Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities Schedule of Interest Rate Caps (Details)

v3.10.0.1
Derivative Instruments and Hedging Activities Schedule of Interest Rate Caps (Details) - USD ($)
 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Derivative [Line Items]            
Notional $ 41,330,283,000 $ 28,618,861,000 $ 31,226,878,000 $ 24,113,321,000 $ 16,988,116,000 $ 18,802,500,000
Interest Rate Cap [Member] | Long [Member]            
Derivative [Line Items]            
Notional $ 2,500,000,000          
Derivative, Average Cap Interest Rate 1.28%          
Weighted Average Variable Interest Rate 2.356%          
Weighted Average Remaining Maturity 1 year 3 months 14 days          
Derivative Maturity Over One And Within Two Years From Balance Sheet Date [Member] | Interest Rate Cap [Member] | Long [Member]            
Derivative [Line Items]            
Notional $ 800,000,000          
Derivative, Average Cap Interest Rate 1.344%          
Weighted Average Variable Interest Rate 2.339%          
Weighted Average Remaining Maturity 23 days          
Derivative Maturity Over Two And Within Three Years From Balance Sheet Date [Member] | Interest Rate Cap [Member] | Long [Member]            
Derivative [Line Items]            
Notional $ 1,700,000,000          
Derivative, Average Cap Interest Rate 1.25%          
Weighted Average Variable Interest Rate 2.364%          
Weighted Average Remaining Maturity 1 year 6 months 14 days