Property, Plant and Equipment - Textual Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Depreciation expense for property, plant and equipment
Depreciation expense related to property, plant and equipment		$ 1,637	$ 1,706	$ 1,579
Impaired machinery and equipment	$ 1,320