Goodwill, Customer Relationships and Other Intangible Assets - Schedule of Goodwill, Customer Relationships, and Other Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Goodwill [Line Items]
Goodwill	$ 15,947	$ 15,986
Indefinite-life intangible assets	9	9
Total other intangible assets, net	6,628	6,970
Customer relationships
Goodwill [Line Items]
Finite-lived intangible assets, net	5,002	5,365
Accumulated amortization	3,422	11,740
Capitalized software
Goodwill [Line Items]
Finite-lived intangible assets, net	1,500	1,459
Accumulated amortization	3,741	3,624
Trade names, patents and other
Goodwill [Line Items]
Finite-lived intangible assets, net	117	137
Accumulated amortization	172	$ 160
Fully amortized and retired customer relationships
Goodwill [Line Items]
Gross carrying value	$ 8,700