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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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