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Revenue (Revenue by Geographic Destination) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 1,536 | $ 1,385 | $ 2,997 | $ 2,922
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 913 | 719 | 1,775 | 1,481
Middle East |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 197 | 230 | 374 | 481
Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 222 | 197 | 439 | 446
Australia |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 90 | 79 | 171 | 166
Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1 | 5 | 1 | 31
Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 43 | 33 | 82 | 75
Asia |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 52 | 56 | 103 | 124
Other countries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 18 | 66 | 52 | 118
Government Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,231 | 953 | 2,395 | 1,935
Government Solutions | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 804 | 521 | 1,553 | 1,034
Government Solutions | Middle East |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 143 | 171 | 276 | 358
Government Solutions | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 161 | 159 | 334 | 349
Government Solutions | Australia |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 90 | 68 | 167 | 126
Government Solutions | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Government Solutions | Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 19 | 19 | 38 | 38
Government Solutions | Asia |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1 | 0 | 1 | 0
Government Solutions | Other countries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 13 | 15 | 26 | 30
Sustainable Technology Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 305 | 432 | 602 | 987
Sustainable Technology Solutions | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 109 | 198 | 222 | 447
Sustainable Technology Solutions | Middle East |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 54 | 59 | 98 | 123
Sustainable Technology Solutions | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 61 | 38 | 105 | 97
Sustainable Technology Solutions | Australia |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 11 | 4 | 40
Sustainable Technology Solutions | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1 | 5 | 1 | 31
Sustainable Technology Solutions | Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 24 | 14 | 44 | 37
Sustainable Technology Solutions | Asia |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 51 | 56 | 102 | 124
Sustainable Technology Solutions | Other countries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5 | 51 | 26 | 88
Science & Space | Government Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 261 | 241 | 508 | 478
Defense & Intel | Government Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 395 | 207 | 746 | 412
Readiness & Sustainment | Government Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 315 | 269 | 644 | 555
International | Government Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 260 | $ 236 | $ 497 | $ 490

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