Schedule of Assets (Held at End of Year) (Details) - SIMON PROPERTY GROUP AND ADOPTING ENTITIES MATCHING SAVINGS PLAN
|
12 Months Ended |
|
Dec. 31, 2025
USD ($)
shares
|
|---|
| Schedule H, Line 4i - Schedule of Assets (Held at End of Year) |
|
| Entity tax identification number |
34-1755769
|
| Plan number |
002
|
| Participant loans |
$ 5,421,872
|
| Total |
$ 674,361,626
|
| Investment, Identifier [Axis]: Invesco Stable Value B1, Common/Collective Trust Funds |
|
| Schedule H, Line 4i - Schedule of Assets (Held at End of Year) |
|
| Investment issuer name |
spg:InvescoStableValueB1Member
|
| Investment type |
Common/collective trust funds
|
| Number of shares | shares |
25,464,422
|
| Current Value |
$ 25,464,422
|
| Investment participation status |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Investment, Identifier [Axis]: Mercer Diversified Bond, Common/Collective Trust Funds |
|
| Schedule H, Line 4i - Schedule of Assets (Held at End of Year) |
|
| Investment issuer name |
spg:MercerDiversifiedBondMember
|
| Investment type |
Common/collective trust funds
|
| Number of shares | shares |
1,003,721
|
| Current Value |
$ 13,008,228
|
| Investment party in interest |
true
|
| Investment participation status |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Investment, Identifier [Axis]: Mercer International Stock, Common/Collective Trust Funds |
|
| Schedule H, Line 4i - Schedule of Assets (Held at End of Year) |
|
| Investment issuer name |
spg:MercerInternationalStockMember
|
| Investment type |
Common/collective trust funds
|
| Number of shares | shares |
1,406,587
|
| Current Value |
$ 30,480,736
|
| Investment party in interest |
true
|
| Investment participation status |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Investment, Identifier [Axis]: Mercer Small Mid Cap Stock Fund, Common/Collective Trust Funds |
|
| Schedule H, Line 4i - Schedule of Assets (Held at End of Year) |
|
| Investment issuer name |
spg:MercerSmallMidCapStockFundMember
|
| Investment type |
Common/collective trust funds
|
| Number of shares | shares |
1,613,133
|
| Current Value |
$ 35,472,797
|
| Investment party in interest |
true
|
| Investment participation status |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Investment, Identifier [Axis]: Simon Property Group, Inc. Corporate, Common Stock |
|
| Schedule H, Line 4i - Schedule of Assets (Held at End of Year) |
|
| Investment issuer name |
spg:SimonPropertyGroupInc.CorporateCommonStockMember
|
| Investment type |
us-gaap:CommonStockMember
|
| Number of shares | shares |
190,619
|
| Current Value |
$ 35,292,847
|
| Investment party in interest |
true
|
| Investment participation status |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Investment, Identifier [Axis]: State Street Real Asset, Common/Collective Trust Funds |
|
| Schedule H, Line 4i - Schedule of Assets (Held at End of Year) |
|
| Investment issuer name |
spg:StateStreetRealAssetMember
|
| Investment type |
Common/collective trust funds
|
| Number of shares | shares |
596,278
|
| Current Value |
$ 8,120,116
|
| Investment participation status |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Investment, Identifier [Axis]: State Street S&P 500 Index X, Common Collective Trust Funds |
|
| Schedule H, Line 4i - Schedule of Assets (Held at End of Year) |
|
| Investment issuer name |
spg:StateStreetSP500IndexXMember
|
| Investment type |
Common/collective trust funds
|
| Number of shares | shares |
18,178,651
|
| Current Value |
$ 219,416,316
|
| Investment participation status |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Investment, Identifier [Axis]: State Street Small Mid Cap Index, Common/Collective Trust Funds |
|
| Schedule H, Line 4i - Schedule of Assets (Held at End of Year) |
|
| Investment issuer name |
spg:StateStreetSmallMidCapIndexMember
|
| Investment type |
Common/collective trust funds
|
| Number of shares | shares |
766,555
|
| Current Value |
$ 15,910,608
|
| Investment participation status |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Investment, Identifier [Axis]: State Street Target Return 2025 IV, Common/Collective Trust Funds |
|
| Schedule H, Line 4i - Schedule of Assets (Held at End of Year) |
|
| Investment issuer name |
spg:StateStreetTargetReturn2025IvMember
|
| Investment type |
Common/collective trust funds
|
| Number of shares | shares |
1,777,699
|
| Current Value |
$ 32,343,460
|
| Investment participation status |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Investment, Identifier [Axis]: State Street Target Return 2030 IV, Common/Collective Trust Funds |
|
| Schedule H, Line 4i - Schedule of Assets (Held at End of Year) |
|
| Investment issuer name |
spg:StateStreetTargetReturn2030IvMember
|
| Investment type |
Common/collective trust funds
|
| Number of shares | shares |
1,951,782
|
| Current Value |
$ 38,387,658
|
| Investment participation status |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Investment, Identifier [Axis]: State Street Target Return 2035 IV, Common/Collective Trust Funds |
|
| Schedule H, Line 4i - Schedule of Assets (Held at End of Year) |
|
| Investment issuer name |
spg:StateStreetTargetReturn2035IvMember
|
| Investment type |
Common/collective trust funds
|
| Number of shares | shares |
2,355,811
|
| Current Value |
$ 48,562,679
|
