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Revenues and Trade Accounts Receivable - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 5,481 | $ 5,245 | $ 10,894 | $ 10,360
Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,305 | 2,341 | 4,516 | 4,576
Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,690 | 2,413 | 5,414 | 4,823
Transaction or volume-based |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 486 | 491 | 964 | 961
North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 4,127 | 3,912 | 8,179 | 7,766
United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 492 | 482 | 1,001 | 939
Europe, excluding United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 535 | 520 | 1,065 | 1,013
Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,027 | 1,002 | 2,066 | 1,952
Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 327 | 331 | 649 | 642
Consulting And Technology Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 3,518 | 3,389 | 7,009 | 6,615
Outsourcing Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,963 | 1,856 | 3,885 | 3,745
Healthcare Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,572 | 1,551 | 3,151 | 3,122
Healthcare Segment | Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 487 | 495 | 961 | 976
Healthcare Segment | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 803 | 750 | 1,609 | 1,541
Healthcare Segment | Transaction or volume-based |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 282 | 306 | 581 | 605
Healthcare Segment | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,307 | 1,298 | 2,618 | 2,628
Healthcare Segment | United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 60 | 51 | 117 | 100
Healthcare Segment | Europe, excluding United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 164 | 166 | 332 | 326
Healthcare Segment | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 224 | 217 | 449 | 426
Healthcare Segment | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 41 | 36 | 84 | 68
Healthcare Segment | Consulting And Technology Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 925 | 908 | 1,838 | 1,778
Healthcare Segment | Outsourcing Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 647 | 643 | 1,313 | 1,344
Financial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,733 | 1,547 | 3,377 | 3,009
Financial Services | Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 848 | 812 | 1,628 | 1,576
Financial Services | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 825 | 687 | 1,633 | 1,338
Financial Services | Transaction or volume-based |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 60 | 48 | 116 | 95
Financial Services | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,263 | 1,096 | 2,439 | 2,139
Financial Services | United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 165 | 159 | 336 | 312
Financial Services | Europe, excluding United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 167 | 160 | 333 | 307
Financial Services | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 332 | 319 | 669 | 619
Financial Services | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 138 | 132 | 269 | 251
Financial Services | Consulting And Technology Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,255 | 1,099 | 2,440 | 2,119
Financial Services | Outsourcing Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 478 | 448 | 937 | 890
Products and Resources |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,322 | 1,306 | 2,643 | 2,584
Products and Resources | Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 515 | 580 | 1,038 | 1,136
Products and Resources | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 718 | 638 | 1,431 | 1,272
Products and Resources | Transaction or volume-based |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 89 | 88 | 174 | 176
Products and Resources | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 918 | 918 | 1,834 | 1,829
Products and Resources | United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 151 | 148 | 315 | 285
Products and Resources | Europe, excluding United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 171 | 159 | 332 | 312
Products and Resources | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 322 | 307 | 647 | 597
Products and Resources | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 82 | 81 | 162 | 158
Products and Resources | Consulting And Technology Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 900 | 918 | 1,801 | 1,805
Products and Resources | Outsourcing Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 422 | 388 | 842 | 779
Communications, Media and Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 854 | 841 | 1,723 | 1,645
Communications, Media and Technology | Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 455 | 454 | 889 | 888
Communications, Media and Technology | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 344 | 338 | 741 | 672
Communications, Media and Technology | Transaction or volume-based |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 55 | 49 | 93 | 85
Communications, Media and Technology | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 639 | 600 | 1,288 | 1,170
Communications, Media and Technology | United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 116 | 124 | 233 | 242
Communications, Media and Technology | Europe, excluding United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 33 | 35 | 68 | 68
Communications, Media and Technology | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 149 | 159 | 301 | 310
Communications, Media and Technology | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 66 | 82 | 134 | 165
Communications, Media and Technology | Consulting And Technology Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 438 | 464 | 930 | 913
Communications, Media and Technology | Outsourcing Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 416 | $ 377 | $ 793 | $ 732

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