Revenue - Disaggregation of revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of revenue
Revenue from customers	$ 5,047	$ 3,435
United States
Disaggregation of revenue
Revenue from customers	4,439	2,451
Middle East
Disaggregation of revenue
Revenue from customers	653	1,005
Latin America
Disaggregation of revenue
Revenue from customers	189	182
Other International
Disaggregation of revenue
Revenue from customers	(35)	19
Eliminations
Disaggregation of revenue
Revenue from customers	(199)	(222)
Eliminations | United States
Disaggregation of revenue
Revenue from customers	0	0
Eliminations | Middle East
Disaggregation of revenue
Revenue from customers	0	0
Eliminations | Latin America
Disaggregation of revenue
Revenue from customers	0	0
Eliminations | Other International
Disaggregation of revenue
Revenue from customers	0	0
Oil and Gas
Disaggregation of revenue
Revenue from customers	3,898	2,351
Oil and Gas | Oil
Disaggregation of revenue
Revenue from customers	3,351	2,098
Oil and Gas | NGL
Disaggregation of revenue
Revenue from customers	268	143
Oil and Gas | Gas
Disaggregation of revenue
Revenue from customers	268	130
Oil and Gas | Other
Disaggregation of revenue
Revenue from customers	11	(20)
Oil and Gas | United States
Disaggregation of revenue
Revenue from customers	3,162	1,309
Oil and Gas | United States | Oil
Disaggregation of revenue
Revenue from customers	2,755	1,205
Oil and Gas | United States | NGL
Disaggregation of revenue
Revenue from customers	213	78
Oil and Gas | United States | Gas
Disaggregation of revenue
Revenue from customers	183	47
Oil and Gas | United States | Other
Disaggregation of revenue
Revenue from customers	11	(21)
Oil and Gas | Middle East
Disaggregation of revenue
Revenue from customers	582	903
Oil and Gas | Middle East | Oil
Disaggregation of revenue
Revenue from customers	447	758
Oil and Gas | Middle East | NGL
Disaggregation of revenue
Revenue from customers	55	65
Oil and Gas | Middle East | Gas
Disaggregation of revenue
Revenue from customers	80	79
Oil and Gas | Middle East | Other
Disaggregation of revenue
Revenue from customers	0	1
Oil and Gas | Latin America
Disaggregation of revenue
Revenue from customers	154	139
Oil and Gas | Latin America | Oil
Disaggregation of revenue
Revenue from customers	149	135
Oil and Gas | Latin America | NGL
Disaggregation of revenue
Revenue from customers	0	0
Oil and Gas | Latin America | Gas
Disaggregation of revenue
Revenue from customers	5	4
Oil and Gas | Latin America | Other
Disaggregation of revenue
Revenue from customers	0	0
Oil and Gas | Other International
Disaggregation of revenue
Revenue from customers	0	0
Oil and Gas | Other International | Oil
Disaggregation of revenue
Revenue from customers	0	0
Oil and Gas | Other International | NGL
Disaggregation of revenue
Revenue from customers	0	0
Oil and Gas | Other International | Gas
Disaggregation of revenue
Revenue from customers	0	0
Oil and Gas | Other International | Other
Disaggregation of revenue
Revenue from customers	0	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	961	1,055
Chemical | United States
Disaggregation of revenue
Revenue from customers	910	993
Chemical | Middle East
Disaggregation of revenue
Revenue from customers	0	0
Chemical | Latin America
Disaggregation of revenue
Revenue from customers	35	43
Chemical | Other International
Disaggregation of revenue
Revenue from customers	16	19
Chemical | Eliminations
Disaggregation of revenue
Revenue from customers	0	0
Midstream and Marketing
Disaggregation of revenue
Revenue from customers	387	251
Midstream and Marketing | Gas Processing
Disaggregation of revenue
Revenue from customers	176	207
Midstream and Marketing | Marketing
Disaggregation of revenue
Revenue from customers	195
Midstream and Marketing | Power and Other
Disaggregation of revenue
Revenue from customers	16	44
Midstream and Marketing | United States
Disaggregation of revenue
Revenue from customers	367	149
Midstream and Marketing | United States | Gas Processing
Disaggregation of revenue
Revenue from customers	105	105
Midstream and Marketing | United States | Marketing
Disaggregation of revenue
Revenue from customers	246
Midstream and Marketing | United States | Power and Other
Disaggregation of revenue
Revenue from customers	16	44
Midstream and Marketing | Middle East
Disaggregation of revenue
Revenue from customers	71	102
Midstream and Marketing | Middle East | Gas Processing
Disaggregation of revenue
Revenue from customers	71	102
Midstream and Marketing | Middle East | Marketing
Disaggregation of revenue
Revenue from customers	0
Midstream and Marketing | Middle East | Power and Other
Disaggregation of revenue
Revenue from customers	0	0
Midstream and Marketing | Latin America
Disaggregation of revenue
Revenue from customers	0	0
Midstream and Marketing | Latin America | Gas Processing
Disaggregation of revenue
Revenue from customers	0	0
Midstream and Marketing | Latin America | Marketing
Disaggregation of revenue
Revenue from customers	0
Midstream and Marketing | Latin America | Power and Other
Disaggregation of revenue
Revenue from customers	0	0
Midstream and Marketing | Other International
Disaggregation of revenue
Revenue from customers	(51)	0
Midstream and Marketing | Other International | Gas Processing
Disaggregation of revenue
Revenue from customers	0	0
Midstream and Marketing | Other International | Marketing
Disaggregation of revenue
Revenue from customers	(51)
Midstream and Marketing | Other International | Power and Other
Disaggregation of revenue
Revenue from customers	0	0
Midstream and Marketing | Eliminations
Disaggregation of revenue
Revenue from customers	0	0
Midstream and Marketing | Eliminations | Gas Processing
Disaggregation of revenue
Revenue from customers	0	0
Midstream and Marketing | Eliminations | Marketing
Disaggregation of revenue
Revenue from customers	0
Midstream and Marketing | Eliminations | Power and Other
Disaggregation of revenue
Revenue from customers	$ 0	$ 0