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Derivative Instruments and Hedging Activities Schedule of Interest Rate Swap Payers (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Jun. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Derivative [Line Items]            
Notional $ 25,836,064,000 $ 48,445,497,000 $ 8,076,933,000 $ 54,226,205,000 $ 55,549,424,000 $ 36,528,169,000
Interest Rate Swap [Member] | Long [Member]            
Derivative [Line Items]            
Notional $ 11,194,818,000 $ 30,913,709,000        
Weighted Average Variable Interest Rate 0.09% 1.921%        
Weighted Average Remaining Maturity 2 years 8 months 19 days 3 years 1 month 20 days        
Weighted Average Fixed Interest Rate 0.067% 1.878%        
Interest Rate Swap [Member] | Derivative Maturity Within One Year From Balance Sheet Date [Member] | Long [Member]            
Derivative [Line Items]            
Notional   $ 3,640,000,000        
Weighted Average Variable Interest Rate   1.937%        
Weighted Average Remaining Maturity   9 months 29 days        
Weighted Average Fixed Interest Rate   1.806%        
Interest Rate Swap [Member] | Derivative Maturity Over One And Within Two Years From Balance Sheet Date [Member] | Long [Member]            
Derivative [Line Items]            
Notional   $ 15,740,977,000        
Weighted Average Variable Interest Rate   1.91%        
Weighted Average Remaining Maturity   1 year 5 months 19 days        
Weighted Average Fixed Interest Rate   1.681%        
Interest Rate Swap [Member] | Derivative Maturity Over Two And Within Three Years From Balance Sheet Date [Member] | Long [Member]            
Derivative [Line Items]            
Notional $ 7,415,818,000 $ 2,578,640,000        
Weighted Average Variable Interest Rate 0.09% 1.901%        
Weighted Average Remaining Maturity 1 year 10 months 28 days 2 years 8 months 26 days        
Weighted Average Fixed Interest Rate 0.042% 1.911%        
Interest Rate Swap [Member] | Derivative Maturity Over Three And Within Four Years From Balance Sheet Date [Member] | Long [Member]            
Derivative [Line Items]            
Notional $ 2,281,500,000 $ 215,000,000        
Weighted Average Variable Interest Rate 0.09% 1.91%        
Weighted Average Remaining Maturity 2 years 8 months 23 days 3 years 10 months 24 days        
Weighted Average Fixed Interest Rate 0.023% 3.057%        
Interest Rate Swap [Member] | Derivative Maturity Over Four Years From Balance Sheet Date [Member] | Long [Member]            
Derivative [Line Items]            
Notional $ 1,497,500,000 $ 8,739,092,000        
Weighted Average Variable Interest Rate 0.09% 1.935%        
Weighted Average Remaining Maturity 6 years 8 months 26 days 7 years 2 months 12 days        
Weighted Average Fixed Interest Rate 0.257% 2.224%