Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Doubtful accounts and allowances	$ 62	$ 48
Inventory reserves	160	146
Accumulated depreciation	$ 10,206	$ 9,188
Convertible preferred stock, par value (in dollars per share)	$ 100	$ 100
Convertible preferred stock, shares authorized (in shares)	3,100	3,100
Convertible preferred stock, shares issued (in shares)	2,300	2,300
Common stock, par value (in dollars per share)	$ 0.50	$ 0.50
Common stock, shares authorized (in shares)	3,800,000,000	3,800,000,000
Common stock, shares issued (in shares)	1,689,000,000	1,681,000,000
Treasury stock, shares held (in shares)	738,000,000	551,000,000