Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Total revenue	$ 5,141	$ 6,057	$ 14,298	$ 19,210
Oil sales
Disaggregation of Revenue [Line Items]
Total revenue	2,823	3,069	7,715	9,594
NGL sales
Disaggregation of Revenue [Line Items]
Total revenue	416	569	1,197	1,783
Gas sales
Disaggregation of Revenue [Line Items]
Total revenue	221	586	691	1,417
Total oil and gas revenues
Disaggregation of Revenue [Line Items]
Total revenue	3,460	4,224	9,603	12,794
Sales of purchased oil
Disaggregation of Revenue [Line Items]
Total revenue	1,677	1,805	4,688	6,356
Sales of purchased gas
Disaggregation of Revenue [Line Items]
Total revenue	4	28	7	60
Total sales of purchased commodities
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,681	$ 1,833	$ 4,695	$ 6,416