Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Goodwill (Schedule of Goodwill) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Roll Forward]
Beginning Balance			$ 3,290us-gaap_Goodwill	$ 3,871us-gaap_Goodwill
Acquisitions			6us-gaap_GoodwillAcquiredDuringPeriod	2us-gaap_GoodwillAcquiredDuringPeriod
Disposals				(41)
Impairment loss	(40)us-gaap_GoodwillImpairmentLoss	125us-gaap_GoodwillImpairmentLoss	(66)us-gaap_GoodwillImpairmentLoss		(589)us-gaap_GoodwillImpairmentLoss
Purchase price and other adjustments			(5)
Foreign currency translation adjustments			(214)us-gaap_GoodwillTranslationAdjustments	(123)us-gaap_GoodwillTranslationAdjustments
Ending Balance	3,011us-gaap_Goodwill		3,011us-gaap_Goodwill	3,290us-gaap_Goodwill	3,871us-gaap_Goodwill
North America [Member]
Goodwill [Roll Forward]
Beginning Balance			1,981	2,336
Acquisitions			0	0
Disposals				(23)
Purchase price and other adjustments			1	1
Foreign currency translation adjustments			(86)	(71)
Ending Balance	1,896		1,896	1,981
Middle East/North Africa/Asia [Member]
Goodwill [Roll Forward]
Beginning Balance			207	226
Acquisitions			6	0
Disposals				(4)
Impairment loss	(12)	(512)	(12)
Purchase price and other adjustments			0	0
Foreign currency translation adjustments			(6)	(13)
Ending Balance	195		195	207
Europe/Sub-Sahara Africa/Russia [Member]
Goodwill [Roll Forward]
Beginning Balance			769	955
Acquisitions			0	2
Disposals				(13)
Impairment loss	(13)	(77)	(39)
Purchase price and other adjustments			8	(3)
Foreign currency translation adjustments			(115)	(29)
Ending Balance	623		623	769
Latin America [Member]
Goodwill [Roll Forward]
Beginning Balance			333	354
Acquisitions			0	0
Disposals				(1)
Impairment loss	(15)		(15)
Purchase price and other adjustments			(14)	2
Foreign currency translation adjustments			(7)	(10)
Ending Balance	297		297	333
Restatement Adjustment [Member]
Goodwill [Roll Forward]
Ending Balance				(419)
Restatement Adjustment [Member] \| North America [Member]
Goodwill [Roll Forward]
Ending Balance				(262)
Restatement Adjustment [Member] \| Middle East/North Africa/Asia [Member]
Goodwill [Roll Forward]
Ending Balance				(2)
Restatement Adjustment [Member] \| Europe/Sub-Sahara Africa/Russia [Member]
Goodwill [Roll Forward]
Ending Balance				(143)
Restatement Adjustment [Member] \| Latin America [Member]
Goodwill [Roll Forward]
Ending Balance				$ (12)