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Revenues and Trade Accounts Receivable - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 5,415 | $ 5,044 | $ 15,775 | $ 14,654
Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,370 | 2,282 | 6,946 | 6,671
Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,547 | 2,300 | 7,370 | 6,669
Transaction or volume-based |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 498 | 462 | 1,459 | 1,314
North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 4,028 | 3,735 | 11,794 | 10,876
United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 503 | 482 | 1,442 | 1,382
Europe, excluding United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 539 | 485 | 1,552 | 1,438
Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,042 | 967 | 2,994 | 2,820
Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 345 | 342 | 987 | 958
Consulting And Technology Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 3,494 | 3,226 | 10,109 | 9,255
Outsourcing Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,921 | 1,818 | 5,666 | 5,399
Healthcare Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,604 | 1,514 | 4,726 | 4,391
Healthcare Segment | Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 506 | 499 | 1,482 | 1,486
Healthcare Segment | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 791 | 738 | 2,332 | 2,111
Healthcare Segment | Transaction or volume-based |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 307 | 277 | 912 | 794
Healthcare Segment | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,331 | 1,295 | 3,959 | 3,756
Healthcare Segment | United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 56 | 47 | 156 | 138
Healthcare Segment | Europe, excluding United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 174 | 143 | 500 | 413
Healthcare Segment | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 230 | 190 | 656 | 551
Healthcare Segment | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 43 | 29 | 111 | 84
Healthcare Segment | Consulting And Technology Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 929 | 895 | 2,707 | 2,560
Healthcare Segment | Outsourcing Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 675 | 619 | 2,019 | 1,831
Financial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,578 | 1,486 | 4,587 | 4,318
Financial Services | Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 829 | 833 | 2,405 | 2,421
Financial Services | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 697 | 608 | 2,035 | 1,761
Financial Services | Transaction or volume-based |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 52 | 45 | 147 | 136
Financial Services | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,115 | 1,048 | 3,254 | 3,064
Financial Services | United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 166 | 147 | 478 | 428
Financial Services | Europe, excluding United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 164 | 156 | 471 | 457
Financial Services | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 330 | 303 | 949 | 885
Financial Services | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 133 | 135 | 384 | 369
Financial Services | Consulting And Technology Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,118 | 1,051 | 3,237 | 3,025
Financial Services | Outsourcing Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 460 | 435 | 1,350 | 1,293
Products and Resources |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,383 | 1,228 | 3,967 | 3,487
Products and Resources | Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 589 | 511 | 1,725 | 1,428
Products and Resources | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 704 | 627 | 1,976 | 1,803
Products and Resources | Transaction or volume-based |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 90 | 90 | 266 | 256
Products and Resources | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 978 | 828 | 2,807 | 2,362
Products and Resources | United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 156 | 157 | 441 | 415
Products and Resources | Europe, excluding United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 167 | 154 | 479 | 447
Products and Resources | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 323 | 311 | 920 | 862
Products and Resources | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 82 | 89 | 240 | 263
Products and Resources | Consulting And Technology Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 981 | 833 | 2,786 | 2,297
Products and Resources | Outsourcing Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 402 | 395 | 1,181 | 1,190
Communication, Media and Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 850 | 816 | 2,495 | 2,458
Communication, Media and Technology | Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 446 | 439 | 1,334 | 1,336
Communication, Media and Technology | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 355 | 327 | 1,027 | 994
Communication, Media and Technology | Transaction or volume-based |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 49 | 50 | 134 | 128
Communication, Media and Technology | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 604 | 564 | 1,774 | 1,694
Communication, Media and Technology | United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 125 | 131 | 367 | 401
Communication, Media and Technology | Europe, excluding United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 34 | 32 | 102 | 121
Communication, Media and Technology | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 159 | 163 | 469 | 522
Communication, Media and Technology | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 87 | 89 | 252 | 242
Communication, Media and Technology | Consulting And Technology Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 466 | 447 | 1,379 | 1,373
Communication, Media and Technology | Outsourcing Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 384 | $ 369 | $ 1,116 | $ 1,085

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