Goodwill and Other Intangible Assets, net (Other Intangible Assets Disclosure) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Indefinite-lived intangible assets	$ 11,846	$ 12,125
Definite-lived intangible assets	654	465
Total other intangible assets	12,500	12,590
Definite-lived intangible assets, accumulated amortization	$ 221	$ 190