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Revenues and Trade Accounts Receivable - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 5,245	$ 4,850	$ 10,360	$ 9,610
Time-and-materials
Disaggregation of Revenue [Line Items]
Revenue	2,341	2,179	4,576	4,389
Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	2,413	2,233	4,823	4,369
Transaction or volume-based
Disaggregation of Revenue [Line Items]
Revenue	491	438	961	852
North America
Disaggregation of Revenue [Line Items]
Revenue	3,912	3,620	7,766	7,141
United Kingdom
Disaggregation of Revenue [Line Items]
Revenue	482	444	939	900
Europe, excluding United Kingdom
Disaggregation of Revenue [Line Items]
Revenue	520	470	1,013	953
Europe
Disaggregation of Revenue [Line Items]
Revenue	1,002	914	1,952	1,853
Rest of World
Disaggregation of Revenue [Line Items]
Revenue	331	316	642	616
Consulting And Technology Services
Disaggregation of Revenue [Line Items]
Revenue	3,389	3,074	6,615	6,029
Outsourcing Services
Disaggregation of Revenue [Line Items]
Revenue	1,856	1,776	3,745	3,581
Healthcare Segment
Disaggregation of Revenue [Line Items]
Revenue	1,551	1,461	3,122	2,877
Healthcare Segment | Time-and-materials
Disaggregation of Revenue [Line Items]
Revenue	495	497	976	987
Healthcare Segment | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	750	703	1,541	1,373
Healthcare Segment | Transaction or volume-based
Disaggregation of Revenue [Line Items]
Revenue	306	261	605	517
Healthcare Segment | North America
Disaggregation of Revenue [Line Items]
Revenue	1,298	1,252	2,628	2,461
Healthcare Segment | United Kingdom
Disaggregation of Revenue [Line Items]
Revenue	51	47	100	91
Healthcare Segment | Europe, excluding United Kingdom
Disaggregation of Revenue [Line Items]
Revenue	166	135	326	270
Healthcare Segment | Europe
Disaggregation of Revenue [Line Items]
Revenue	217	182	426	361
Healthcare Segment | Rest of World
Disaggregation of Revenue [Line Items]
Revenue	36	27	68	55
Healthcare Segment | Consulting And Technology Services
Disaggregation of Revenue [Line Items]
Revenue	908	863	1,778	1,665
Healthcare Segment | Outsourcing Services
Disaggregation of Revenue [Line Items]
Revenue	643	598	1,344	1,212
Financial Services
Disaggregation of Revenue [Line Items]
Revenue	1,547	1,447	3,009	2,832
Financial Services | Time-and-materials
Disaggregation of Revenue [Line Items]
Revenue	812	805	1,576	1,588
Financial Services | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	687	597	1,338	1,153
Financial Services | Transaction or volume-based
Disaggregation of Revenue [Line Items]
Revenue	48	45	95	91
Financial Services | North America
Disaggregation of Revenue [Line Items]
Revenue	1,096	1,039	2,139	2,016
Financial Services | United Kingdom
Disaggregation of Revenue [Line Items]
Revenue	159	138	312	281
Financial Services | Europe, excluding United Kingdom
Disaggregation of Revenue [Line Items]
Revenue	160	150	307	301
Financial Services | Europe
Disaggregation of Revenue [Line Items]
Revenue	319	288	619	582
Financial Services | Rest of World
Disaggregation of Revenue [Line Items]
Revenue	132	120	251	234
Financial Services | Consulting And Technology Services
Disaggregation of Revenue [Line Items]
Revenue	1,099	1,021	2,119	1,974
Financial Services | Outsourcing Services
Disaggregation of Revenue [Line Items]
Revenue	448	426	890	858
Products and Resources
Disaggregation of Revenue [Line Items]
Revenue	1,306	1,126	2,584	2,259
Products and Resources | Time-and-materials
Disaggregation of Revenue [Line Items]
Revenue	580	447	1,136	917
Products and Resources | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	638	594	1,272	1,176
Products and Resources | Transaction or volume-based
Disaggregation of Revenue [Line Items]
Revenue	88	85	176	166
Products and Resources | North America
Disaggregation of Revenue [Line Items]
Revenue	918	761	1,829	1,534
Products and Resources | United Kingdom
Disaggregation of Revenue [Line Items]
Revenue	148	127	285	258
Products and Resources | Europe, excluding United Kingdom
Disaggregation of Revenue [Line Items]
Revenue	159	148	312	293
Products and Resources | Europe
Disaggregation of Revenue [Line Items]
Revenue	307	275	597	551
Products and Resources | Rest of World
Disaggregation of Revenue [Line Items]
Revenue	81	90	158	174
Products and Resources | Consulting And Technology Services
Disaggregation of Revenue [Line Items]
Revenue	918	728	1,805	1,464
Products and Resources | Outsourcing Services
Disaggregation of Revenue [Line Items]
Revenue	388	398	779	795
Communication, Media and Technology
Disaggregation of Revenue [Line Items]
Revenue	841	816	1,645	1,642
Communication, Media and Technology | Time-and-materials
Disaggregation of Revenue [Line Items]
Revenue	454	430	888	897
Communication, Media and Technology | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	338	339	672	667
Communication, Media and Technology | Transaction or volume-based
Disaggregation of Revenue [Line Items]
Revenue	49	47	85	78
Communication, Media and Technology | North America
Disaggregation of Revenue [Line Items]
Revenue	600	568	1,170	1,130
Communication, Media and Technology | United Kingdom
Disaggregation of Revenue [Line Items]
Revenue	124	132	242	270
Communication, Media and Technology | Europe, excluding United Kingdom
Disaggregation of Revenue [Line Items]
Revenue	35	37	68	89
Communication, Media and Technology | Europe
Disaggregation of Revenue [Line Items]
Revenue	159	169	310	359
Communication, Media and Technology | Rest of World
Disaggregation of Revenue [Line Items]
Revenue	82	79	165	153
Communication, Media and Technology | Consulting And Technology Services
Disaggregation of Revenue [Line Items]
Revenue	464	462	913	926
Communication, Media and Technology | Outsourcing Services
Disaggregation of Revenue [Line Items]
Revenue	$ 377	$ 354	$ 732	$ 716

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