| Investment participation status |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Investment, Identifier [Axis]: State Street Target Return 2040 IV, Common/Collective Trust Funds |
|
| Schedule H, Line 4i - Schedule of Assets (Held at End of Year) |
|
| Investment issuer name |
spg:StateStreetTargetReturn2040IvMember
|
| Investment type |
Common/collective trust funds
|
| Number of shares | shares |
2,042,462
|
| Current Value |
$ 43,810,811
|
| Investment participation status |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Investment, Identifier [Axis]: State Street Target Return 2045 IV, Common/Collective Trust Funds |
|
| Schedule H, Line 4i - Schedule of Assets (Held at End of Year) |
|
| Investment issuer name |
spg:StateStreetTargetReturn2045IvMember
|
| Investment type |
Common/collective trust funds
|
| Number of shares | shares |
1,436,314
|
| Current Value |
$ 31,854,563
|
| Investment participation status |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Investment, Identifier [Axis]: State Street Target Return 2050 IV, Common/Collective Trust Funds |
|
| Schedule H, Line 4i - Schedule of Assets (Held at End of Year) |
|
| Investment issuer name |
spg:StateStreetTargetReturn2050IvMember
|
| Investment type |
Common/collective trust funds
|
| Number of shares | shares |
1,063,050
|
| Current Value |
$ 24,137,618
|
| Investment participation status |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Investment, Identifier [Axis]: State Street Target Return 2055 IV, Common/Collective Trust Funds |
|
| Schedule H, Line 4i - Schedule of Assets (Held at End of Year) |
|
| Investment issuer name |
spg:StateStreetTargetReturn2055IvMember
|
| Investment type |
Common/collective trust funds
|
| Number of shares | shares |
766,213
|
| Current Value |
$ 17,473,483
|
| Investment participation status |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Investment, Identifier [Axis]: State Street Target Return 2060 IV, Common/Collective Trust Funds |
|
| Schedule H, Line 4i - Schedule of Assets (Held at End of Year) |
|
| Investment issuer name |
spg:StateStreetTargetReturn2060IvMember
|
| Investment type |
Common/collective trust funds
|
| Number of shares | shares |
392,082
|
| Current Value |
$ 8,941,428
|
| Investment participation status |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Investment, Identifier [Axis]: State Street Target Return 2065 IV, Common/Collective Trust Funds |
|
| Schedule H, Line 4i - Schedule of Assets (Held at End of Year) |
|
| Investment issuer name |
spg:StateStreetTargetReturn2065IvMember
|
| Investment type |
Common/collective trust funds
|
| Number of shares | shares |
171,539
|
| Current Value |
$ 3,049,614
|
| Investment participation status |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Investment, Identifier [Axis]: State Street Target Return 2070 IV, Common Collective Trust Funds |
|
| Schedule H, Line 4i - Schedule of Assets (Held at End of Year) |
|
| Investment issuer name |
spg:StateStreetTargetReturn2070IvMember
|
| Investment type |
Common/collective trust funds
|
| Number of shares | shares |
37,818
|
| Current Value |
$ 458,999
|
| Investment participation status |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Investment, Identifier [Axis]: State Street Target Return Income IV, Common/Collective Trust Funds |
|
| Schedule H, Line 4i - Schedule of Assets (Held at End of Year) |
|
| Investment issuer name |
spg:StateStreetTargetReturnIncomeIvMember
|
| Investment type |
Common/collective trust funds
|
| Number of shares | shares |
1,211,254
|
| Current Value |
$ 19,043,343
|
| Investment participation status |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Investment, Identifier [Axis]: State Street Target Return Income, Common/Collective Trust Funds |
|
| Schedule H, Line 4i - Schedule of Assets (Held at End of Year) |
|
| Investment issuer name |
spg:StateStreetTargetReturnIncomeMember
|
| Investment type |
Common/collective trust funds
|
| Number of shares | shares |
23,117
|
| Current Value |
$ 353,963
|
| Investment participation status |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Investment, Identifier [Axis]: State Street US Bond Index X, Common Collective Trust Funds |
|
| Schedule H, Line 4i - Schedule of Assets (Held at End of Year) |
|
| Investment issuer name |
spg:StateStreetUsBondIndexXMember
|
| Investment type |
Common/collective trust funds
|
| Number of shares | shares |
1,111,742
|
| Current Value |
$ 11,691,080
|
| Investment participation status |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Investment, Identifier [Axis]: State Street US Index X, Common Collective Trust Funds |
|
| Schedule H, Line 4i - Schedule of Assets (Held at End of Year) |
|
| Investment issuer name |
spg:StateStreetUsIndexXMember
|
| Investment type |
Common/collective trust funds
|
| Number of shares | shares |
449,638
|
| Current Value |
$ 5,664,985
|
| Investment participation status |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Common/collective trust funds |
|
| Schedule H, Line 4i - Schedule of Assets (Held at End of Year) |
|
| Current Value |
$ 633,646,907
|
| Maximum |
|
| Schedule H, Line 4i - Schedule of Assets (Held at End of Year) |
|
| Participant loans, interest rate |
10.75%
|
| Minimum |
|
| Schedule H, Line 4i - Schedule of Assets (Held at End of Year) |
|
| Participant loans, interest rate |
4.00%
|