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Schedule H, Line 4i - Schedule of Assets (Held at End of Year) (Details) - The Magna Group of Companies Retirement Savings Plans
$ in Thousands
12 Months Ended
Dec. 31, 2025
USD ($)
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
Entity tax identification number 98-0095901
Plan number 002
Investment party in interest true
Participant Loans $ 64,470
Total Investments 2,855,733
Pooled Separate Accounts  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
Investments, current value 237,548
Common/Collective Trusts  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
Investments, current value 1,979,988
Mutual funds  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
Investments, current value $ 149,507
Investment, Identifier [Axis]: Fidelity MID CP Index Fund, Mutual Funds  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
EBP, Investment, Issuer Name [Extensible Enumeration] mga:FidelityInvestmentsMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual funds
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 89,149
Investment, Identifier [Axis]: Fidelity US Bond Index Fund, Mutual Funds  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
EBP, Investment, Issuer Name [Extensible Enumeration] mga:FidelityInvestmentsMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual funds
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 42,772
Investment, Identifier [Axis]: JPMCB Large Cap Growth CF-A, Common/Collective Trusts  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
EBP, Investment, Issuer Name [Extensible Enumeration] mga:JpmorganChaseBankN.a.Member
EBP, Investment, Current Value, Type [Extensible Enumeration] Common/Collective Trusts
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 187,666
Investment, Identifier [Axis]: Magna International Inc., Magna Stock  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
Investment party in interest true
EBP, Investment, Issuer Name [Extensible Enumeration] mga:MagnaInternationalInc.Member
EBP, Investment, Current Value, Type [Extensible Enumeration] EBP, Employer, Common Stock [Member]
Investments, cost $ 253,401
Investments, current value $ 274,071
Investment, Identifier [Axis]: Magna Mass Mutual GTD ACCUM CNT, Fully Benefit Responsive Investment Contracts  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
EBP, Investment, Issuer Name [Extensible Enumeration] mga:MassMutualMember
EBP, Investment, Current Value, Type [Extensible Enumeration] mga:EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractsMember
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 3,293
Investment, Identifier [Axis]: Northwestern Mutual Life Insurance Co, Life Insurance Policies  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
EBP, Investment, Issuer Name [Extensible Enumeration] mga:NorthwesternMutualLifeInsuranceCoMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Employee Benefit Plan, Life Insurance Policies [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 34
Investment, Identifier [Axis]: Prin Core Plus Bond Sep Acct-Z, Pooled Separate Accounts  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
Investment party in interest true
EBP, Investment, Issuer Name [Extensible Enumeration] mga:PrincipalLifeInsuranceCompanyMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Pooled Separate Accounts
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 57,160
Investment, Identifier [Axis]: Prin Div Intl SA-I5, Pooled Separate Accounts  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
Investment party in interest true
EBP, Investment, Issuer Name [Extensible Enumeration] mga:PrincipalLifeInsuranceCompanyMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Pooled Separate Accounts
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 83,578
Investment, Identifier [Axis]: Prin Equity Income SA-Z, Pooled Separate Accounts  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
Investment party in interest true
EBP, Investment, Issuer Name [Extensible Enumeration] mga:PrincipalLifeInsuranceCompanyMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Pooled Separate Accounts
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 72,646
Investment, Identifier [Axis]: Prin LifeTime Hyb 2015 CIT Q, Common/Collective Trusts  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
Investment party in interest true
EBP, Investment, Issuer Name [Extensible Enumeration] mga:PrincipalGlobalInvestorsTrustCoMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Common/Collective Trusts
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 3,863
Investment, Identifier [Axis]: Prin LifeTime Hyb 2020 CIT Q, Common/Collective Trusts  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
Investment party in interest true
EBP, Investment, Issuer Name [Extensible Enumeration] mga:PrincipalGlobalInvestorsTrustCoMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Common/Collective Trusts
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 100,968
Investment, Identifier [Axis]: Prin LifeTime Hyb 2025 CIT Q, Common/Collective Trusts  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
Investment party in interest true
EBP, Investment, Issuer Name [Extensible Enumeration] mga:PrincipalGlobalInvestorsTrustCoMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Common/Collective Trusts
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 51,023
Investment, Identifier [Axis]: Prin LifeTime Hyb 2030 CIT Q, Common/Collective Trusts  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
Investment party in interest true
EBP, Investment, Issuer Name [Extensible Enumeration] mga:PrincipalGlobalInvestorsTrustCoMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Common/Collective Trusts
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 309,814
Investment, Identifier [Axis]: Prin LifeTime Hyb 2035 CIT Q, Common/Collective Trusts  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
Investment party in interest true
EBP, Investment, Issuer Name [Extensible Enumeration] mga:PrincipalGlobalInvestorsTrustCoMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Common/Collective Trusts
