Revenues and Accounts Receivable - Segment Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Total revenues	$ 13,694	$ 8,383
Crude Oil
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	13,102	7,946
NGL
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	879	801
Operating Segments
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	13,981	8,747
Other items in revenues	(167)	(255)
Total revenues	13,814	8,492
Operating Segments | Crude Oil
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	13,102	7,946
Other items in revenues	(23)	(93)
Total revenues	13,079	7,853
Operating Segments | NGL
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	879	801
Other items in revenues	(144)	(162)
Total revenues	735	639
Intersegment revenue elimination
Disaggregation of Revenue [Line Items]
Total revenues	$ (120)	$ (109)