Intangible Assets - Schedule of Intangible Assets by Class (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 20,992	$ 21,249
Accumulated Amortization	8,536	7,240
Net Book Value	12,456	14,009
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	14,435	15,103
Accumulated Amortization	5,971	5,112
Net Book Value	8,464	9,991
Acquired software and technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,484	2,522
Accumulated Amortization	1,144	901
Net Book Value	1,340	1,621
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	628	612
Accumulated Amortization	277	228
Net Book Value	351	384
Purchased software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,111	1,133
Accumulated Amortization	534	479
Net Book Value	577	654
Capitalized software and other intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,334	1,879
Accumulated Amortization	610	520
Net Book Value	$ 1,724	$ 1,359