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Revenue - Disaggregated Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue [Line Items]        
Revenue $ 767 $ 807 $ 2,272 $ 2,556
Point in time        
Disaggregation of Revenue [Line Items]        
Revenue 31 24 78 80
Over time        
Disaggregation of Revenue [Line Items]        
Revenue 736 783 2,194 2,476
Commercial:        
Disaggregation of Revenue [Line Items]        
Revenue 367 385 1,134 1,192
Commercial: | Customer Experience Management        
Disaggregation of Revenue [Line Items]        
Revenue 122 125 388 404
Commercial: | BPaaS        
Disaggregation of Revenue [Line Items]        
Revenue 117 125 349 377
Commercial: | Integrated Digital Solutions        
Disaggregation of Revenue [Line Items]        
Revenue 128 135 397 411
Government:        
Disaggregation of Revenue [Line Items]        
Revenue 238 255 692 758
Government: | Government Healthcare Solutions        
Disaggregation of Revenue [Line Items]        
Revenue 132 137 395 427
Government: | Government Services Solutions        
Disaggregation of Revenue [Line Items]        
Revenue 106 118 297 331
Transportation:        
Disaggregation of Revenue [Line Items]        
Revenue 162 141 446 426
Transportation: | Road Usage Charging & Management Solutions        
Disaggregation of Revenue [Line Items]        
Revenue 60 58 184 185
Transportation: | Transit Solutions        
Disaggregation of Revenue [Line Items]        
Revenue 102 83 262 240
Transportation: | Commercial Vehicles        
Disaggregation of Revenue [Line Items]        
Revenue 0 0 0 1
Other | Divestitures        
Disaggregation of Revenue [Line Items]        
Revenue $ 0 $ 26 $ 0 $ 180