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Debt and Credit Facilities Additional Information (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Apr. 30, 2019
Mar. 31, 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  
Subsequent Event | Senior Unsecured Note Issued September 2014 [Member] | Unsecured Debt      
Debt Instrument [Line Items]      
Repayments of Unsecured Debt $ 500