Revenue Recognition - Disaggregation of revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of revenue
Revenue from customers	$ 4,004	$ 3,763
Consolidated	3,435	3,694
United States
Disaggregation of revenue
Consolidated	2,451	2,696
Middle East
Disaggregation of revenue
Consolidated	1,005	985
Latin America
Disaggregation of revenue
Consolidated	182	226
Other International
Disaggregation of revenue
Consolidated	19	21
Eliminations
Disaggregation of revenue
Revenue from customers	(222)	(234)
Consolidated	(222)	(234)
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 Segment
Disaggregation of revenue
Revenue from customers	2,351	2,454
Oil and Gas Segment | Oil
Disaggregation of revenue
Revenue from customers	2,098	2,190
Oil and Gas Segment | NGL
Disaggregation of revenue
Revenue from customers	143	140
Oil and Gas Segment | Gas
Disaggregation of revenue
Revenue from customers	130	121
Oil and Gas Segment | Other
Disaggregation of revenue
Revenue from customers	(20)	3
Oil and Gas Segment | United States
Disaggregation of revenue
Revenue from customers	1,309	1,391
Oil and Gas Segment | United States | Oil
Disaggregation of revenue
Revenue from customers	1,205	1,247
Oil and Gas Segment | United States | NGL
Disaggregation of revenue
Revenue from customers	78	89
Oil and Gas Segment | United States | Gas
Disaggregation of revenue
Revenue from customers	47	52
Oil and Gas Segment | United States | Other
Disaggregation of revenue
Revenue from customers	(21)	3
Oil and Gas Segment | Middle East
Disaggregation of revenue
Revenue from customers	903	889
Oil and Gas Segment | Middle East | Oil
Disaggregation of revenue
Revenue from customers	758	773
Oil and Gas Segment | Middle East | NGL
Disaggregation of revenue
Revenue from customers	65	51
Oil and Gas Segment | Middle East | Gas
Disaggregation of revenue
Revenue from customers	79	65
Oil and Gas Segment | Middle East | Other
Disaggregation of revenue
Revenue from customers	1	0
Oil and Gas Segment | Latin America
Disaggregation of revenue
Revenue from customers	139	174
Oil and Gas Segment | Latin America | Oil
Disaggregation of revenue
Revenue from customers	135	170
Oil and Gas Segment | Latin America | NGL
Disaggregation of revenue
Revenue from customers	0	0
Oil and Gas Segment | Latin America | Gas
Disaggregation of revenue
Revenue from customers	4	4
Oil and Gas Segment | Latin America | Other
Disaggregation of revenue
Revenue from customers	0	0
Oil and Gas Segment | Other International
Disaggregation of revenue
Revenue from customers	0	0
Oil and Gas Segment | Other International | Oil
Disaggregation of revenue
Revenue from customers	0	0
Oil and Gas Segment | Other International | NGL
Disaggregation of revenue
Revenue from customers	0	0
Oil and Gas Segment | Other International | Gas
Disaggregation of revenue
Revenue from customers	0	0
Oil and Gas Segment | Other International | Other
Disaggregation of revenue
Revenue from customers	0	0
Oil and Gas Segment | Eliminations
Disaggregation of revenue
Revenue from customers	0	0
Oil and Gas Segment | Eliminations | Oil
Disaggregation of revenue
Revenue from customers	0	0
Oil and Gas Segment | Eliminations | NGL
Disaggregation of revenue
Revenue from customers	0	0
Oil and Gas Segment | Eliminations | Gas
Disaggregation of revenue
Revenue from customers	0	0
Oil and Gas Segment | Eliminations | Other
Disaggregation of revenue
Revenue from customers	0	0
Chemical Segment
Disaggregation of revenue
Revenue from customers	1,055	1,122
Chemical Segment | United States
Disaggregation of revenue
Revenue from customers	993	1,049
Chemical Segment | Middle East
Disaggregation of revenue
Revenue from customers	0	0
Chemical Segment | Latin America
Disaggregation of revenue
Revenue from customers	43	52
Chemical Segment | Other International
Disaggregation of revenue
Revenue from customers	19	21
Chemical Segment | Eliminations
Disaggregation of revenue
Revenue from customers	0	0
Midstream Segment
Disaggregation of revenue
Revenue from customers	251	352
Midstream Segment | Gas Processing
Disaggregation of revenue
Revenue from customers	207	233
Midstream Segment | Pipelines
Disaggregation of revenue
Revenue from customers		94
Midstream Segment | Power and Other
Disaggregation of revenue
Revenue from customers	44	25
Midstream Segment | United States
Disaggregation of revenue
Revenue from customers	149	256
Midstream Segment | United States | Gas Processing
Disaggregation of revenue
Revenue from customers	105	137
Midstream Segment | United States | Pipelines
Disaggregation of revenue
Revenue from customers		94
Midstream Segment | United States | Power and Other
Disaggregation of revenue
Revenue from customers	44	25
Midstream Segment | Middle East
Disaggregation of revenue
Revenue from customers	102	96
Midstream Segment | Middle East | Gas Processing
Disaggregation of revenue
Revenue from customers	102	96
Midstream Segment | Middle East | Pipelines
Disaggregation of revenue
Revenue from customers		0
Midstream Segment | Middle East | Power and Other
Disaggregation of revenue
Revenue from customers	0	0
Midstream Segment | Latin America
Disaggregation of revenue
Revenue from customers	0	0
Midstream Segment | Latin America | Gas Processing
Disaggregation of revenue
Revenue from customers	0	0
Midstream Segment | Latin America | Pipelines
Disaggregation of revenue
Revenue from customers		0
Midstream Segment | Latin America | Power and Other
Disaggregation of revenue
Revenue from customers	0	0
Midstream Segment | Other International
Disaggregation of revenue
Revenue from customers	0	0
Midstream Segment | Other International | Gas Processing
Disaggregation of revenue
Revenue from customers	0	0
Midstream Segment | Other International | Pipelines
Disaggregation of revenue
Revenue from customers		0
Midstream Segment | Other International | Power and Other
Disaggregation of revenue
Revenue from customers	0	0
Midstream Segment | Eliminations
Disaggregation of revenue
Revenue from customers	0	0
Midstream Segment | Eliminations | Gas Processing
Disaggregation of revenue
Revenue from customers	0	0
Midstream Segment | Eliminations | Pipelines
Disaggregation of revenue
Revenue from customers		0
Midstream Segment | Eliminations | Power and Other
Disaggregation of revenue
Revenue from customers	$ 0	$ 0