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Revenues and Trade Accounts Receivable - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 5,115 | $ 4,760
Time-and-materials |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,235 | 2,210
Fixed-price |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,410 | 2,136
Transaction or volume-based |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 470 | 414
North America |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 3,854 | 3,521
United Kingdom |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 457 | 456
Europe, excluding United Kingdom |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 493 | 483
Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 950 | 939
Rest of World |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 311 | 300
Consulting And Technology Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 3,226 | 2,955
Outsourcing Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,889 | 1,805
Healthcare Segment |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,571 | 1,416
Healthcare Segment | Time-and-materials |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 481 | 490
Healthcare Segment | Fixed-price |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 791 | 670
Healthcare Segment | Transaction or volume-based |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 299 | 256
Healthcare Segment | North America |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,330 | 1,209
Healthcare Segment | United Kingdom |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 49 | 44
Healthcare Segment | Europe, excluding United Kingdom |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 160 | 135
Healthcare Segment | Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 209 | 179
Healthcare Segment | Rest of World |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 32 | 28
Healthcare Segment | Consulting And Technology Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 870 | 802
Healthcare Segment | Outsourcing Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 701 | 614
Financial Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,462 | 1,385
Financial Services | Time-and-materials |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 764 | 783
Financial Services | Fixed-price |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 651 | 556
Financial Services | Transaction or volume-based |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 47 | 46
Financial Services | North America |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,043 | 977
Financial Services | United Kingdom |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 153 | 143
Financial Services | Europe, excluding United Kingdom |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 147 | 151
Financial Services | Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 300 | 294
Financial Services | Rest of World |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 119 | 114
Financial Services | Consulting And Technology Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,020 | 953
Financial Services | Outsourcing Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 442 | 432
Products and Resources |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,278 | 1,133
Products and Resources | Time-and-materials |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 556 | 470
Products and Resources | Fixed-price |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 634 | 582
Products and Resources | Transaction or volume-based |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 88 | 81
Products and Resources | North America |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 911 | 773
Products and Resources | United Kingdom |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 137 | 131
Products and Resources | Europe, excluding United Kingdom |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 153 | 145
Products and Resources | Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 290 | 276
Products and Resources | Rest of World |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 77 | 84
Products and Resources | Consulting And Technology Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 887 | 736
Products and Resources | Outsourcing Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 391 | 397
Communication, Media and Technology |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 804 | 826
Communication, Media and Technology | Time-and-materials |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 434 | 467
Communication, Media and Technology | Fixed-price |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 334 | 328
Communication, Media and Technology | Transaction or volume-based |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 36 | 31
Communication, Media and Technology | North America |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 570 | 562
Communication, Media and Technology | United Kingdom |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 118 | 138
Communication, Media and Technology | Europe, excluding United Kingdom |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 33 | 52
Communication, Media and Technology | Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 151 | 190
Communication, Media and Technology | Rest of World |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 83 | 74
Communication, Media and Technology | Consulting And Technology Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 449 | 464
Communication, Media and Technology | Outsourcing Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 355 | $ 362

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