v3.26.1
Debt - Narrative (Details)
€ in Millions
1 Months Ended 6 Months Ended
Jun. 18, 2026
USD ($)
Mar. 05, 2026
USD ($)
Jan. 15, 2026
USD ($)
Oct. 08, 2025
USD ($)
Sep. 01, 2025
USD ($)
May 12, 2025
EUR (€)
Apr. 25, 2025
USD ($)
Mar. 20, 2025
EUR (€)
Mar. 13, 2025
EUR (€)
Jan. 29, 2025
EUR (€)
Aug. 10, 2026
USD ($)
Aug. 10, 2026
EUR (€)
Jun. 30, 2026
USD ($)
item
property
Jun. 30, 2026
EUR (€)
item
property
Jun. 30, 2025
USD ($)
Jun. 30, 2026
EUR (€)
property
item
Jun. 15, 2026
USD ($)
Jan. 13, 2026
USD ($)
Dec. 31, 2025
USD ($)
Oct. 31, 2025
USD ($)
Aug. 19, 2025
USD ($)
Jan. 30, 2025
property
Indebtedness                                            
Long-term debt                         $ 28,699,607,000           $ 28,430,175,000      
Amount of debt redeemed                         4,861,066,000   $ 1,088,689,000              
The Mall Firenze and The Mall Sanremo                                            
Indebtedness                                            
Number of luxury outlets acquired | property                                           2
Simon Property Group, L.P.                                            
Indebtedness                                            
Long-term debt                         28,699,607,000           28,430,175,000      
Amount of debt redeemed                         4,861,066,000   $ 1,088,689,000              
Exchangeable Debt | Simon Property Group, L.P.                                            
Indebtedness                                            
Long-term debt                         213,900,000     € 187.5            
Amount of debt converted                         641,600,000 € 547.1                
Amount of debt redeemed                         643,300,000 € 548.7                
Exchangeable Debt | Simon Property Group, L.P. | Subsequent Event                                            
Indebtedness                                            
Long-term debt | €                       € 101.2                    
Amount of debt converted | €                       86.3                    
Amount of debt redeemed | €                       € 115.7                    
Mortgages | TRG                                            
Indebtedness                                            
Amount of debt redeemed                     $ 375,000,000                      
Number of properties unencumbered from debt borrowing                     1                      
Mortgage debt assumed                                       $ 3,100,000,000    
Unsecured Debt | Credit Facilities | Simon Property Group, L.P.                                            
Indebtedness                                            
Available borrowing capacity                         7,700,000,000                  
Maximum amount outstanding during period                         460,000,000                  
Credit facility, weighted average amount outstanding                         429,500,000                  
Letters of credit outstanding                         3,100,000                  
Unsecured Debt | Unsecured Term Loan Maturing March 20, 2029 | Simon Property Group, L.P.                                            
Indebtedness                                            
Long-term debt                         399,300,000     € 350.0            
Debt issued | €               € 350.0                            
Interest rate on debt (as a percent)               2.60%                            
Unsecured Debt | Unsecured Term Loan Maturing June 18, 2031 | Simon Property Group, L.P.                                            
Indebtedness                                            
Credit facility, amount outstanding                         460,000,000                  
Debt issued $ 460,000,000                                          
Interest rate on debt (as a percent) 4.02%                                          
Unsecured Debt | Credit Facility | Simon Property Group, L.P.                                            
Indebtedness                                            
Maximum borrowing capacity   $ 5,000,000,000                     $ 5,000,000,000                  
Additional borrowing capacity   1,000,000,000                                        
Optional expanded maximum borrowing capacity   $ 6,000,000,000                                        
Debt extension period   1 year                                        
Credit facility, amount repaid | €               € 376.0 € 18.0                          
Amount drawn             $ 155,000,000     € 376.0                        
Amount of debt redeemed $ 460,000,000                                          
Unsecured Debt | Credit Facility | Simon Property Group, L.P. | Fed Funds Effective Rate                                            
Indebtedness                                            
Interest rate (as a percent)                         0.50% 0.50%                
Unsecured Debt | Credit Facility | Simon Property Group, L.P. | Adjusted Term One-Month SOFR                                            
Indebtedness                                            
Interest rate (as a percent)                         1.00% 1.00%                
Unsecured Debt | Credit Facility | Simon Property Group, L.P. | Secured Overnight Financing Rate (SOFR)                                            
Indebtedness                                            
Interest rate (as a percent)                         0.65% 0.65%                
Unsecured Debt | Credit Facility | Minimum | Simon Property Group, L.P.                                            
Indebtedness                                            
Facility fee (in percentage)                         0.10% 0.10%                
Unsecured Debt | Credit Facility | Minimum | Simon Property Group, L.P. | Base Rate                                            
Indebtedness                                            
Interest rate (as a percent)                         0.00% 0.00%                
Unsecured Debt | Credit Facility | Minimum | Simon Property Group, L.P. | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate                                            
Indebtedness                                            
Interest rate (as a percent)                         0.625% 0.625%                
Unsecured Debt | Credit Facility | Maximum | Simon Property Group, L.P.                                            
Indebtedness                                            
Facility fee (in percentage)                         0.30% 0.30%                
Unsecured Debt | Credit Facility | Maximum | Simon Property Group, L.P. | Base Rate                                            
Indebtedness                                            
Interest rate (as a percent)                         0.35% 0.35%                
Unsecured Debt | Credit Facility | Maximum | Simon Property Group, L.P. | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate                                            
Indebtedness                                            
