Goodwill (Schedule of Goodwill) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)
Goodwill [Roll Forward]
Balance at December 31, 2015	$ 2,803
Foreign currency translation adjustments	49
Balance at June 30, 2016	2,852
North America [Member]
Goodwill [Roll Forward]
Balance at December 31, 2015	1,756
Foreign currency translation adjustments	54
Balance at June 30, 2016	1,810
MENA/ Asia Pacific [Member]
Goodwill [Roll Forward]
Balance at December 31, 2015	190
Foreign currency translation adjustments	0
Balance at June 30, 2016	190
Europe/ SSA/ Russia [Member]
Goodwill [Roll Forward]
Balance at December 31, 2015	573
Foreign currency translation adjustments	(9)
Balance at June 30, 2016	564
Latin America [Member]
Goodwill [Roll Forward]
Balance at December 31, 2015	284
Foreign currency translation adjustments	4
Balance at June 30, 2016	$ 288