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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

Changes in Estimates at Completion

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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.

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