Revenues and Accounts Receivable - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Crude Oil
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 40,550	$ 22,327	$ 31,383
Crude Oil | Product sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	39,635	21,250	30,156
Crude Oil | Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	484	570	722
Crude Oil | Terminalling, Storage and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	431	507	505
NGL
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,399	1,475	2,323
NGL | Product sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,292	1,350	2,211
NGL | Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	25	29	32
NGL | Terminalling, Storage and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	82	96	80
Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	42,949	23,802	33,706
Operating Segments | Crude Oil
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	40,550	22,327	31,383
Operating Segments | NGL
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 2,399	$ 1,475	$ 2,323