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Goodwill and Intangible Assets (Summary of Goodwill by Reportable Segments) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Roll Forward] |  |  |  |
Balance, Beginning of period | $ 1,265,000,000 | $ 1,761,000,000 | $ 1,265,000,000 |
Goodwill acquired during the period (Note 4) |  | 306,000,000 | 589,000,000 |
Goodwill reallocation |  |  | 0 |
Impairment loss | (62,000,000) | 0 | (99,000,000) | $ 0
Foreign currency translation |  | (7,000,000) | 6,000,000 |
Balance, End of period |  | 2,060,000,000 | 1,761,000,000 | 1,265,000,000
Government Solutions |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Balance, Beginning of period | 978,000,000 | 1,589,000,000 | 978,000,000 |
Goodwill acquired during the period (Note 4) |  | 306,000,000 | 589,000,000 |
Goodwill reallocation |  |  | 19,000,000 |
Impairment loss |  |  | 0 |
Foreign currency translation |  | (5,000,000) | 3,000,000 |
Balance, End of period |  | 1,890,000,000 | 1,589,000,000 | 978,000,000
Sustainable Technology Solutions |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Balance, Beginning of period | $ 287,000,000 | 172,000,000 | 287,000,000 |
Goodwill acquired during the period (Note 4) |  | 0 | 0 |
Goodwill reallocation |  |  | (19,000,000) |
Impairment loss |  |  | (99,000,000) |
Foreign currency translation |  | (2,000,000) | 3,000,000 |
Balance, End of period |  | $ 170,000,000 | $ 172,000,000 | $ 287,000,000

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