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Revenues Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
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