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Revenue - Disaggregated Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Disaggregation of Revenue [Line Items]        
Revenue $ 977 $ 1,038 $ 2,872 $ 3,092
Point in time        
Disaggregation of Revenue [Line Items]        
Revenue 37 26 82 83
Over time        
Disaggregation of Revenue [Line Items]        
Revenue 940 1,012 2,790 3,009
Commercial:        
Disaggregation of Revenue [Line Items]        
Revenue 504 493 1,486 1,493
Government Services:        
Disaggregation of Revenue [Line Items]        
Revenue 291 346 856 996
Transportation:        
Disaggregation of Revenue [Line Items]        
Revenue 182 180 523 549
Other | Divestitures        
Disaggregation of Revenue [Line Items]        
Revenue 0 19 7 54
Customer experience management | Commercial:        
Disaggregation of Revenue [Line Items]        
Revenue 162 152 468 459
Business operations solutions | Commercial:        
Disaggregation of Revenue [Line Items]        
Revenue 138 139 415 418
Commercial healthcare solutions | Commercial:        
Disaggregation of Revenue [Line Items]        
Revenue 100 91 278 277
Human resource and learning services | Commercial:        
Disaggregation of Revenue [Line Items]        
Revenue 104 111 325 339
Government healthcare solutions | Government Services:        
Disaggregation of Revenue [Line Items]        
Revenue 150 143 438 432
Government services solutions | Government Services:        
Disaggregation of Revenue [Line Items]        
Revenue 141 203 418 564
Roadway charging & management services | Transportation:        
Disaggregation of Revenue [Line Items]        
Revenue 87 79 244 237
Transit solutions | Transportation:        
Disaggregation of Revenue [Line Items]        
Revenue 55 60 161 194
Curbside management solutions | Transportation:        
Disaggregation of Revenue [Line Items]        
Revenue 22 22 63 60
Public safety solutions | Transportation:        
Disaggregation of Revenue [Line Items]        
Revenue 16 17 49 52
Commercial vehicles | Transportation:        
Disaggregation of Revenue [Line Items]        
Revenue $ 2 $ 2 $ 6 $ 6