Accounting Policies - Reclassifications and Adjustments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of Goods Sold	$ 2,813	$ 3,027	$ 5,514	$ 6,093
Scenario, Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of Goods Sold	$ 24