Interest rate (as a percent)                         1.35% 1.35%                
Unsecured Debt | Supplemental Facility | Simon Property Group, L.P.                                            
Indebtedness                                            
Maximum borrowing capacity                         $ 3,500,000,000                  
Optional expanded maximum borrowing capacity                         $ 4,500,000,000                  
Credit facility, amount repaid       $ 500,000,000                                    
Amount drawn | €           € 500.0                                
Unsecured Debt | Supplemental Facility | Simon Property Group, L.P. | Fed Funds Effective Rate                                            
Indebtedness                                            
Interest rate (as a percent)                         0.50% 0.50%                
Unsecured Debt | Supplemental Facility | Simon Property Group, L.P. | Adjusted Term One-Month SOFR                                            
Indebtedness                                            
Interest rate (as a percent)                         1.00% 1.00%                
Unsecured Debt | Supplemental Facility | Simon Property Group, L.P. | Secured Overnight Financing Rate (SOFR)                                            
Indebtedness                                            
Interest rate (as a percent)                         0.65% 0.65%                
Unsecured Debt | Supplemental Facility | Minimum | Simon Property Group, L.P.                                            
Indebtedness                                            
Facility fee (in percentage)                         0.10% 0.10%                
Unsecured Debt | Supplemental Facility | Minimum | Simon Property Group, L.P. | Base Rate                                            
Indebtedness                                            
Interest rate (as a percent)                         0.00% 0.00%                
Unsecured Debt | Supplemental Facility | Minimum | Simon Property Group, L.P. | Secured Overnight Financing Rate (SOFR)                                            
Indebtedness                                            
Interest rate (as a percent)                         0.625% 0.625%                
Unsecured Debt | Supplemental Facility | Maximum | Simon Property Group, L.P.                                            
Indebtedness                                            
Facility fee (in percentage)                         0.30% 0.30%                
Unsecured Debt | Supplemental Facility | Maximum | Simon Property Group, L.P. | Base Rate                                            
Indebtedness                                            
Interest rate (as a percent)                         0.35% 0.35%                
Unsecured Debt | Supplemental Facility | Maximum | Simon Property Group, L.P. | Secured Overnight Financing Rate (SOFR)                                            
Indebtedness                                            
Interest rate (as a percent)                         1.35% 1.35%                
Unsecured Debt | Commercial Paper | Simon Property Group, L.P.                                            
Indebtedness                                            
Credit facility, amount outstanding                         $ 846,400,000                  
Maximum borrowing capacity                         2,000,000,000                  
Unsecured Debt | U.S Dollar Denominated Notes | Simon Property Group, L.P.                                            
Indebtedness                                            
Credit facility, amount outstanding                         $ 846,400,000                  
Weighted average interest rate (as a percent)                         3.96%     3.96%            
Unsecured Debt | Senior unsecured notes | Simon Property Group, L.P.                                            
Indebtedness                                            
Long-term debt                         $ 19,000,000,000                  
Unsecured Debt | Senior Unsecured Notes 3.30% due 2026 | Simon Property Group, L.P.                                            
Indebtedness                                            
Interest rate on debt (as a percent)     3.30%                                      
Amount of debt redeemed     $ 800,000,000                                      
Unsecured Debt | Senior Unsecured Notes 4.375 due 2030 | Simon Property Group, L.P.                                            
Indebtedness                                            
Debt issued                                         $ 700,000,000  
Interest rate on debt (as a percent)                                         4.375%  
Unsecured Debt | Senior Unsecured Notes 5.125 due 2035 | Simon Property Group, L.P.                                            
Indebtedness                                            
Debt issued                                         $ 800,000,000  
Interest rate on debt (as a percent)                                         5.125%  
Unsecured Debt | Senior Unsecured Notes 3.50 due 2035 | Simon Property Group, L.P.                                            
Indebtedness                                            
Interest rate on debt (as a percent)         3.50%                                  
Amount of debt redeemed         $ 1,100,000,000                                  
Unsecured Debt | Senior Unsecured Notes 1.25% due 2025 | Simon Property Group, L.P.                                            
Indebtedness                                            
Amount of debt redeemed | €           € 500.0                                
Unsecured Debt | Senior Unsecured Notes Maturing January 2031 | Simon Property Group, L.P.                                            
Indebtedness                                            
Debt issued                                   $ 800,000,000        
Interest rate on debt (as a percent)                                   4.30%        
Unsecured Debt | Senior Unsecured Notes Maturing June 15, 2031 | Simon Property Group, L.P.                                            
Indebtedness                                            
Debt issued                                 $ 500,000,000          
Interest rate on debt (as a percent)                                 3.65%          
Secured Debt | Mortgages                                            
Indebtedness                                            
Long-term debt                         $ 8,100,000,000           $ 8,200,000,000      
Debt covenants                                            
Number of non-recourse mortgage notes under which the Company and subsidiaries are borrowers | item                         41 41                
Number of properties pledged as collateral | property                         44 44                
Number of cross-defaulted and cross-collateralized mortgage pools | item                         2     2            
Total number of properties pledged as collateral for cross defaulted and cross collateralized mortgages | property                         5     5