Subsequent Events	3 Months Ended
Mar. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events In May 2019, the Company completed the sale of its Eagle Ford assets and other remaining assets in South Texas to an unaffiliated third party. The sale of these assets is expected to result in a pretax loss of $400 million to $550 million during the second quarter of 2019. The Company expects to recognize a liability associated with the sale for estimated deficiency fees retained by the Company on unused minimum volume commitments. Additionally, under the agreement, the Company expects to receive up to $475 million in total proceeds, of which $25 million was received at closing and $450 million is contingent on future commodity prices. The contingent proceeds will be valued based on the probability-weighted estimate of proceeds that will be received over the earn-out period using forecasted commodity prices. The contingent proceeds will be determined annually over the 2020 through 2024-time periods based on actual commodity prices for each year. The contingent proceeds, if any, will be received between 2023 and 2025. In May 2019, the Company announced its plans to divest of its ownership interest in certain gas gathering and processing assets operated by a third party. The Company expects this divestiture process to be completed before the end of 2019, although no assurance can be given that this divestiture will be completed in accordance with the Company's plans or on terms and at a price that is acceptable to the Company. In April 2019, the Company adopted a voluntary separation program (“VSP”) for certain eligible employees. Eligible employees who voluntarily choose to participate in the program will receive certain severance and related benefits above the Company's customary involuntary termination benefits. The Company plans to further reduce its headcount levels during the second quarter of 2019 with an involuntary separation program. Based on initial estimates, the Company expects to recognize between $140 million and $180 million of severance and related benefit costs associated with the voluntary and involuntary programs during the second quarter of 2019, of which approximately 25 percent is expected to be noncash charges related to the accelerated vesting of certain equity awards.

Subsequent Events

In May 2019, the Company completed the sale of its Eagle Ford assets and other remaining assets in South Texas to an unaffiliated third party. The sale of these assets is expected to result in a pretax loss of $400 million to $550 million during the second quarter of 2019. The Company expects to recognize a liability associated with the sale for estimated deficiency fees retained by the Company on unused minimum volume commitments. Additionally, under the agreement, the Company expects to receive up to $475 million in total proceeds, of which $25 million was received at closing and $450 million is contingent on future commodity prices. The contingent proceeds will be valued based on the probability-weighted estimate of proceeds that will be received over the earn-out period using forecasted commodity prices. The contingent proceeds will be determined annually over the 2020 through 2024-time periods based on actual commodity prices for each year. The contingent proceeds, if any, will be received between 2023 and 2025.

In May 2019, the Company announced its plans to divest of its ownership interest in certain gas gathering and processing assets operated by a third party. The Company expects this divestiture process to be completed before the end of 2019, although no assurance can be given that this divestiture will be completed in accordance with the Company's plans or on terms and at a price that is acceptable to the Company.

In April 2019, the Company adopted a voluntary separation program (“VSP”) for certain eligible employees. Eligible employees who voluntarily choose to participate in the program will receive certain severance and related benefits above the Company's customary involuntary termination benefits. The Company plans to further reduce its headcount levels during the second quarter of 2019 with an involuntary separation program. Based on initial estimates, the Company expects to recognize between $140 million and $180 million of severance and related benefit costs associated with the voluntary and involuntary programs during the second quarter of 2019, of which approximately 25 percent is expected to be noncash charges related to the accelerated vesting of certain equity awards.