Goodwill and Other Intangible Assets, net (Other Intangible Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Non-amortizable intangible assets	$ 1,323	$ 1,455
Amortizable intangible assets, gross carrying amount	1,798	1,598
Accumulated Amortization	689	583
Total other intangible assets	$ 3,121	$ 3,053