Property, Plant and Equipment Property, Plant and Equipment - (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Land	$ 397	$ 387
Buildings	2,323	2,262
Machinery and equipment	12,278	11,787
Construction in progress	887	783
Property, plant and equipment, gross	15,885	15,219
Accumulated depreciation	(9,125)	(8,637)
Property plant and equipment, net before spare parts	6,760	6,582
Spare parts	280	195
Property, plant and equipment, net	7,040	6,777
Owned
Property, Plant and Equipment [Line Items]
Land	397	387
Buildings	2,288	2,230
Machinery and equipment	12,232	11,719
Construction in progress	887	783
Property, plant and equipment, gross	15,804	15,119
Accumulated depreciation	(9,102)	(8,605)
Property plant and equipment, net before spare parts	6,702	6,514
Spare parts	280	195
Property, plant and equipment, net	6,982	6,709
Capital Leases
Property, Plant and Equipment [Line Items]
Land	0	0
Buildings	35	32
Machinery and equipment	46	68
Construction in progress	0	0
Property, plant and equipment, gross	81	100
Accumulated depreciation	(23)	(32)
Property plant and equipment, net before spare parts	58	68
Spare parts	0	0
Property, plant and equipment, net	$ 58	$ 68
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