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CONDENSED CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 200 $ 195
Inventories classified in Other assets 1,076 1,117
Accumulated depreciation $ 16,375 $ 15,749
Common stock, par value (in dollars per share) $ 0.50 $ 0.50
Common stock, shares authorized (shares) 6,500,000,000 6,500,000,000
Common stock, shares issued (in shares) 3,577,103,522 3,577,103,522
Treasury stock, shares (shares) 849,974,743 828,372,200