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Segment Information (Narrative) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Ten Largest Customers | Revenue Benchmark | Customer Concentration Risk |  |  |
Revenue | 75.00% | 57.00% | 71.00%
Synatom | Revenue Benchmark | Customer Concentration Risk |  |  |
Revenue | 13.00% | 12.00% | 14.00%
Kyushu Electric Power | Revenue Benchmark | Customer Concentration Risk |  |  |
Revenue | 15.00% | 12.00% |
Energy Harbor Nuclear Corporation | Revenue Benchmark | Customer Concentration Risk |  |  |
Revenue |  |  | 13.00%
Dominion Energy South Carolina | Revenue Benchmark | Customer Concentration Risk |  |  |
Revenue |  |  | 10.00%
Technical Solutions Segment [Member] |  |  |
Revenue from first customer over 10 percent | 20.00% | 38.00% | 21.00%

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