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Revenue Recognition - Disaggregation of revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of revenue
Revenue from customers	$ 3,731	$ 3,831	$ 7,166	$ 7,556
United States
Disaggregation of revenue
Revenue from customers	2,609	2,846	5,060	5,573
Middle East
Disaggregation of revenue
Revenue from customers	1,052	960	2,057	1,945
Latin America
Disaggregation of revenue
Revenue from customers	257	235	439	461
Other International
Disaggregation of revenue
Revenue from customers	18	17	37	38
Eliminations
Disaggregation of revenue
Revenue from customers	(205)	(227)	(427)	(461)
Eliminations | United States
Disaggregation of revenue
Revenue from customers	0	0	0	0
Eliminations | Middle East
Disaggregation of revenue
Revenue from customers	0	0	0	0
Eliminations | Latin America
Disaggregation of revenue
Revenue from customers	0	0	0	0
Eliminations | Other International
Disaggregation of revenue
Revenue from customers	0	0	0	0
Oil and Gas Segment
Disaggregation of revenue
Revenue from customers	2,718	2,531	5,069	4,985
Oil and Gas Segment | Oil
Disaggregation of revenue
Revenue from customers	2,484	2,232	4,582	4,422
Oil and Gas Segment | NGL
Disaggregation of revenue
Revenue from customers	152	175	295	315
Oil and Gas Segment | Gas
Disaggregation of revenue
Revenue from customers	89	118	219	239
Oil and Gas Segment | Other
Disaggregation of revenue
Revenue from customers	(7)	6	(27)	9
Oil and Gas Segment | United States
Disaggregation of revenue
Revenue from customers	1,538	1,491	2,847	2,882
Oil and Gas Segment | United States | Oil
Disaggregation of revenue
Revenue from customers	1,447	1,334	2,652	2,581
Oil and Gas Segment | United States | NGL
Disaggregation of revenue
Revenue from customers	84	111	162	200
Oil and Gas Segment | United States | Gas
Disaggregation of revenue
Revenue from customers	8	42	55	94
Oil and Gas Segment | United States | Other
Disaggregation of revenue
Revenue from customers	(1)	4	(22)	7
Oil and Gas Segment | Middle East
Disaggregation of revenue
Revenue from customers	963	856	1,866	1,745
Oil and Gas Segment | Middle East | Oil
Disaggregation of revenue
Revenue from customers	825	718	1,583	1,491
Oil and Gas Segment | Middle East | NGL
Disaggregation of revenue
Revenue from customers	68	64	133	115
Oil and Gas Segment | Middle East | Gas
Disaggregation of revenue
Revenue from customers	76	73	155	138
Oil and Gas Segment | Middle East | Other
Disaggregation of revenue
Revenue from customers	(6)	1	(5)	1
Oil and Gas Segment | Latin America
Disaggregation of revenue
Revenue from customers	217	184	356	358
Oil and Gas Segment | Latin America | Oil
Disaggregation of revenue
Revenue from customers	212	180	347	350
Oil and Gas Segment | Latin America | NGL
Disaggregation of revenue
Revenue from customers	0	0	0	0
Oil and Gas Segment | Latin America | Gas
Disaggregation of revenue
Revenue from customers	5	3	9	7
Oil and Gas Segment | Latin America | Other
Disaggregation of revenue
Revenue from customers	0	1	0	1
Oil and Gas Segment | Other International
Disaggregation of revenue
Revenue from customers	0	0	0	0
Oil and Gas Segment | Other International | Oil
Disaggregation of revenue
Revenue from customers	0	0	0	0
Oil and Gas Segment | Other International | NGL
Disaggregation of revenue
Revenue from customers	0	0	0	0
Oil and Gas Segment | Other International | Gas
Disaggregation of revenue
Revenue from customers	0	0	0	0
Oil and Gas Segment | Other International | Other
Disaggregation of revenue
Revenue from customers	0	0	0	0
Oil and Gas Segment | Eliminations
Disaggregation of revenue
Revenue from customers	0	0	0	0
Oil and Gas Segment | Eliminations | Oil
Disaggregation of revenue
Revenue from customers	0	0	0	0
Oil and Gas Segment | Eliminations | NGL
Disaggregation of revenue
Revenue from customers	0	0	0	0
Oil and Gas Segment | Eliminations | Gas
Disaggregation of revenue
Revenue from customers	0	0	0	0
Oil and Gas Segment | Eliminations | Other
Disaggregation of revenue
Revenue from customers	0	0	0	0
Chemical Segment
Disaggregation of revenue
Revenue from customers	993	1,170	2,048	2,323
Chemical Segment | United States
Disaggregation of revenue
Revenue from customers	935	1,102	1,928	2,182
Chemical Segment | Middle East
Disaggregation of revenue
Revenue from customers	0	0	0	0
Chemical Segment | Latin America
Disaggregation of revenue
Revenue from customers	40	51	83	103
Chemical Segment | Other International
Disaggregation of revenue
Revenue from customers	18	17	37	38
Chemical Segment | Eliminations
Disaggregation of revenue
Revenue from customers	0	0	0	0
Midstream Segment
Disaggregation of revenue
Revenue from customers	225	357	476	709
Midstream Segment | Gas Processing
Disaggregation of revenue
Revenue from customers	193	235	400	468
Midstream Segment | Pipelines
Disaggregation of revenue
Revenue from customers		101		195
Midstream Segment | Power and Other
Disaggregation of revenue
Revenue from customers	32	21	76	46
Midstream Segment | United States
Disaggregation of revenue
Revenue from customers	136	253	285	509
Midstream Segment | United States | Gas Processing
Disaggregation of revenue
Revenue from customers	104	131	209	268
Midstream Segment | United States | Pipelines
Disaggregation of revenue
Revenue from customers		101		195
Midstream Segment | United States | Power and Other
Disaggregation of revenue
Revenue from customers	32	21	76	46
Midstream Segment | Middle East
Disaggregation of revenue
Revenue from customers	89	104	191	200
Midstream Segment | Middle East | Gas Processing
Disaggregation of revenue
Revenue from customers	89	104	191	200
Midstream Segment | Middle East | Pipelines
Disaggregation of revenue
Revenue from customers		0		0
Midstream Segment | Middle East | Power and Other
Disaggregation of revenue
Revenue from customers	0	0	0	0
Midstream Segment | Latin America
Disaggregation of revenue
Revenue from customers	0	0	0	0
Midstream Segment | Latin America | Gas Processing
Disaggregation of revenue
Revenue from customers	0	0	0	0
Midstream Segment | Latin America | Pipelines
Disaggregation of revenue
Revenue from customers		0		0
Midstream Segment | Latin America | Power and Other
Disaggregation of revenue
Revenue from customers	0	0	0	0
Midstream Segment | Other International
Disaggregation of revenue
Revenue from customers	0	0	0	0
Midstream Segment | Other International | Gas Processing
Disaggregation of revenue
Revenue from customers	0	0	0	0
Midstream Segment | Other International | Pipelines
Disaggregation of revenue
Revenue from customers		0		0
Midstream Segment | Other International | Power and Other
Disaggregation of revenue
Revenue from customers	0	0	0	0
Midstream Segment | Eliminations
Disaggregation of revenue
Revenue from customers	0	0	0	0
Midstream Segment | Eliminations | Gas Processing
Disaggregation of revenue
Revenue from customers	0	0	0	0
Midstream Segment | Eliminations | Pipelines
Disaggregation of revenue
Revenue from customers		0		0
Midstream Segment | Eliminations | Power and Other
Disaggregation of revenue
Revenue from customers	$ 0	$ 0	$ 0	$ 0

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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