Goodwill, Customer Relationships and Other Intangible Assets - Schedule of Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 7,408	$ 11,119
Customer Contracts And Relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	7,219	7,567
Accumulated amortization	1,183	833
Trade Names
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	87	100
Accumulated amortization	43	30
Patents and Developed Technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	345	310
Accumulated amortization	102	67
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 432	$ 410