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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

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