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Operating Information by Segment and Geographic Area - Subcontracts (Details) $ in Millions | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) subcontract
--- | --- | ---
Westinghouse |  |
Segment reporting information |  |
Subcontracts with Westinghouse Electric Company | subcontract |  | 2
V.C. Summer |  |
Segment reporting information |  |
Services provided | $ 66 |
Plant Vogtle |  |
Segment reporting information |  |
Services provided |  | $ 2

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