Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2020

Revenue Recognition [Abstract]

Disaggregation of Revenue

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

	Year Ended December 31,
	2020		2019
	(in millions)
Oil sales	$	2,871	$	4,168
NGL sales	490		510
Gas sales	269		238
Total commodities sales	3,630		4,916
Sales of purchased oil	3,359		4,726
Sales of purchased gas	24		29
Sales of purchased diesel	11		—
Total sales of purchased commodities	3,394		4,755
Total revenue from contracts with purchasers	$	7,024	$	9,671