Revenues and Accounts Receivable - Segment Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Total revenues	$ 42,078	$ 23,290	$ 33,669
Crude Oil
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	40,550	22,327	31,383
NGL
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	2,399	1,475	2,323
Operating Segments
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	42,949	23,802	33,706
Other items in revenues	(511)	(243)	388
Total revenues	42,438	23,559	34,094
Operating Segments | Crude Oil
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	40,550	22,327	31,383
Other items in revenues	(80)	(128)	272
Total revenues	40,470	22,199	31,655
Operating Segments | NGL
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	2,399	1,475	2,323
Other items in revenues	(431)	(115)	116
Total revenues	1,968	1,360	2,439
Intersegment revenues elimination
Disaggregation of Revenue [Line Items]
Total revenues	$ (360)	$ (269)	$ (425)