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Derivative Instruments and Hedging Activities Schedule of Interest Rate Caps (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2017
Derivative [Line Items]      
Notional $ 36,528,169,000 $ 49,205,497,000 $ 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