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 82,518
Investment, Identifier [Axis]: Prin LifeTime Hyb 2040 CIT Q, Common/Collective Trusts  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
Investment party in interest true
EBP, Investment, Issuer Name [Extensible Enumeration] mga:PrincipalGlobalInvestorsTrustCoMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Common/Collective Trusts
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 280,604
Investment, Identifier [Axis]: Prin LifeTime Hyb 2045 CIT Q, Common/Collective Trusts  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
Investment party in interest true
EBP, Investment, Issuer Name [Extensible Enumeration] mga:PrincipalGlobalInvestorsTrustCoMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Common/Collective Trusts
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 83,546
Investment, Identifier [Axis]: Prin LifeTime Hyb 2050 CIT Q, Common/Collective Trusts  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
Investment party in interest true
EBP, Investment, Issuer Name [Extensible Enumeration] mga:PrincipalGlobalInvestorsTrustCoMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Common/Collective Trusts
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 228,033
Investment, Identifier [Axis]: Prin LifeTime Hyb 2055 CIT Q, Common/Collective Trusts  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
Investment party in interest true
EBP, Investment, Issuer Name [Extensible Enumeration] mga:PrincipalGlobalInvestorsTrustCoMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Common/Collective Trusts
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 74,222
Investment, Identifier [Axis]: Prin LifeTime Hyb 2060 CIT Q, Common/Collective Trusts  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
Investment party in interest true
EBP, Investment, Issuer Name [Extensible Enumeration] mga:PrincipalGlobalInvestorsTrustCoMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Common/Collective Trusts
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 60,323
Investment, Identifier [Axis]: Prin LifeTime Hyb 2065 CIT Q, Common/Collective Trusts  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
Investment party in interest true
EBP, Investment, Issuer Name [Extensible Enumeration] mga:PrincipalGlobalInvestorsTrustCoMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Common/Collective Trusts
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 9,485
Investment, Identifier [Axis]: Prin LifeTime Hyb 2070 CIT Q, Common/Collective Trusts  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
Investment party in interest true
EBP, Investment, Issuer Name [Extensible Enumeration] mga:PrincipalGlobalInvestorsTrustCoMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Common/Collective Trusts
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 4,262
Investment, Identifier [Axis]: Prin LifeTime Hyb Inc CIT Q, Common/Collective Trusts  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
Investment party in interest true
EBP, Investment, Issuer Name [Extensible Enumeration] mga:PrincipalGlobalInvestorsTrustCoMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Common/Collective Trusts
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 18,258
Investment, Identifier [Axis]: Prin U.S. Property SA-I5, Pooled Separate Accounts  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
Investment party in interest true
EBP, Investment, Issuer Name [Extensible Enumeration] mga:PrincipalLifeInsuranceCompanyMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Pooled Separate Accounts
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 24,164
Investment, Identifier [Axis]: Principal Global Investors Trust Co, Principal Stable Value, Stable Value Funds  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
Investment party in interest true
EBP, Investment, Issuer Name [Extensible Enumeration] mga:PrincipalGlobalInvestorsTrustCoMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Employee Benefit Plan, Stable Value Fund [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 143,649
Investment, Identifier [Axis]: Principal Life Insurance Company, Principal Pension Builder, Deferred Income Annuities  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
Investment party in interest true
EBP, Investment, Issuer Name [Extensible Enumeration] mga:PrincipalLifeInsuranceCompanyMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Employee Benefit Plan, Deferred Income Annuities [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 3,173
Investment, Identifier [Axis]: SPARTAN 500 INDEX POOL D, Common/Collective Trusts  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
EBP, Investment, Issuer Name [Extensible Enumeration] mga:GeodeCapitalMgmtTrustCoLlcMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Common/Collective Trusts
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 360,801
Investment, Identifier [Axis]: SPARTAN SMALL CAP IND POOL D, Common/Collective Trusts  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
EBP, Investment, Issuer Name [Extensible Enumeration] mga:GeodeCapitalMgmtTrustCoLlcMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Common/Collective Trusts
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 96,565
Investment, Identifier [Axis]: SPARTAN TOTAL INTL IND CL D, Common/Collective Trusts  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
EBP, Investment, Issuer Name [Extensible Enumeration] mga:GeodeCapitalMgmtTrustCoLlcMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Common/Collective Trusts
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 28,037
Investment, Identifier [Axis]: Vanguard Emerging Mkt Stk Index Fund, Mutual Funds  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
EBP, Investment, Issuer Name [Extensible Enumeration] mga:VanguardGroupMember
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual funds
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investments, current value $ 17,586
Maximum  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
Interest on loans (as a percent) 10.50%
Minimum  
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)  
Interest on loans (as a percent) 4.25%