Revenue - Disaggregation of revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of revenue
Revenue from customers	$ 10,351	$ 6,102	$ 18,564	$ 11,286
United States
Disaggregation of revenue
Revenue from customers	9,070	5,284	16,523	9,888
International
Disaggregation of revenue
Revenue from customers	1,684	1,049	2,736	1,895
Eliminations
Disaggregation of revenue
Revenue from customers	(403)	(231)	(695)	(497)
Eliminations | United States
Disaggregation of revenue
Revenue from customers	0	0	0	0
Eliminations | International
Disaggregation of revenue
Revenue from customers	0	0	0	0
Oil and gas
Disaggregation of revenue
Revenue from customers	7,696	4,672	13,771	8,407
Oil and gas | Oil
Disaggregation of revenue
Revenue from customers	6,040	3,711	10,839	6,724
Oil and gas | NGL
Disaggregation of revenue
Revenue from customers	896	550	1,656	986
Oil and gas | Gas
Disaggregation of revenue
Revenue from customers	754	387	1,267	704
Oil and gas | Other
Disaggregation of revenue
Revenue from customers	6	24	9	(7)
Oil and gas | United States
Disaggregation of revenue
Revenue from customers	6,357	3,834	11,560	6,904
Oil and gas | United States | Oil
Disaggregation of revenue
Revenue from customers	4,894	3,028	8,942	5,492
Oil and gas | United States | NGL
Disaggregation of revenue
Revenue from customers	783	472	1,481	856
Oil and gas | United States | Gas
Disaggregation of revenue
Revenue from customers	675	311	1,130	564
Oil and gas | United States | Other
Disaggregation of revenue
Revenue from customers	5	23	7	(8)
Oil and gas | International
Disaggregation of revenue
Revenue from customers	1,339	838	2,211	1,503
Oil and gas | International | Oil
Disaggregation of revenue
Revenue from customers	1,146	683	1,897	1,232
Oil and gas | International | NGL
Disaggregation of revenue
Revenue from customers	113	78	175	130
Oil and gas | International | Gas
Disaggregation of revenue
Revenue from customers	79	76	137	140
Oil and gas | International | Other
Disaggregation of revenue
Revenue from customers	1	1	2	1
Oil and gas | Eliminations
Disaggregation of revenue
Revenue from customers	0	0	0	0
Oil and gas | Eliminations | Oil
Disaggregation of revenue
Revenue from customers	0	0	0	0
Oil and gas | Eliminations | NGL
Disaggregation of revenue
Revenue from customers	0	0	0	0
Oil and gas | Eliminations | Gas
Disaggregation of revenue
Revenue from customers	0	0	0	0
Oil and gas | Eliminations | Other
Disaggregation of revenue
Revenue from customers	0	0	0	0
Chemical
Disaggregation of revenue
Revenue from customers	1,908	1,187	3,591	2,274
Chemical | United States
Disaggregation of revenue
Revenue from customers	1,810	1,128	3,412	2,165
Chemical | International
Disaggregation of revenue
Revenue from customers	98	59	179	109
Chemical | Eliminations
Disaggregation of revenue
Revenue from customers	0	0	0	0
Midstream and marketing
Disaggregation of revenue
Revenue from customers	1,150	474	1,897	1,102
Midstream and marketing | United States
Disaggregation of revenue
Revenue from customers	903	322	1,551	819
Midstream and marketing | International
Disaggregation of revenue
Revenue from customers	247	152	346	283
Midstream and marketing | Eliminations
Disaggregation of revenue
Revenue from customers	$ 0	$ 0	$ 0	$ 0