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CONDENSED CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 78 $ 85
Inventories classified in Other assets 2,175 2,197
Accumulated depreciation $ 18,732 $ 18,982
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 1,045,799,775 1,046,877,695