Acquisitions, Goodwill and Other Intangible Assets (Other Intangible Assets, Net) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Other Intangible Assets, Net [Abstract]
Intangible assets subject to amortization	$ 16,679	$ 17,688
Indefinite-lived intangible assets(a)	101	109
Total	$ 16,779	$ 17,797