Revenue Recognition - Disaggregation of revenue (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Disaggregation of revenue
Revenue from customers	$ 3,694
United States
Disaggregation of revenue
Revenue from customers	2,462
Middle East
Disaggregation of revenue
Revenue from customers	985
Latin America
Disaggregation of revenue
Revenue from customers	226
Other International
Disaggregation of revenue
Revenue from customers	21
Corporate & Eliminations
Disaggregation of revenue
Revenue from customers	(234)
Corporate & Eliminations | United States
Disaggregation of revenue
Revenue from customers	(234)
Oil and Gas Segment
Disaggregation of revenue
Revenue from customers	2,454
Oil and Gas Segment | Oil
Disaggregation of revenue
Revenue from customers	2,190
Oil and Gas Segment | NGL
Disaggregation of revenue
Revenue from customers	140
Oil and Gas Segment | Gas
Disaggregation of revenue
Revenue from customers	121
Oil and Gas Segment | Other
Disaggregation of revenue
Revenue from customers	3
Oil and Gas Segment | United States
Disaggregation of revenue
Revenue from customers	1,391
Oil and Gas Segment | United States | Oil
Disaggregation of revenue
Revenue from customers	1,247
Oil and Gas Segment | United States | NGL
Disaggregation of revenue
Revenue from customers	89
Oil and Gas Segment | United States | Gas
Disaggregation of revenue
Revenue from customers	52
Oil and Gas Segment | United States | Other
Disaggregation of revenue
Revenue from customers	3
Oil and Gas Segment | Middle East
Disaggregation of revenue
Revenue from customers	889
Oil and Gas Segment | Middle East | Oil
Disaggregation of revenue
Revenue from customers	773
Oil and Gas Segment | Middle East | NGL
Disaggregation of revenue
Revenue from customers	51
Oil and Gas Segment | Middle East | Gas
Disaggregation of revenue
Revenue from customers	65
Oil and Gas Segment | Latin America
Disaggregation of revenue
Revenue from customers	174
Oil and Gas Segment | Latin America | Oil
Disaggregation of revenue
Revenue from customers	170
Oil and Gas Segment | Latin America | Gas
Disaggregation of revenue
Revenue from customers	4
Chemical Segment
Disaggregation of revenue
Revenue from customers	1,122
Chemical Segment | United States
Disaggregation of revenue
Revenue from customers	1,049
Chemical Segment | Latin America
Disaggregation of revenue
Revenue from customers	52
Chemical Segment | Other International
Disaggregation of revenue
Revenue from customers	21
Midstream Segment
Disaggregation of revenue
Revenue from customers	352
Midstream Segment | Gas Processing
Disaggregation of revenue
Revenue from customers	233
Midstream Segment | Pipelines
Disaggregation of revenue
Revenue from customers	94
Midstream Segment | Power and Other
Disaggregation of revenue
Revenue from customers	25
Midstream Segment | United States
Disaggregation of revenue
Revenue from customers	256
Midstream Segment | United States | Gas Processing
Disaggregation of revenue
Revenue from customers	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	25
Midstream Segment | Middle East
Disaggregation of revenue
Revenue from customers	96
Midstream Segment | Middle East | Gas Processing
Disaggregation of revenue
Revenue from customers	$ 96