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Borrowing Arrangements (Derivatives) (Details) (USD $)
Dec. 31, 2014
Derivative [Line Items]  
Variable Rate Debt Amount $ 2,400,000,000us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
Fixed Rate Debt Amount 8,500,000,000us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
Swap | Variable Rate Debt [Member]  
Derivative [Line Items]  
Derivative Notional Amount 153,600,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_LongtermDebtTypeAxis
= vtr_VariableRateDebtMember
Swap | Fixed Rate Debt [Member]  
Derivative [Line Items]  
Derivative Notional Amount $ 59,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_LongtermDebtTypeAxis
= vtr_FixedRateDebtMember