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Consolidated Balance Sheet (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 62 $ 67
Inventory classified in Other assets $ 2,194 $ 2,070
Common stock, par value (in dollars per share) $ 0.50 $ 0.50
Common stock, authorized (in 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 (in shares) 1,049,499,023 1,046,877,695