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v2.4.1.9

Debt Notes (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |
Repayments of Notes Payable | $ 1,250,000,000 us-gaap_RepaymentsOfNotesPayable | $ 400,000,000 us-gaap_RepaymentsOfNotesPayable | $ 975,991,000 us-gaap_RepaymentsOfNotesPayable
Proceeds from Issuance of Unsecured Debt |  | 500,000,000 us-gaap_ProceedsFromIssuanceOfUnsecuredDebt |
Bridge Loan Principal Amount |  |  | 2,500,000,000 eqr_BridgeLoanPrincipalAmount
Debt Instrument, Fee Amount |  |  | 10,900,000 us-gaap_DebtInstrumentFeeAmount
Write-off of unamortized deferred financing costs |  | 7,400,000 eqr_UnamortizedDeferredFinancingCostsWrittenOff |
Summary of Company's unsecured note balances and certain interest rate and maturity date information |  |  |
Notes, net | 5,425,346,000 us-gaap_NotesPayable | 5,477,088,000 us-gaap_NotesPayable |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum | 0.03%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum | 0.03%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum | 7.25%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum | 7.25%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum |
5.250% Notes [Member] [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of Notes Payable | 500,000,000 us-gaap_RepaymentsOfNotesPayable / us-gaap_LongtermDebtTypeAxis = eqr_A5.250NotesMemberMember |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = eqr_A5.250NotesMemberMember |  |
5.200% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of Notes Payable |  | 400,000,000 us-gaap_RepaymentsOfNotesPayable / us-gaap_LongtermDebtTypeAxis = eqr_A5200NotesMember |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.20%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = eqr_A5200NotesMember |
DelayedDrawTermLoan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Term Loan Principal Amount |  | 750,000,000 eqr_TermLoanPrincipalAmount / us-gaap_LongtermDebtTypeAxis = eqr_DelayeddrawtermloanMember |
Repayments of Notes Payable | 750,000,000 us-gaap_RepaymentsOfNotesPayable / us-gaap_LongtermDebtTypeAxis = eqr_DelayeddrawtermloanMember |  |
Write-off of unamortized deferred financing costs | 600,000 eqr_UnamortizedDeferredFinancingCostsWrittenOff / us-gaap_LongtermDebtTypeAxis = eqr_DelayeddrawtermloanMember |  |
2.375% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Term Loan Principal Amount | 450,000,000 eqr_TermLoanPrincipalAmount / us-gaap_LongtermDebtTypeAxis = eqr_A2.375NotesMember |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = eqr_A2.375NotesMember |  |
Proceeds from Issuance of Unsecured Debt | 450,000,000 us-gaap_ProceedsFromIssuanceOfUnsecuredDebt / us-gaap_LongtermDebtTypeAxis = eqr_A2.375NotesMember |  |
Term Loan Facility Spread | 0.61%eqr_TermLoanFacilitySpread / us-gaap_LongtermDebtTypeAxis = eqr_A2.375NotesMember |  |
Proceeds from Debt, Net of Issuance Costs | 449,600,000 us-gaap_ProceedsFromDebtNetOfIssuanceCosts / us-gaap_LongtermDebtTypeAxis = eqr_A2.375NotesMember |  |
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum | 2.52%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMaximum / us-gaap_LongtermDebtTypeAxis = eqr_A2.375NotesMember |  |
3.00% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = eqr_A300NotesMember |
Proceeds from Issuance of Unsecured Debt |  | 500,000,000 us-gaap_ProceedsFromIssuanceOfUnsecuredDebt / us-gaap_LongtermDebtTypeAxis = eqr_A300NotesMember |
Proceeds from Debt, Net of Issuance Costs |  | 495,600,000 us-gaap_ProceedsFromDebtNetOfIssuanceCosts / us-gaap_LongtermDebtTypeAxis = eqr_A300NotesMember |
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum |  | 3.998%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMaximum / us-gaap_LongtermDebtTypeAxis = eqr_A300NotesMember |
4.50% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = eqr_A4.50NotesMember |  |
Proceeds from Issuance of Unsecured Debt | 750,000,000 us-gaap_ProceedsFromIssuanceOfUnsecuredDebt / us-gaap_LongtermDebtTypeAxis = eqr_A4.50NotesMember |  |
Proceeds from Debt, Net of Issuance Costs | 744,700,000 us-gaap_ProceedsFromDebtNetOfIssuanceCosts / us-gaap_LongtermDebtTypeAxis = eqr_A4.50NotesMember |  |
