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Consolidated Balance Sheet (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 51 $ 37
Common stock authorized (in shares) 2,500,000,000 2,500,000,000
Common stock, par value (in usd per share) $ 0.01 $ 0.01
Common stock issued (in shares) 649,638,881 648,643,223
Treasury stock (in shares) 211,771,827 211,771,827