Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Amortizable intangible assets:
Amortizable intangible assets, Cost	$ 3,605	$ 3,611
Amortizable intangible assets, Accumulated Amortization	(2,681)	(2,499)
Amortizable intangible assets, Net	924	1,112
Total intangible assets, Cost	3,765	3,771
Total intangible assets, Net	1,084	1,272
Trademarks and brands
Indefinite-lived intangible assets:
Indefinite-lived intangible assets	160	160
Customer lists and relationships
Amortizable intangible assets:
Amortizable intangible assets, Cost	1,747	1,753
Amortizable intangible assets, Accumulated Amortization	(1,282)	(1,182)
Amortizable intangible assets, Net	465	571
Trademarks and brands
Amortizable intangible assets:
Amortizable intangible assets, Cost	759	761
Amortizable intangible assets, Accumulated Amortization	(435)	(391)
Amortizable intangible assets, Net	324	370
Patents and proprietary technology
Amortizable intangible assets:
Amortizable intangible assets, Cost	621	623
Amortizable intangible assets, Accumulated Amortization	(506)	(473)
Amortizable intangible assets, Net	115	150
Other
Amortizable intangible assets:
Amortizable intangible assets, Cost	478	474
Amortizable intangible assets, Accumulated Amortization	(458)	(453)
Amortizable intangible assets, Net	$ 20	$ 21