Intangible Assets - Schedule of Intangible Assets by Class (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 21,902	$ 21,685
Accumulated Amortization	10,463	9,270
Net Book Value	11,439	12,415
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	14,607	14,795
Accumulated Amortization	7,307	6,371
Net Book Value	7,300	8,424
Acquired software and technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,354	2,510
Accumulated Amortization	1,301	1,234
Net Book Value	1,053	1,276
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	634	633
Accumulated Amortization	339	295
Net Book Value	295	338
Purchased software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,113	1,146
Accumulated Amortization	505	595
Net Book Value	608	551
Capitalized software and other intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,194	2,601
Accumulated Amortization	1,011	775
Net Book Value	$ 2,183	$ 1,826