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Other Operating Expenses	6 Months Ended
Other Operating Expenses	Jun. 30, 2018
Asset Impairment Charges [Abstract]
Other Operating Expenses	Other Operating Expenses In the Prior Quarter and the Prior Period, we terminated future natural gas transportation commitments related to divested assets for cash payments of $23 million and $126 million. In the Prior Period, we paid $290 million to assign an oil transportation agreement to a third party.