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Business Segment Information (Schedule of Balance Sheet Information by Reportable Segment) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |  |
Total assets | $ 5,364 | $ 5,052 |  |
Goodwill | 1,265 | 1,265 |  | $ 968
Equity in and advances to related companies | 850 | 724 | $ 452 |
Government Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Goodwill | 978 | 977 |  | $ 679
Operating Segments | Government Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total assets | 2,749 | 2,804 |  |
Goodwill | 978 | 977 |  |
Equity in and advances to related companies | 151 | 114 |  |
Operating Segments | Technology Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total assets | 222 | 204 |  |
Goodwill | 50 | 51 |  |
Equity in and advances to related companies | 0 | 0 |  |
Operating Segments | Energy Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total assets | 1,497 | 1,271 |  |
Goodwill | 237 | 237 |  |
Equity in and advances to related companies | 699 | 610 |  |
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total assets | 889 | 746 |  |
Goodwill | 0 | 0 |  |
Equity in and advances to related companies | 0 | 0 |  |
Subtotal |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total assets | 5,357 | 5,025 |  |
Goodwill | 1,265 | 1,265 |  |
Equity in and advances to related companies | 850 | 724 |  |
Non-strategic Business |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total assets | 7 | 27 |  |
Goodwill | 0 | 0 |  |
Equity in and advances to related companies | $ 0 | $ 0 |  |

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