Goodwill and Other Intangible Assets (Other Intangible Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Amortized intangible assets:
Other intangible assets, gross	$ 1,773	$ 1,266
Other intangible assets, accumulated amortization	481	397
Other intangible assets, net	1,292	869
Patents, Trademarks, and Trade Names [Member]
Amortized intangible assets:
Other intangible assets, gross	465	382
Other intangible assets, accumulated amortization	203	188
Other intangible assets, net	262	194
Customer Lists and Other [Member]
Amortized intangible assets:
Other intangible assets, gross	1,308	884
Other intangible assets, accumulated amortization	278	209
Other intangible assets, net	$ 1,030	$ 675