Significant Accounting Policies - Reclassification Out Of AOCI, Simon Property Group, L.P. (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Summary of Significant Accounting Policies | |||||
| Total accumulated other comprehensive income (loss) | $ (286,000) | $ (286,000) | $ (278,300) | ||
| Interest expense | (281,164) | $ (232,724) | (556,826) | $ (459,720) | |
| Simon Property Group, L.P | |||||
| Summary of Significant Accounting Policies | |||||
| Total accumulated other comprehensive income (loss) | (335,300) | (335,300) | $ (326,000) | ||
| Interest expense | (281,164) | (232,724) | (556,826) | (459,720) | |
| Accumulated derivative gains (losses), net | Simon Property Group, L.P | Amount reclassified from accumulated other comprehensive income (loss) | |||||
| Summary of Significant Accounting Policies | |||||
| Interest expense | $ 1,706 | $ 1,455 | $ 3,412 | $ 2,910 | |