Acquisitions (Notes)	3 Months Ended
	Mar. 31, 2020
Acquisitions [Abstract]
Business Combination Disclosure [Text Block]	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:8px;padding-top:20px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Acquisitions</font></div><div style="line-height:120%;padding-bottom:6px;padding-top:6px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In the fourth quarter of 2019, we acquired approximately </font><font style="font-family:inherit;font-size:10pt;">40,000</font><font style="font-family:inherit;font-size:10pt;"> net acres in a Texas Delaware oil play in West Texas for </font><font style="font-family:inherit;font-size:10pt;">$106 million</font><font style="font-family:inherit;font-size:10pt;">. We accounted for these transactions as an asset acquisition, allocating the purchase price to unproved property within property, plant and equipment. </font></div><div style="line-height:120%;padding-bottom:6px;padding-top:6px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">During the fourth quarter of 2019, we acquired a 100% working interest in approximately </font><font style="font-family:inherit;font-size:10pt;">18,000</font><font style="font-family:inherit;font-size:10pt;"> net acres in the Eagle Ford from Rocky Creek Resources, LLC and RCR Midstream, LLC for </font><font style="font-family:inherit;font-size:10pt;">$191 million</font><font style="font-family:inherit;font-size:10pt;"> in cash, subject to closing adjustments. </font></div></div>