Segment Information (Schedule of Other Items) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 1,560	$ 1,380	$ 1,503
Equity in earnings of affiliates	192	177	99
Affiliate net assets	1,117	1,041	1,014
Purchases of property, plant and equipment	1,843	1,508	1,308
Operating Segments [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	1,377	1,199	1,317
Equity in earnings of affiliates	193	180	89
Affiliate net assets	1,387	1,364	1,293
Purchases of property, plant and equipment	1,610	1,374	1,179
Significant Reconciling Items [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	183	181	186
Equity in earnings of affiliates	(1)	(3)	10
Affiliate net assets	(270)	(323)	(279)
Purchases of property, plant and equipment	$ 233	$ 134	$ 129