Quarterly report pursuant to Section 13 or 15(d)

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

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Derivative Instruments and Hedging Activities Schedule of Interest Rate Swap Receivers (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Jun. 30, 2018
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Derivative [Line Items]            
Notional $ 41,330,283,000 $ 31,226,878,000 $ 28,618,861,000 $ 24,113,321,000 $ 16,988,116,000 $ 18,802,500,000
Interest Rate Swap [Member] | Short [Member]            
Derivative [Line Items]            
Notional $ 7,102,438,000 $ 5,561,990,000        
Weighted Average Variable Interest Rate 2.335% 1.462%        
Weighted Average Fixed Interest Rate 2.694% 2.211%        
Weighted Average Remaining Maturity 5 years 5 months 1 day 7 years 7 months 28 days        
Interest Rate Swap [Member] | Derivative Maturity Over Two And Within Three Years From Balance Sheet Date [Member] | Short [Member]            
Derivative [Line Items]            
Notional $ 250,000,000 $ 200,000,000        
Weighted Average Variable Interest Rate 2.347% 1.391%        
Weighted Average Fixed Interest Rate 2.258% 1.642%        
Weighted Average Remaining Maturity 1 year 3 months 21 days 2 years 7 months 6 days        
Interest Rate Swap [Member] | Derivative Maturity Over Three And Within Four Years From Balance Sheet Date [Member] | Short [Member]            
Derivative [Line Items]            
Notional $ 2,477,438,000 $ 500,000,000        
Weighted Average Variable Interest Rate 2.338% 1.357%        
Weighted Average Fixed Interest Rate 2.736% 1.327%        
Weighted Average Remaining Maturity 2 years 5 months 26 days 3 years 18 days        
Interest Rate Swap [Member] | Derivative Maturity Over Four Years From Balance Sheet Date [Member] | Short [Member]            
Derivative [Line Items]            
Notional $ 4,375,000,000 $ 4,861,990,000        
Weighted Average Variable Interest Rate 2.333% 1.475%        
Weighted Average Fixed Interest Rate 2.696% 2.325%        
Weighted Average Remaining Maturity 7 years 3 months 25 days 8 years 4 months 2 days