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Business Segment Information Business Segment Information Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |
Changes in estimates at completion | $ 71 | $ 87 |
Power Projects [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Changes in estimates at completion | 16 | 80 |
Favorable [Member] | Canadian Pipe Fabrication And Module Assembly Projects [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Changes in estimates at completion | $ 21 |  |
Unfavorable [Member] | Canadian Pipe Fabrication And Module Assembly Projects [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Changes in estimates at completion |  | $ (72) | $ (132)

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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