v3.24.2
Segment Information - Revenue (Net of Reimbursable Expenses) of the Reported Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Segment Reporting Information [Line Items]        
Revenues $ 2,265 $ 2,159 $ 4,606 $ 4,403
Income from operations 212 142 492 427
HWC [Member]        
Segment Reporting Information [Line Items]        
Revenues 1,275 1,233 2,628 2,535
R&B [Member]        
Segment Reporting Information [Line Items]        
Revenues 982 903 1,963 1,810
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Revenues 2,239 2,115 4,553 4,306
Income from operations 478 367 1,017 856
Operating Segments [Member] | HWC [Member]        
Segment Reporting Information [Line Items]        
Revenues 1,260 1,215 2,596 2,502
Income from operations 276 222 612 531
Operating Segments [Member] | R&B [Member]        
Segment Reporting Information [Line Items]        
Revenues 979 900 1,957 1,804
Income from operations $ 202 $ 145 $ 405 $ 325