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Unapproved change orders and claims (Schedule) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Contractors [Abstract] |  |
Unapproved change orders | $ 31 | $ 115
Changes in estimates at completion | 71 | 87
Adjustments due to approvals | (42) | (171)
Adjustment due to dispositions of businesses | (14) | 0
Unapproved change orders | 46 | 31
Unapproved Change Orders And Claims Recorded In Revenues | $ 41 | $ 24

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- Definition Adjustment to Change Orders Due to Dispositions + References No definition available. + Details
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- Definition Change Orders Approved by Customer + References No definition available. + Details
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- Definition Changes in Estimates at Completion + References No definition available. + Details
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- Definition Unapproved Change Orders And Claims Recorded In Revenues + References No definition available. + Details
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- References No definition available. + Details
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- Definition The amount of costs incurred on unapproved change orders when it is probable that the cost will be recovered through a change in the contract price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 910 -SubTopic 310 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51673017&loc=d3e49324-109356 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 910 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51666792&loc=d3e50000-109363 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph c(3) -Article 5 + Details
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