Revenue Recognition (Tables)

9 Months Ended

Sep. 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 September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
	(in millions)
Oil sales	$	724	$	1,068	$	2,101	$	3,032
NGL sales	129		116		344		373
Gas sales	69		51		172		162
Total oil and gas sales	922		1,235		2,617		3,567
Sales of purchased oil	934		1,166		2,373		3,455
Sales of purchased gas	1		5		18		8
Total sales of purchased oil and gas	935		1,171		2,391		3,463
Total revenue from contracts with purchasers	$	1,857	$	2,406	$	5,008	$	7,030