Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Land	$ 387	$ 413
Buildings	2,262	2,411
Machinery and equipment	11,787	12,392
Construction in progress	783	733
Property, plant and equipment, gross	15,219	15,949
Accumulated depreciation	(8,637)	(9,029)
Property plant and equipment, net before spare parts	6,582	6,920
Spare parts	195	233
Property, plant and equipment, net	6,777	7,153
Owned
Property, Plant and Equipment [Line Items]
Land	387	413
Buildings	2,230	2,375
Machinery and equipment	11,719	12,322
Construction in progress	783	733
Property, plant and equipment, gross	15,119	15,843
Accumulated depreciation	(8,605)	(9,002)
Property plant and equipment, net before spare parts	6,514	6,841
Spare parts	195	233
Property, plant and equipment, net	6,709	7,074
Capital Leases
Property, Plant and Equipment [Line Items]
Land	0	0
Buildings	32	36
Machinery and equipment	68	70
Construction in progress	0	0
Property, plant and equipment, gross	100	106
Accumulated depreciation	(32)	(27)
Property plant and equipment, net before spare parts	68	79
Spare parts	0	0
Property, plant and equipment, net	$ 68	$ 79
Minimum | Building and Building Improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Minimum | Machinery and Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Maximum | Building and Building Improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	45 years
Maximum | Machinery and Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	40 years