Goodwill and Intangible Assets - Schedule of Intangible Assets by Type (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets, gross	$ 6,022	$ 6,276
Finite-lived intangible assets, accumulated amortization	(2,525)	(2,115)
Finite-lived intangible assets, net	3,497	4,161
Indefinite-lived intangible assets	2,222	2,197
Intangible assets, gross	8,244	8,473
Other intangible assets, net	5,719	6,358
Technology
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets, gross	1,107	1,177
Finite-lived intangible assets, accumulated amortization	(526)	(440)
Finite-lived intangible assets, net	581	737
Customer relationships
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets, gross	3,085	3,202
Finite-lived intangible assets, accumulated amortization	(944)	(819)
Finite-lived intangible assets, net	2,141	2,383
Capitalized software
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets, gross	1,118	1,130
Finite-lived intangible assets, accumulated amortization	(824)	(697)
Finite-lived intangible assets, net	294	433
Trade names and trademarks
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets, gross	698	757
Finite-lived intangible assets, accumulated amortization	(229)	(159)
Finite-lived intangible assets, net	469	598
Other
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets, gross	14	10
Finite-lived intangible assets, accumulated amortization	(2)	0
Finite-lived intangible assets, net	$ 12	$ 10