PROJECT CHANGES IN ESTIMATES	9 Months Ended
Sep. 30, 2018
Accounting Policies [Abstract]
PROJECT CHANGES IN ESTIMATES	NOTE 5—PROJECT CHANGES IN ESTIMATES Our RPOs for each of our operating groups generally consist of several hundred contracts and our results may be impacted by changes in estimated margins. The following is a discussion of our most significant changes in cost estimates that impacted segment operating income for the three and nine months ended September 30, 2018 and 2017. For discussion of significant changes in estimates on loss projects impacting the fair value of our acquired balance sheet in the Combination, see Note 4, Revenue Recognition. Three and nine months ended September 30, 2018 Segment operating income for the three and nine months ended September 30, 2018 was positively impacted by net favorable changes in estimates totaling approximately $79 million and $200 million, respectively, primarily in our NCSA, MENA and APAC segments. NCSA—Our segment results for the three and nine months ended September 30, 2018 were positively impacted by net favorable changes in estimates aggregating approximately $18 million, primarily due to cost savings on our ethane projects in Texas and Louisiana. MENA—Our segment results for the three months and nine months ended September 30, 2018 were positively impacted by net favorable changes in estimates aggregating approximately $49 million and $118 million, respectively, primarily due to productivity improvements and cost savings on marine, fabrication and other activities, primarily on three of our projects in the Middle East. APAC—Our segment results for the three months ended September 30, 2018 were positively impacted by net favorable changes in estimates aggregating approximately $9 million. The net favorable changes were due to savings upon substantial completion of the post lay campaign on the Greater Western Flank Phase 2 project in Australia. Our segment results for the nine months ended September 30, 2018 were positively impacted by net favorable changes in estimates aggregating approximately $64 million. The net favorable changes were due to reductions in costs to complete on offshore campaigns and several other active projects, primarily on two of our Australian projects, partially offset by additional costs associated with weather downtime on the two projects. Three and nine months ended September 30, 2017 Segment operating income for the three and nine months ended September 30, 2017 was positively impacted by net favorable changes in estimates totaling approximately $36 million and $115 million, respectively, primarily in our MENA (approximately $36 million and $72 million, respectively) and APAC (approximately $4 million and $44 million, respectively) segments.

NOTE 5—PROJECT CHANGES IN ESTIMATES

Our RPOs for each of our operating groups generally consist of several hundred contracts and our results may be impacted by changes in estimated margins. The following is a discussion of our most significant changes in cost estimates that impacted segment operating income for the three and nine months ended September 30, 2018 and 2017. For discussion of significant changes in estimates on loss projects impacting the fair value of our acquired balance sheet in the Combination, see Note 4, Revenue Recognition.

Three and nine months ended September 30, 2018

Segment operating income for the three and nine months ended September 30, 2018 was positively impacted by net favorable changes in estimates totaling approximately $79 million and $200 million, respectively, primarily in our NCSA, MENA and APAC segments.

NCSA—Our segment results for the three and nine months ended September 30, 2018 were positively impacted by net favorable changes in estimates aggregating approximately $18 million, primarily due to cost savings on our ethane projects in Texas and Louisiana.

MENA—Our segment results for the three months and nine months ended September 30, 2018 were positively impacted by net favorable changes in estimates aggregating approximately $49 million and $118 million, respectively, primarily due to productivity improvements and cost savings on marine, fabrication and other activities, primarily on three of our projects in the Middle East.

APAC—Our segment results for the three months ended September 30, 2018 were positively impacted by net favorable changes in estimates aggregating approximately $9 million. The net favorable changes were due to savings upon substantial completion of the post lay campaign on the Greater Western Flank Phase 2 project in Australia.

Our segment results for the nine months ended September 30, 2018 were positively impacted by net favorable changes in estimates aggregating approximately $64 million. The net favorable changes were due to reductions in costs to complete on offshore campaigns and several other active projects, primarily on two of our Australian projects, partially offset by additional costs associated with weather downtime on the two projects.

Three and nine months ended September 30, 2017

Segment operating income for the three and nine months ended September 30, 2017 was positively impacted by net favorable changes in estimates totaling approximately $36 million and $115 million, respectively, primarily in our MENA (approximately $36 million and $72 million, respectively) and APAC (approximately $4 million and $44 million, respectively) segments.