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Segment Information - Revenue (Net of Reimbursable Expenses) of the Reported Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Total revenue $ 2,288 $ 2,289 $ 6,772 $ 6,895
Depreciation     167 176
Income/(loss) from operations 418 (766) 1,218 (274)
HWC [Member]        
Segment Reporting Information [Line Items]        
Total revenue 1,277 1,345 3,657 3,973
R&B [Member]        
Segment Reporting Information [Line Items]        
Total revenue 1,010 943 3,090 2,906
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Segment revenue excluding interest income 2,232 2,231 6,592 6,709
Interest income 36 37 95 112
Total revenue 2,268 2,268 6,687 6,821
Other segment expense 1,677 1,726 4,974 5,177
Depreciation 41 43 124 128
Total segment expense 1,718 1,769 5,098 5,305
Income/(loss) from operations 550 499 1,589 1,516
Operating Segments [Member] | HWC [Member]        
Segment Reporting Information [Line Items]        
Segment revenue excluding interest income 1,253 1,320 3,584 3,898
Interest income 8 8 22 26
Total revenue 1,261 1,328 3,606 3,924
Other segment expense 869 968 2,560 2,890
Depreciation 31 31 94 93
Total segment expense 900 999 2,654 2,983
Income/(loss) from operations 361 329 952 941
Operating Segments [Member] | R&B [Member]        
Segment Reporting Information [Line Items]        
Segment revenue excluding interest income 979 911 3,008 2,811
Interest income 28 29 73 86
Total revenue 1,007 940 3,081 2,897
Other segment expense 808 758 2,414 2,287
Depreciation 10 12 30 35
Total segment expense 818 770 2,444 2,322
Income/(loss) from operations $ 189 $ 170 $ 637 $ 575