Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets subject to amortization	$ 3,800	$ 789
Intangible assets not subject to amortization	3,000	98
Amortization of Purchased Intangibles	19	171	$ 108
Other intangible assets	$ 6,800	$ 887