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Notes Payable, Unsecured Notes and Credit Facility (Details 2) (USD $) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2015 extension | Dec. 31, 2014 | Mar. 31, 2014
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |
Number of operating apartment communities | 254 us-gaap_NumberOfRealEstateProperties |  |  |  |
Variable rate unsecured credit facility | $ 0 us-gaap_LineOfCredit |  | $ 0 us-gaap_LineOfCredit |  |
Mortgage notes payable |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |
Amount drawn | 1,046,799,000 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |  | 1,047,461,000 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |  |
Fixed rate notes | 2,396,479,000 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember | [1] | 2,400,677,000 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember | [1] |
Mortgage notes payable held by wholly owned subsidiaries guaranteed by the Company | 257,763,000 us-gaap_GuarantyLiabilities / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |  |  |  |
Variable Rate Unsecured Term Loan [Member] |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |
Amount drawn | 300,000,000 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_LongtermDebtTypeAxis = avb_VariableRateUnsecuredTermLoanMember |  | 250,000,000 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_LongtermDebtTypeAxis = avb_VariableRateUnsecuredTermLoanMember |  |
Unsecured notes |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |
Fixed rate notes | 2,750,000,000 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | [2] | 2,750,000,000 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | [2] |
Term Loan |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |
Principal amount of notes issued |  |  |  |  | 300,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = avb_VariableRateUnsecuredTermLoanMember
Additional amount with option to draw | 50,000,000 us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount / us-gaap_DebtInstrumentAxis = avb_VariableRateUnsecuredTermLoanMember |  |  |  |
Variable rate unsecured credit facility |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |
Available borrowing capacity | 1,300,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |  |
Line of credit facility, extension period | 1 year |  |  |  |
Number of extension options | 2 avb_LineOfCreditFacilityNumberOfExtensions / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |  |
Extension period under each option | 6 months |  |  |  |
Extension fee | 1,950,000 avb_LineOfCreditFacilityExtensionFee / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |  |
Period of borrowing rate assumed | 1 month |  |  |  |
Annual facility fee | 1,950,000 us-gaap_LineOfCreditFacilityCommitmentFeeAmount / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |  |
Variable rate unsecured credit facility | 0 us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  | 0 us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |
Outstanding balance of letters of credit | 45,069,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  | 49,407,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |
Net carrying value of apartment communities and improved land parcels securing debt | $ 4,331,683,000 us-gaap_PledgedAssetsNotSeparatelyReportedRealEstate / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |  |
Fixed rate mortgage notes payable |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |
Weighted average interest rate, debt (as a percent) | 4.50%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = avb_FixedRateMortgageNotesPayableMember |  | 4.50%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = avb_FixedRateMortgageNotesPayableMember |  |
Variable rate mortgage notes payable, unsecured term loan and Credit Facility |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |
Weighted average interest rate, debt (as a percent) | 1.80%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = avb_VariableRateMortgageNotesPayableUnsecuredTermLoanAndCreditFacilityMember |  | 1.80%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = avb_VariableRateMortgageNotesPayableUnsecuredTermLoanAndCreditFacilityMember |  |
LIBOR | Term Loan | Unsecured notes |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |
Debt instrument variable rate | LIBOR |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) | 1.45%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = avb_VariableRateUnsecuredTermLoanMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
LIBOR | Secured Mortgage |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |
Debt instrument variable rate | LIBOR |  |  |  |
LIBOR | Variable rate unsecured credit facility |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) | 1.05%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Current interest rate (as a percent) | 1.23%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
[1] | Balances at March 31, 2015 and December 31, 2014 exclude $75,544 and $84,449 of debt premium, respectively, as reflected in mortgage notes payable on the Company’s Condensed Consolidated Balance Sheets.
[2] | Balances at March 31, 2015 and December 31, 2014 exclude $6,491 and $6,735 of debt discount, respectively, as reflected in unsecured notes, net on the Company’s Condensed Consolidated Balance Sheets.

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- Definition Represents the number of potential extension options of the Credit Facility. + References No definition available. + Details
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- Definition Represents the potential extension period of the Credit Facility. + References No definition available. + Details
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- Definition Represents the potential extension period under each extension option of the Credit Facility. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + 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 Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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 Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Subparagraph b -Article 5 + Details
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- Definition This item represents a non-contingent liability for the fair value of an obligation to stand ready to perform over the term of a guaranty issued in the event that specified triggering events or conditions occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=7661617&loc=d3e11049-110243 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7661617&loc=d3e11019-110243 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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