Property, Plant And Equipment (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 1,833	$ 1,906	$ 1,844
Interest capitalized	158	102	87
Rental expense for leased properties	267	277	287
Minimum rental payments under capital leases, total	157
Minimum rental payments under operating leases with initial or remaining terms of one year or more, total	1,515
Sublease payments under operating lease	13
Property, plant and equipment included in accounts payable	502	299
Property, Plant and Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 1,357	$ 1,414	$ 1,338