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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