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Revenues and Trade Accounts Receivable - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 5,044 | $ 4,897 | $ 14,654 | $ 14,595
Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,282 | 2,261 | 6,671 | 6,784
Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,300 | 2,189 | 6,669 | 6,442
Transaction or volume-based |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 462 | 447 | 1,314 | 1,369
North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 3,735 | 3,599 | 10,876 | 10,733
United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 482 | 486 | 1,382 | 1,437
Europe, excluding United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 485 | 484 | 1,438 | 1,439
Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 967 | 970 | 2,820 | 2,876
Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 342 | 328 | 958 | 986
Consulting And Technology Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 3,226 | 3,022 | 9,255 | 9,035
Outsourcing Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,818 | 1,875 | 5,399 | 5,560
Financial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,486 | 1,475 | 4,318 | 4,414
Financial Services | Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 833 | 806 | 2,421 | 2,478
Financial Services | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 608 | 611 | 1,761 | 1,764
Financial Services | Transaction or volume-based |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 45 | 58 | 136 | 172
Financial Services | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,048 | 1,040 | 3,064 | 3,100
Financial Services | United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 147 | 156 | 428 | 473
Financial Services | Europe, excluding United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 156 | 151 | 457 | 458
Financial Services | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 303 | 307 | 885 | 931
Financial Services | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 135 | 128 | 369 | 383
Financial Services | Consulting And Technology Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,051 | 1,013 | 3,025 | 3,019
Financial Services | Outsourcing Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 435 | 462 | 1,293 | 1,395
Products and Resources |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,228 | 1,170 | 3,487 | 3,465
Products and Resources | Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 511 | 471 | 1,428 | 1,391
Products and Resources | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 627 | 610 | 1,803 | 1,807
Products and Resources | Transaction or volume-based |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 90 | 89 | 256 | 267
Products and Resources | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 828 | 785 | 2,362 | 2,306
Products and Resources | United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 157 | 137 | 415 | 406
Products and Resources | Europe, excluding United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 154 | 153 | 447 | 463
Products and Resources | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 311 | 290 | 862 | 869
Products and Resources | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 89 | 95 | 263 | 290
Products and Resources | Consulting And Technology Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 833 | 763 | 2,297 | 2,258
Products and Resources | Outsourcing Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 395 | 407 | 1,190 | 1,207
Communication, Media and Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 816 | 847 | 2,458 | 2,438
Communication, Media and Technology | Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 439 | 471 | 1,336 | 1,395
Communication, Media and Technology | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 327 | 328 | 994 | 926
Communication, Media and Technology | Transaction or volume-based |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 50 | 48 | 128 | 117
Communication, Media and Technology | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 564 | 580 | 1,694 | 1,652
Communication, Media and Technology | United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 131 | 150 | 401 | 434
Communication, Media and Technology | Europe, excluding United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 32 | 41 | 121 | 120
Communication, Media and Technology | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 163 | 191 | 522 | 554
Communication, Media and Technology | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 89 | 76 | 242 | 232
Communication, Media and Technology | Consulting And Technology Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 447 | 440 | 1,373 | 1,318
Communication, Media and Technology | Outsourcing Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 369 | 407 | 1,085 | 1,120
Healthcare Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,514 | 1,405 | 4,391 | 4,278
Healthcare Segment | Time-and-materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 499 | 513 | 1,486 | 1,520
Healthcare Segment | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 738 | 640 | 2,111 | 1,945
Healthcare Segment | Transaction or volume-based |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 277 | 252 | 794 | 813
Healthcare Segment | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,295 | 1,194 | 3,756 | 3,675
Healthcare Segment | United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 47 | 43 | 138 | 124
Healthcare Segment | Europe, excluding United Kingdom |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 143 | 139 | 413 | 398
Healthcare Segment | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 190 | 182 | 551 | 522
Healthcare Segment | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 29 | 29 | 84 | 81
Healthcare Segment | Consulting And Technology Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 895 | 806 | 2,560 | 2,440
Healthcare Segment | Outsourcing Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 619 | $ 599 | $ 1,831 | $ 1,838

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