Goodwill and Other Intangible Assets, net (Other Intangible Assets Disclosure) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Indefinite-lived intangible assets	$ 12,125	$ 11,740
Definite-lived intangible assets	465	465
Total other intangible assets	12,590	12,205
Definite-lived intangible assets, accumulated amortization	$ 190	$ 169