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v3.25.3

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

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