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Long-term Debt	12 Months Ended
Long-term Debt	Dec. 31, 2016
Debt Disclosure [Abstract]
Long-term Debt	Long-term Debt In May 2016, we terminated our undrawn five-year senior unsecured revolving credit facility that allowed us to borrow up to $6.5 billion and entered into a $2.0 billion senior unsecured revolving credit facility (2016 Facility). Any amounts outstanding under the 2016 Facility will be due and payable on May 20, 2021. As of December 31, 2016, no amounts had been drawn down and we were in compliance with the covenants under the 2016 Facility.