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Business Segment Information Changes in Estimates (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Change in Accounting Estimate [Line Items] |  |  |  |
Provision for Loss on Contracts | $ 60,000,000 | $ 159,000,000 | $ 109,000,000 | $ 56,000,000
Changes in estimates at completion | 71,000,000 | 87,000,000 |  |
Initial Changes [Member] |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |
Provision for Loss on Contracts | 14,000,000 | 177,000,000 | 106,000,000 |
Amortization of Loss Provision [Member] |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |
Provision for Loss on Contracts | (113,000,000) | (127,000,000) | (53,000,000) |
Power Projects [Member] |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |
Provision for Loss on Contracts | 47,000,000 | 80,000,000 |  |
Changes in estimates at completion | 16,000,000 | 80,000,000 |  |
Canadian Pipe Fabrication And Module Assembly Projects [Member] |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |
Provision for Loss on Contracts | 0 | 53,000,000 |  |
Canadian Pipe Fabrication And Module Assembly Projects [Member] | Favorable [Member] |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |
Changes in estimates at completion | $ 21,000,000 |  |  |
Canadian Pipe Fabrication And Module Assembly Projects [Member] | Unfavorable [Member] |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |
Changes in estimates at completion |  | $ (72,000,000) | $ (132,000,000) |

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- Definition Cumulative provision for contract losses not offset against related costs accumulated on the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=51671739&loc=d3e57777-111642 + Details
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