Goodwill and Other Intangibles (Changes in the Carrying Amount of Goodwill) (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015
Goodwill [Roll Forward]
Balance as of January 1, as reported		$ 7,889	$ 7,241
Goodwill acquired		74	356
Other adjustments	[1]	12	(91)
Balance at September 30,		$ 7,975	$ 7,506

[1] (a) The increase in 2016 reflects purchase accounting adjustments, partly offset by the impact of foreign exchange. The decrease in 2015 is primarily due to the impact of foreign exchange.