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum | 4.57%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMaximum / us-gaap_LongtermDebtTypeAxis = eqr_A4.50NotesMember |  |
Fixed Rate Public or Private Notes [Member] |  |  |
Summary of Company's unsecured note balances and certain interest rate and maturity date information |  |  |
Notes, net | 4,974,154,000 us-gaap_NotesPayable / us-gaap_LongtermDebtTypeAxis = eqr_FixedRatePublicOrPrivateNotesMember | 4,727,088,000 us-gaap_NotesPayable / us-gaap_LongtermDebtTypeAxis = eqr_FixedRatePublicOrPrivateNotesMember |
Weighted Average Interest Rate | 5.45%eqr_WeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = eqr_FixedRatePublicOrPrivateNotesMember | 5.55%eqr_WeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = eqr_FixedRatePublicOrPrivateNotesMember |
Floating Rate Public or Private Notes [Member] |  |  |
Summary of Company's unsecured note balances and certain interest rate and maturity date information |  |  |
Notes, net | 451,192,000 us-gaap_NotesPayable / us-gaap_LongtermDebtTypeAxis = eqr_FloatingRatePublicOrPrivateNotesMember | 750,000,000 us-gaap_NotesPayable / us-gaap_LongtermDebtTypeAxis = eqr_FloatingRatePublicOrPrivateNotesMember |
Weighted Average Interest Rate | 1.15%eqr_WeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = eqr_FloatingRatePublicOrPrivateNotesMember | 1.58%eqr_WeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = eqr_FloatingRatePublicOrPrivateNotesMember |
Bridge Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Write-off of unamortized deferred financing costs |  | 2,500,000 eqr_UnamortizedDeferredFinancingCostsWrittenOff / us-gaap_LongtermDebtTypeAxis = us-gaap_BridgeLoanMember |
Floating Rate Public or Private Notes [Member] |  |  |
Summary of Company's unsecured note balances and certain interest rate and maturity date information |  |  |
Debt Instrument, Maturity Date Range, Start | Jan. 01, 2019 | Jan. 01, 2015 |
Debt Instrument, Maturity Date Range, End | Dec. 31, 2019 | Dec. 31, 2015 |
Fixed Rate Public or Private Notes [Member] |  |  |
Summary of Company's unsecured note balances and certain interest rate and maturity date information |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum | 3.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_DebtInstrumentAxis = eqr_FixedRatePublicOrPrivateNotesMember | 3.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_DebtInstrumentAxis = eqr_FixedRatePublicOrPrivateNotesMember |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum | 7.57%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_DebtInstrumentAxis = eqr_FixedRatePublicOrPrivateNotesMember | 7.57%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_DebtInstrumentAxis = eqr_FixedRatePublicOrPrivateNotesMember |
Debt Instrument, Maturity Date Range, Start | Jan. 01, 2015 | Jan. 01, 2014 |
Debt Instrument, Maturity Date Range, End | Dec. 31, 2044 | Dec. 31, 2026 |
London Interbank Offered Rate (LIBOR) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Description of Variable Rate Basis |  | LIBOR plus 1.75% |
London Interbank Offered Rate (LIBOR) [Member] | 2.375% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Description of Variable Rate Basis | LIBOR plus .61% |  |
Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Description of Variable Rate Basis |  | LIBOR plus 1.20% |
Bridge Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Fee Amount |  |  | $ 8,400,000 us-gaap_DebtInstrumentFeeAmount / us-gaap_DebtSecurityAxis = us-gaap_BridgeLoanMember

X
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- Definition Represents a spread that is dependent upon a credit rating or bids received from lenders and is blended with an interest rate for amounts borrowed under the term loan. + References No definition available. + Details
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- Definition Write-off of amounts previously capitalized as debt issuance costs as part of an extinguishment of debt. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Amount of the fee that accompanies borrowing money under the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Minimum contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 + Details
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