intangible Assets (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 4,796	$ 4,904	$ 4,603
Other intangible assets	887	820
Intangible assets subject to amortization	789	717
Intangible assets not subject to amortization	98	103
Amortization of Intangible Assets	$ 171	$ 108	$ 95