Property, Plant and Equipment (Schedule of Property, Plant And Equipment) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 24,130	$ 23,773
Building [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	4,468	4,502
Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	17,410	17,219
Land [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	506	550
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 1,746	$ 1,502