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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Consolidated Balance Sheets [Abstract]    
Doubtful accounts and allowances $ 69 $ 64
Inventory reserves 182 182
Accumulated depreciation $ 12,136 $ 11,932
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) 1,715,000,000 1,713,000,000
Treasury stock, shares held (in shares) 933,000,000 925,000,000