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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 $ 86 $ 97
Common stock - par value (in usd per share) $ 0.001 $ 0.001
Common stock - shares authorized (in shares) 3,580,000,000 3,580,000,000
Common stock - shares outstanding (in shares) 681,000,000 684,000,000
Treasury stock - shares (in shares) 1,027,000,000 1,021,000,000