Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.3
Derivative Instruments and Hedging Activities Schedule of Interest Rate Caps (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Derivative [Line Items]            
Notional $ 36,528,169,000 $ 54,226,205,000 $ 55,549,424,000 $ 41,330,283,000 $ 28,618,861,000 $ 31,226,878,000
Interest Rate Cap [Member]            
Derivative [Line Items]            
Notional 2,500,000,000         $ 0
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 2.656%          
Weighted Average Remaining Maturity 1 year 14 days          
Derivative Maturity Within One Year 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 2.422%          
Weighted Average Remaining Maturity 16 days          
Derivative Maturity Over One And Within Two 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 2.766%          
Weighted Average Remaining Maturity 1 year 3 months 14 days