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Derivative Instruments and Hedging Activities - Additional Information (Details)
$ in Millions
Sep. 30, 2015
USD ($)
Derivative
Rate
Designated as hedging instrument [member] | Term loan interest rate swaps [member]  
Derivative [Line Items]  
Derivative, notional amount $ 1,450
Derivative, swaption interest rate 1.87%
Number of interest rate derivatives held | Derivative 4
Not designated as hedging instrument [member] | CMBS loan interest rate cap [member]  
Derivative [Line Items]  
Derivative, notional amount $ 875
Derivative, cap interest rate 6.00%
Number of interest rate derivatives held | Derivative 1
Not designated as hedging instrument [member] | Interest rate cap [member]  
Derivative [Line Items]  
Derivative, notional amount $ 525
Derivative, cap interest rate | Rate 4.00%
Number of interest rate derivatives held | Derivative 1
Not designated as hedging instrument [member] | Foreign exchange forward contracts [member]  
Derivative [Line Items]  
Derivative, notional amount $ 92
Number of foreign exchange forward contracts held | Derivative 29
Not designated as hedging instrument [member] | Assumed mortgage loan interest rate cap [member]  
Derivative [Line Items]  
Derivative, notional amount $ 338
Derivative, cap interest rate 3.00%
Number of interest rate derivatives held | Derivative 1