Investments In And Advances To Affiliates (Combined Balance Sheets And Statements Of Earnings Of The Company's Unconsolidated Affiliates) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Combined balance sheets and statements of earnings of the Company's unconsolidated affiliates:
Current assets	$ 28,200	$ 25,145
Non-current assets	21,411	21,347
Current liabilities	(24,209)	(20,587)
Non-current liabilities	(4,250)	(5,830)
Noncontrolling interests	(981)	(943)
Net assets	20,171	19,132
Net sales	55,908	45,296	$ 47,980
Gross profit	4,687	4,375	4,530
Net income	$ 1,800	$ 1,119	$ 1,428