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Segment Information - Revenue (Net of Reimbursable Expenses) of the Reported Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]        
Total revenue $ 2,261 $ 2,265 $ 4,484 $ 4,606
Depreciation     111 116
Income from operations 368 212 800 492
HWC [Member]        
Segment Reporting Information [Line Items]        
Total revenue 1,198 1,275 2,380 2,628
R&B [Member]        
Segment Reporting Information [Line Items]        
Total revenue 1,050 982 2,080 1,963
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Segment revenue excluding interest income 2,197 2,201 4,360 4,478
Interest income 30 38 59 75
Total revenue 2,227 2,239 4,419 4,553
Other segment expense 1,683 1,719 3,297 3,451
Depreciation 42 42 83 85
Total segment expense 1,725 1,761 3,380 3,536
Income from operations 502 478 1,039 1,017
Operating Segments [Member] | HWC [Member]        
Segment Reporting Information [Line Items]        
Segment revenue excluding interest income 1,173 1,251 2,331 2,578
Interest income 7 9 14 18
Total revenue 1,180 1,260 2,345 2,596
Other segment expense 868 953 1,691 1,922
Depreciation 32 31 63 62
Total segment expense 900 984 1,754 1,984
Income from operations 280 276 591 612
Operating Segments [Member] | R&B [Member]        
Segment Reporting Information [Line Items]        
Segment revenue excluding interest income 1,024 950 2,029 1,900
Interest income 23 29 45 57
Total revenue 1,047 979 2,074 1,957
Other segment expense 815 766 1,606 1,529
Depreciation 10 11 20 23
Total segment expense 825 777 1,626 1,552
Income from operations $ 222 $ 202 $ 448 $ 405