Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Trade receivables, allowances	$ 40	$ 35
Other receivables, allowances	$ 40	$ 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 (in shares)	568,483,191	561,531,524