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Revenue (Revenue by Product Line) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 5,639 | $ 4,913 | $ 4,171
Operating Segments | Government Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3,925 | 3,457 | 2,193
Operating Segments | Government Solutions | Space and Mission Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 874 | 651 |
Operating Segments | Government Solutions | Engineering |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,158 | 1,141 |
Operating Segments | Government Solutions | Logistics |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,893 | 1,665 |
Operating Segments | Technology Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 374 | 297 | 269
Operating Segments | Energy Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,339 | 1,157 | 1,671
Operating Segments | Energy Solutions | EPC Delivery Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 438 | 432 |
Operating Segments | Energy Solutions | Services and Consulting |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 901 | 725 |
Non-strategic Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 1 | $ 2 | $ 38

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