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Long-term Debt	6 Months Ended
Long-term Debt	Jun. 30, 2020
Debt Disclosure [Abstract]
Long-term Debt	Long-term Debt In May 2016, we entered into a $2.0 billion senior unsecured revolving credit facility, and any amounts outstanding under this facility will be due and payable on May 20, 2021. As of June 30, 2020, no amounts had been drawn down, and we were in compliance with the covenants under this facility.