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Debt and Credit Facilities Additional Information (Details) - USD ($)
$ in Millions
1 Months Ended
Apr. 30, 2019
Mar. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Term Loan Facilities        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity     $ 2,500  
Amount outstanding     $ 0 $ 0
Senior Unsecured Note Issued September 2017 [Member] | Unsecured Debt        
Debt Instrument [Line Items]        
Repayments of Unsecured Debt   $ 750    
Senior Unsecured Note Issued September 2014 [Member] | Unsecured Debt        
Debt Instrument [Line Items]        
Repayments of Unsecured Debt $ 500