Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue - Service revenue	$ 4,961	$ 1,857	$ 12,294	$ 5,008
Oil sales
Disaggregation of Revenue [Line Items]
Revenue - Service revenue	2,477	724	6,043	2,101
NGL sales
Disaggregation of Revenue [Line Items]
Revenue - Service revenue	515	129	1,135	344
Gas sales
Disaggregation of Revenue [Line Items]
Revenue - Service revenue	290	69	609	172
Total oil and gas revenues
Disaggregation of Revenue [Line Items]
Revenue - Service revenue	3,282	922	7,787	2,617
Sales of purchased oil
Disaggregation of Revenue [Line Items]
Revenue - Service revenue	1,642	934	4,422	2,373
Sales of purchased gas
Disaggregation of Revenue [Line Items]
Revenue - Service revenue	22	1	38	18
Sales of purchased diesel
Disaggregation of Revenue [Line Items]
Revenue - Service revenue	15	0	47	0
Total sales of purchased commodities
Disaggregation of Revenue [Line Items]
Revenue - Service revenue	$ 1,679	$ 935	$ 4,507	$ 2,391