Revenue - Disaggregation of revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of revenue
Revenue from customers	$ 8,213	$ 5,184
United States
Disaggregation of revenue
Revenue from customers	7,453	4,604
International
Disaggregation of revenue
Revenue from customers	1,052	846
Eliminations
Disaggregation of revenue
Revenue from customers	(292)	(266)
Oil and gas
Disaggregation of revenue
Revenue from customers	6,075	3,735
Oil and gas | Oil
Disaggregation of revenue
Revenue from customers	4,799	3,013
Oil and gas | NGL
Disaggregation of revenue
Revenue from customers	760	436
Oil and gas | Gas
Disaggregation of revenue
Revenue from customers	513	317
Oil and gas | Other
Disaggregation of revenue
Revenue from customers	3	(31)
Oil and gas | United States
Disaggregation of revenue
Revenue from customers	5,203	3,070
Oil and gas | United States | Oil
Disaggregation of revenue
Revenue from customers	4,048	2,464
Oil and gas | United States | NGL
Disaggregation of revenue
Revenue from customers	698	384
Oil and gas | United States | Gas
Disaggregation of revenue
Revenue from customers	455	253
Oil and gas | United States | Other
Disaggregation of revenue
Revenue from customers	2	(31)
Oil and gas | International
Disaggregation of revenue
Revenue from customers	872	665
Oil and gas | International | Oil
Disaggregation of revenue
Revenue from customers	751	549
Oil and gas | International | NGL
Disaggregation of revenue
Revenue from customers	62	52
Oil and gas | International | Gas
Disaggregation of revenue
Revenue from customers	58	64
Oil and gas | International | Other
Disaggregation of revenue
Revenue from customers	1	0
Oil and gas | Eliminations
Disaggregation of revenue
Revenue from customers	0	0
Oil and gas | Eliminations | Oil
Disaggregation of revenue
Revenue from customers	0	0
Oil and gas | Eliminations | NGL
Disaggregation of revenue
Revenue from customers	0	0
Oil and gas | Eliminations | Gas
Disaggregation of revenue
Revenue from customers	0	0
Oil and gas | Eliminations | Other
Disaggregation of revenue
Revenue from customers	0	0
Chemical
Disaggregation of revenue
Revenue from customers	1,683	1,087
Chemical | United States
Disaggregation of revenue
Revenue from customers	1,602	1,037
Chemical | International
Disaggregation of revenue
Revenue from customers	81	50
Chemical | Eliminations
Disaggregation of revenue
Revenue from customers	0	0
Midstream and marketing
Disaggregation of revenue
Revenue from customers	747	628
Midstream and marketing | United States
Disaggregation of revenue
Revenue from customers	648	497
Midstream and marketing | International
Disaggregation of revenue
Revenue from customers	99	131
Midstream and marketing | Eliminations
Disaggregation of revenue
Revenue from customers	$ 0	$ 0