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Derivative Instruments and Hedging Activities Schedule of Interest Rate Swap Receivers (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Derivative [Line Items]            
Notional $ 60,549,307,000 $ 8,076,933,000 $ 48,445,497,000 $ 55,549,424,000 $ 58,777,783,000 $ 36,528,169,000
Interest Rate Swap [Member] | Short [Member]            
Derivative [Line Items]            
Notional   $ 700,000,000 $ 8,788,761,000      
Weighted Average Variable Interest Rate   0.08% 1.933%      
Weighted Average Fixed Interest Rate   0.419% 2.262%      
Weighted Average Remaining Maturity 7 years 7 months 9 days 9 years 9 months 3 days        
Interest Rate Swap [Member] | Derivative Maturity Within One Year From Balance Sheet Date [Member] | Short [Member]            
Derivative [Line Items]            
Notional     $ 250,000,000      
Weighted Average Variable Interest Rate     1.953%      
Weighted Average Fixed Interest Rate     2.258%      
Weighted Average Remaining Maturity 21 days          
Interest Rate Swap [Member] | Derivative Maturity Over One And Within Two Years From Balance Sheet Date [Member] | Short [Member]            
Derivative [Line Items]            
Notional     $ 915,000,000      
Weighted Average Variable Interest Rate     1.894%      
Weighted Average Fixed Interest Rate     2.516%      
Weighted Average Remaining Maturity 1 year 1 month 6 days          
Interest Rate Swap [Member] | Derivative Maturity Over Two And Within Three Years From Balance Sheet Date [Member] | Short [Member]            
Derivative [Line Items]            
Notional     $ 0      
Weighted Average Variable Interest Rate     0.00%      
Weighted Average Fixed Interest Rate     0.00%      
Weighted Average Remaining Maturity 0 years          
Interest Rate Swap [Member] | Derivative Maturity Over Three And Within Four Years From Balance Sheet Date [Member] | Short [Member]            
Derivative [Line Items]            
Notional     $ 0      
Weighted Average Variable Interest Rate     0.00%      
Weighted Average Fixed Interest Rate     0.00%      
Weighted Average Remaining Maturity 0 years          
Interest Rate Swap [Member] | Derivative Maturity Over Four Years From Balance Sheet Date [Member] | Short [Member]            
Derivative [Line Items]            
Notional   $ 700,000,000 $ 7,623,761,000      
Weighted Average Variable Interest Rate   0.08% 1.937%      
Weighted Average Fixed Interest Rate   0.419% 2.232%      
Weighted Average Remaining Maturity 8 years 7 months 20 days 9 years 9 months 3 days