Property, Plant and Equipment (Schedule of Property, Plant And Equipment) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 32,761	$ 29,967
Building [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	5,297	4,492
Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	25,338	23,384
Land [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	669	544
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 1,457	$ 1,547