0000906107 eqr:ErpOperatingLimitedPartnershipMember 2026-07-31 2026-07-31 0000906107 eqr:SevenPointFiveSevenPercentNotesDueAugustFifteenTwoThousandTwentySixMember eqr:ErpOperatingLimitedPartnershipMember 2026-07-31 2026-07-31 0000906107 2026-07-31 2026-07-31 0000931182 0000906107 true 8-K false false 2026-07-31 EQUITY RESIDENTIAL MD 1-12252 13-3675988 ERP OPERATING LIMITED PARTNERSHIP IL 0-24920 36-3894853 Two North Riverside Plaza Chicago IL 60606 312 474-1300 Not applicable false false false false Common Shares of Beneficial Interest,$0.01 Par Value EQR NYSE 7.57% Notes due August 15, 2026 NYSE false false