Goodwill (Schedule of Goodwill) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($)
Goodwill [Roll Forward]
Balance at December 31, 2015	$ 2,803
Foreign currency translation adjustments	37
Balance at September 30, 2016	2,840
North America [Member]
Goodwill [Roll Forward]
Balance at December 31, 2015	1,756
Foreign currency translation adjustments	41
Balance at September 30, 2016	1,797
MENA/ Asia Pacific [Member]
Goodwill [Roll Forward]
Balance at December 31, 2015	190
Foreign currency translation adjustments	2
Balance at September 30, 2016	192
Europe/ SSA/ Russia [Member]
Goodwill [Roll Forward]
Balance at December 31, 2015	573
Foreign currency translation adjustments	(10)
Balance at September 30, 2016	563
Latin America [Member]
Goodwill [Roll Forward]
Balance at December 31, 2015	284
Foreign currency translation adjustments	4
Balance at September 30, 2016	$ 288