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Revenues Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 19,736 | $ 19,353 | $ 19,428
Time-and-materials Contract [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 8,926 | 8,888 | 9,179
Fixed-price Contract [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 9,028 | 8,664 | 8,299
Transaction Or Volume-Based [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,782 | 1,801 | 1,950
North America [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 14,698 | 14,263 | 14,435
United Kingdom [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,827 | 1,885 | 1,810
Europe, excluding United Kingdom [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,932 | 1,909 | 1,795
Europe [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3,759 | 3,794 | 3,605
Rest of World [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,279 | 1,296 | 1,388
Consulting And Technology Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 12,492 | 11,964 | 12,225
Outsourcing Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 7,244 | 7,389 | 7,203
Financial Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 5,753 | 5,809 | 6,072
Financial Services | Time-and-materials Contract [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3,188 | 3,215 | 3,516
Financial Services | Fixed-price Contract [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,384 | 2,369 | 2,265
Financial Services | Transaction Or Volume-Based [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 181 | 225 | 291
Financial Services | North America [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 4,075 | 4,091 | 4,312
Financial Services | United Kingdom [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 572 | 613 | 599
Financial Services | Europe, excluding United Kingdom [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 613 | 605 | 590
Financial Services | Europe [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,185 | 1,218 | 1,189
Financial Services | Rest of World [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 493 | 500 | 571
Financial Services | Consulting And Technology Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 4,022 | 3,965 | 4,207
Financial Services | Outsourcing Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,731 | 1,844 | 1,865
Health Sciences |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 5,932 | 5,674 | 5,631
Health Sciences | Time-and-materials Contract [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,968 | 2,004 | 2,010
Health Sciences | Fixed-price Contract [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,878 | 2,600 | 2,471
Health Sciences | Transaction Or Volume-Based [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,086 | 1,070 | 1,150
Health Sciences | North America [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 5,072 | 4,865 | 4,853
Health Sciences | United Kingdom [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 186 | 167 | 171
Health Sciences | Europe, excluding United Kingdom [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 559 | 533 | 483
Health Sciences | Europe [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 745 | 700 | 654
Health Sciences | Rest of World [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 115 | 109 | 124
Health Sciences | Consulting And Technology Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3,456 | 3,238 | 3,226
Health Sciences | Outsourcing Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,476 | 2,436 | 2,405
Products and Resources |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 4,782 | 4,628 | 4,566
Products and Resources | Time-and-materials Contract [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,995 | 1,837 | 1,856
Products and Resources | Fixed-price Contract [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,442 | 2,435 | 2,357
Products and Resources | Transaction Or Volume-Based [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 345 | 356 | 353
Products and Resources | North America [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3,272 | 3,102 | 3,078
Products and Resources | United Kingdom [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 558 | 534 | 521
Products and Resources | Europe, excluding United Kingdom [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 605 | 612 | 585
Products and Resources | Europe [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,163 | 1,146 | 1,106
Products and Resources | Rest of World [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 347 | 380 | 382
Products and Resources | Consulting And Technology Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3,193 | 3,010 | 3,017
Products and Resources | Outsourcing Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,589 | 1,618 | 1,549
Communications, Media and Technology |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3,269 | 3,242 | 3,159
Communications, Media and Technology | Time-and-materials Contract [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,775 | 1,832 | 1,797
Communications, Media and Technology | Fixed-price Contract [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,324 | 1,260 | 1,206
Communications, Media and Technology | Transaction Or Volume-Based [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 170 | 150 | 156
Communications, Media and Technology | North America [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,279 | 2,205 | 2,192
Communications, Media and Technology | United Kingdom [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 511 | 571 | 519
Communications, Media and Technology | Europe, excluding United Kingdom [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 155 | 159 | 137
Communications, Media and Technology | Europe [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 666 | 730 | 656
Communications, Media and Technology | Rest of World [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 324 | 307 | 311
Communications, Media and Technology | Consulting And Technology Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,821 | 1,751 | 1,775
Communications, Media and Technology | Outsourcing Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 1,448 | $ 1,491 | $ 1,384

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