Revenues - Revenues from Contracts with Customers by Product Type and Geographic Areas (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 1,761	$ 1,177
United States E&P
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,714	1,132
United States E&P | Eagle Ford
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	538	334
United States E&P | Bakken
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	784	438
United States E&P | Oklahoma
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	214	207
United States E&P | Northern Delaware
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	115	111
United States E&P | Other U.S.
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	63	42
United States E&P | Crude oil and condensate
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,341	791
United States E&P | Crude oil and condensate | Eagle Ford
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	459	259
United States E&P | Crude oil and condensate | Bakken
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	652	372
United States E&P | Crude oil and condensate | Oklahoma
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	99	61
United States E&P | Crude oil and condensate | Northern Delaware
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	88	77
United States E&P | Crude oil and condensate | Other U.S.
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	43	22
United States E&P | Natural gas liquids
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	216	116
United States E&P | Natural gas liquids | Eagle Ford
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	44	26
United States E&P | Natural gas liquids | Bakken
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	89	41
United States E&P | Natural gas liquids | Oklahoma
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	59	37
United States E&P | Natural gas liquids | Northern Delaware
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	15	9
United States E&P | Natural gas liquids | Other U.S.
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	9	3
United States E&P | Natural gas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	151	215
United States E&P | Natural gas | Eagle Ford
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	33	47
United States E&P | Natural gas | Bakken
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	43	25
United States E&P | Natural gas | Oklahoma
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	56	109
United States E&P | Natural gas | Northern Delaware
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	12	25
United States E&P | Natural gas | Other U.S.
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	7	9
United States E&P | Other
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	6	10
United States E&P | Other | Eagle Ford
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	2	2
United States E&P | Other | Bakken
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0
United States E&P | Other | Oklahoma
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0
United States E&P | Other | Northern Delaware
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0
United States E&P | Other | Other U.S.
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	4	8
International E&P | International, Equatorial Guinea (E.G.)
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	47	45
International E&P | Crude oil and condensate | International, Equatorial Guinea (E.G.)
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	40	37
International E&P | Natural gas liquids | International, Equatorial Guinea (E.G.)
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1	1
International E&P | Natural gas | International, Equatorial Guinea (E.G.)
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	5	7
International E&P | Other | International, Equatorial Guinea (E.G.)
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 1	$ 0