foreign currency contracts, amount of gain or (loss) reclassified from AOCI into income 0 0 1 3
Location, Statement of Income, Balance [Axis]: us-gaap:DebtAndEquitySecuritiesRealizedGainLoss | Interest rate contracts | Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Hedged items 0 0 0 0
Derivatives designated as hedging instruments 0 0 0 0
Location, Statement of Income, Balance [Axis]: us-gaap:DebtAndEquitySecuritiesRealizedGainLoss | Interest rate contracts | Non-Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Non-Qualifying Hedges (44) (96) (18) (13)
Location, Statement of Income, Balance [Axis]: us-gaap:DebtAndEquitySecuritiesRealizedGainLoss | Foreign currency contracts | Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Hedged items 0 0 0 0
Derivatives designated as hedging instruments 0 0 0 0
Location, Statement of Income, Balance [Axis]: us-gaap:DebtAndEquitySecuritiesRealizedGainLoss | Foreign currency contracts | Non-Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Non-Qualifying Hedges 0 (3) 2 (5)
Location, Statement of Income, Balance [Axis]: us-gaap:DebtAndEquitySecuritiesRealizedGainLoss | Equity market contracts | Non-Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Non-Qualifying Hedges 3,801 1,185 2,805 41
Location, Statement of Income, Balance [Axis]: us-gaap:DebtAndEquitySecuritiesRealizedGainLoss | Credit contracts | Non-Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Non-Qualifying Hedges (1) 1 (1) 2
Location, Statement of Income, Balance [Axis]: us-gaap:DebtAndEquitySecuritiesRealizedGainLoss | Reinsurance-related | Non-Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Non-Qualifying Hedges (90) (2) 107 (110)
Location, Statement of Income, Balance [Axis]: us-gaap:DebtAndEquitySecuritiesRealizedGainLoss | RILA, fixed indexed annuity and IUL contracts | Non-Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Non-Qualifying Hedges (3,450) (2,073) (1,866) (419)
Location, Statement of Income, Balance [Axis]: us-gaap:NetInvestmentIncome | Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Interest rate contracts, amount of gain or (loss) reclassified from AOCI into income 0 1 0 1
Foreign currency contracts, amount of gain or (loss) reclassified from AOCI into income 15 12 31 27
Location, Statement of Income, Balance [Axis]: us-gaap:NetInvestmentIncome | Interest rate contracts | Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Hedged items (4) 3 (5) 14
Derivatives designated as hedging instruments 4 (3) 5 (14)
Location, Statement of Income, Balance [Axis]: us-gaap:NetInvestmentIncome | Interest rate contracts | Non-Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Non-Qualifying Hedges 0 0 0 0
Location, Statement of Income, Balance [Axis]: us-gaap:NetInvestmentIncome | Foreign currency contracts | Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Hedged items 0 2 (1) 3
Derivatives designated as hedging instruments 0 (2) 1 (3)
Location, Statement of Income, Balance [Axis]: us-gaap:NetInvestmentIncome | Foreign currency contracts | Non-Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Non-Qualifying Hedges 0 0 0 0
Location, Statement of Income, Balance [Axis]: us-gaap:NetInvestmentIncome | Equity market contracts | Non-Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Non-Qualifying Hedges 0 0 0 0
Location, Statement of Income, Balance [Axis]: us-gaap:NetInvestmentIncome | Credit contracts | Non-Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Non-Qualifying Hedges 0 0 0 0
Location, Statement of Income, Balance [Axis]: us-gaap:NetInvestmentIncome | Reinsurance-related | Non-Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Non-Qualifying Hedges 0 0 0 0
Location, Statement of Income, Balance [Axis]: us-gaap:NetInvestmentIncome | RILA, fixed indexed annuity and IUL contracts | Non-Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Non-Qualifying Hedges 0 0 0 0
Location, Statement of Income, Balance [Axis]: lnc:InterestExpenseDebtIncludingGainLossOnExtinguishmentOfDebt | Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Interest rate contracts, amount of gain or (loss) reclassified from AOCI into income 2 4 4 8
Foreign currency contracts, amount of gain or (loss) reclassified from AOCI into income 0 0 0 0
Location, Statement of Income, Balance [Axis]: lnc:InterestExpenseDebtIncludingGainLossOnExtinguishmentOfDebt | Interest rate contracts | Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Hedged items 0 (1) (2) (17)
Derivatives designated as hedging instruments 0 1 2 17
Location, Statement of Income, Balance [Axis]: lnc:InterestExpenseDebtIncludingGainLossOnExtinguishmentOfDebt | Interest rate contracts | Non-Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Non-Qualifying Hedges 0 0 0 0
Location, Statement of Income, Balance [Axis]: lnc:InterestExpenseDebtIncludingGainLossOnExtinguishmentOfDebt | Foreign currency contracts | Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Hedged items 0 0 0 0
Derivatives designated as hedging instruments 0 0 0 0
Location, Statement of Income, Balance [Axis]: lnc:InterestExpenseDebtIncludingGainLossOnExtinguishmentOfDebt | Foreign currency contracts | Non-Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Non-Qualifying Hedges 0 0 0 0
Location, Statement of Income, Balance [Axis]: lnc:InterestExpenseDebtIncludingGainLossOnExtinguishmentOfDebt | Equity market contracts | Non-Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Non-Qualifying Hedges 0 0 0 0
Location, Statement of Income, Balance [Axis]: lnc:InterestExpenseDebtIncludingGainLossOnExtinguishmentOfDebt | Credit contracts | Non-Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Non-Qualifying Hedges 0 0 0 0
Location, Statement of Income, Balance [Axis]: lnc:InterestExpenseDebtIncludingGainLossOnExtinguishmentOfDebt | Reinsurance-related | Non-Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Non-Qualifying Hedges 0 0 0 0
Location, Statement of Income, Balance [Axis]: lnc:InterestExpenseDebtIncludingGainLossOnExtinguishmentOfDebt | RILA, fixed indexed annuity and IUL contracts | Non-Qualifying Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Non-Qualifying Hedges $ 0 $ 0 $ 0 $ 0