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Revenues and Trade Accounts Receivable - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 5,245 | $ 4,850 | $ 10,360 | $ 9,610
Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,341 | 2,179 | 4,576 | 4,389
Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,413 | 2,233 | 4,823 | 4,369
Transaction or volume-based |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 491 | 438 | 961 | 852
North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 3,912 | 3,620 | 7,766 | 7,141
United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 482 | 444 | 939 | 900
Europe, excluding United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 520 | 470 | 1,013 | 953
Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,002 | 914 | 1,952 | 1,853
Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 331 | 316 | 642 | 616
Consulting And Technology Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 3,389 | 3,074 | 6,615 | 6,029
Outsourcing Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,856 | 1,776 | 3,745 | 3,581
Healthcare Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,551 | 1,461 | 3,122 | 2,877
Healthcare Segment | Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 495 | 497 | 976 | 987
Healthcare Segment | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 750 | 703 | 1,541 | 1,373
Healthcare Segment | Transaction or volume-based |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 306 | 261 | 605 | 517
Healthcare Segment | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,298 | 1,252 | 2,628 | 2,461
Healthcare Segment | United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 51 | 47 | 100 | 91
Healthcare Segment | Europe, excluding United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 166 | 135 | 326 | 270
Healthcare Segment | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 217 | 182 | 426 | 361
Healthcare Segment | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 36 | 27 | 68 | 55
Healthcare Segment | Consulting And Technology Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 908 | 863 | 1,778 | 1,665
Healthcare Segment | Outsourcing Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 643 | 598 | 1,344 | 1,212
Financial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,547 | 1,447 | 3,009 | 2,832
Financial Services | Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 812 | 805 | 1,576 | 1,588
Financial Services | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 687 | 597 | 1,338 | 1,153
Financial Services | Transaction or volume-based |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 48 | 45 | 95 | 91
Financial Services | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,096 | 1,039 | 2,139 | 2,016
Financial Services | United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 159 | 138 | 312 | 281
Financial Services | Europe, excluding United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 160 | 150 | 307 | 301
Financial Services | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 319 | 288 | 619 | 582
Financial Services | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 132 | 120 | 251 | 234
Financial Services | Consulting And Technology Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,099 | 1,021 | 2,119 | 1,974
Financial Services | Outsourcing Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 448 | 426 | 890 | 858
Products and Resources |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,306 | 1,126 | 2,584 | 2,259
Products and Resources | Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 580 | 447 | 1,136 | 917
Products and Resources | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 638 | 594 | 1,272 | 1,176
Products and Resources | Transaction or volume-based |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 88 | 85 | 176 | 166
Products and Resources | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 918 | 761 | 1,829 | 1,534
Products and Resources | United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 148 | 127 | 285 | 258
Products and Resources | Europe, excluding United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 159 | 148 | 312 | 293
Products and Resources | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 307 | 275 | 597 | 551
Products and Resources | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 81 | 90 | 158 | 174
Products and Resources | Consulting And Technology Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 918 | 728 | 1,805 | 1,464
Products and Resources | Outsourcing Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 388 | 398 | 779 | 795
Communication, Media and Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 841 | 816 | 1,645 | 1,642
Communication, Media and Technology | Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 454 | 430 | 888 | 897
Communication, Media and Technology | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 338 | 339 | 672 | 667
Communication, Media and Technology | Transaction or volume-based |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 49 | 47 | 85 | 78
Communication, Media and Technology | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 600 | 568 | 1,170 | 1,130
Communication, Media and Technology | United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 124 | 132 | 242 | 270
Communication, Media and Technology | Europe, excluding United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 35 | 37 | 68 | 89
Communication, Media and Technology | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 159 | 169 | 310 | 359
Communication, Media and Technology | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 82 | 79 | 165 | 153
Communication, Media and Technology | Consulting And Technology Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 464 | 462 | 913 | 926
Communication, Media and Technology | Outsourcing Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 377 | $ 354 | $ 732 | $ 716

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