Goodwill and Other Intangible Assets, net (Other Intangible Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Non-amortizable intangible assets, gross carrying amount	$ 1,362	$ 1,455
Amortizable intangible assets, gross carrying amount	1,808	1,598
Total other intangible assets, gross carrying amount	3,170	3,053
Accumulated Amortization	$ 669	$ 583