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Consolidated Balance Sheet (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]            
Allowance for doubtful accounts $ 39   $ 41      
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) 648,468,487 648,447,000 647,416,633 646,828,000 646,716,000 645,692,000
Treasury stock (in shares) 211,771,827 211,772,000 206,390,806 198,287,000 193,165,000 189,526,000