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Consolidated Balance Sheets, as of December 31 (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Trade receivables, allowances $ 42 $ 35
Other receivables, allowances $ 42 $ 44
Common stock, no par value (in dollars per share) $ 0 $ 0
Common stock, shares authorized (in shares) 5,000,000,000 5,000,000,000
Common stock, shares issued (in shares) 1,996,537,778 1,996,537,778
Treasury stock, at cost, shares (in shares) 577,363,557 561,531,524