Equity in Net Assets of Affiliated Companies Equity in Net Assets of Affiliated Companies - Transactions with equity method investees (Details) - Equity Method Investee [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Related Party Transaction [Line Items]
Sales	$ 4,367	$ 4,426	$ 5,208
Purchases	8,665	7,780	9,430
Royalty income	649	610	$ 500
Receivables	722	870
Payables	$ 603	$ 671