Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 1,800	$ 1,852
Accumulated amortization	(913)	(897)
Intangibles, net	887	955
Indefinite-lived trade names and trademarks	32	32
Total other intangible assets, gross	1,832	1,884
Total other intangible assets, net	919	987
Computer software
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	768	789
Accumulated amortization	(657)	(674)
Intangibles, net	111	115
Patents and licenses
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	110	110
Accumulated amortization	(107)	(107)
Intangibles, net	3	3
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	922	953
Accumulated amortization	(149)	(116)
Intangibles, net	$ 773	$ 837