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Debt and Credit Facilities - Additional Information (Details) - USD ($)
1 Months Ended
Feb. 29, 2020
Jun. 30, 2020
Dec. 31, 2019
Revolving Credit Facility | 2016 Revolving Credit Facility      
Debt Instrument [Line Items]      
Maximum borrowing capacity   $ 2,500,000,000  
Amounts outstanding under revolving credit facilities   0 $ 0
Revolving Credit Facility | 2020 Revolving Credit Facility      
Debt Instrument [Line Items]      
Maximum borrowing capacity   2,500,000,000  
Amounts outstanding under revolving credit facilities   $ 0 $ 0
Unsecured Debt | Senior Unsecured Note Issued November 2014      
Debt Instrument [Line Items]      
Repayments of senior unsecured notes $ 500,000,000