Revenue Recognition (Tables)

6 Months Ended

Jun. 30, 2020

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

Disaggregated revenue from contracts with purchasers by product type is as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
	(in millions)
Oil sales	$	453	$	1,048	$	1,377	$	1,965
NGL sales	104		120		215		257
Gas sales	43		28		103		110
Total oil and gas sales	600		1,196		1,695		2,332
Sales of purchased oil	536		1,182		1,439		2,289
Sales of purchased gas	5		1		17		3
Total sales of purchased oil and gas	541		1,183		1,456		2,292
Total revenue from contracts with purchasers	$	1,141	$	2,379	$	3,151	$	4,624