Goodwill and Other Intangibles (Other Intangibles Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets, foreign currency translation gain	$ 42
Intangible amortization	$ 79	$ 71	$ 74