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Operations by Business Segment and Geographic Area - Additional Operating Information (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2014 USD ($) | Dec. 31, 2017 USD ($) item $ / shares | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares
Westinghouse |  |  |  |
Segment reporting information |  |  |  |
Number of subcontracts | item |  | 2 |  |
V.C. Summer |  |  |  |
Segment reporting information |  |  |  |
Accounts receivable |  | $ 66 |  |
Plant Vogtle |  |  |  |
Segment reporting information |  |  |  |
Accounts receivable |  | 2 |  |
Nu Scale Power | Cost-sharing agreement, research and development activities |  |  |  |
Segment reporting information |  |  |  |
Qualified expenses reimbursed | $ 217 |  |  |
Energy & Chemicals |  |  |  |
Segment reporting information |  |  |  |
Effect of forecast revision on estimated project cost |  | $ 44 |  |
Effect of forecast revision on estimated project cost, in dollars per diluted share | $ / shares |  | $ 0.20 |  |
Mining, Industrial, Infrastructure & Power | Forecast revisions for gas-fired power plant in Brunswick County, Virginia |  |  |  |
Segment reporting information |  |  |  |
Loss |  |  |  | $ 60
Loss per diluted share (in dollars per share) | $ / shares |  |  |  | $ 0.26
U.S. | Energy & Chemicals |  |  |  |
Segment reporting information |  |  |  |
Effect of forecast revision on estimated project cost |  | $ 260 | $ 265 |
Effect of forecast revision on estimated project cost, in dollars per diluted share | $ / shares |  |  | $ 1.20 |
U.S. | Mining, Industrial, Infrastructure & Power |  |  |  |
Segment reporting information |  |  |  |
Effect of forecast revision on estimated project cost |  | $ 260 |  |
Effect of forecast revision on estimated project cost, in dollars per diluted share | $ / shares |  | $ 1.18 |  |
Reportable segments | Mining, Industrial, Infrastructure & Power | Nu Scale Power |  |  |  |
Segment reporting information |  |  |  |
Research and development expense |  | $ 76 | $ 92 | $ 80
Reportable segments | Mining, Industrial, Infrastructure & Power | Nu Scale Power | Cost-sharing agreement, research and development activities | U.S. Department of Energy | Total cost of revenue |  |  |  |
Segment reporting information |  |  |  |
Qualified expenses reimbursed |  | $ 48 | $ 57 | $ 65

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