Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) shares in Millions, $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Doubtful accounts and allowances	$ 30	$ 40
Accumulated depreciation	$ 14,257	$ 14,147
Common stock, par value (in dollars per share)	$ 0.50	$ 0.50
Common stock, shares authorized (in shares)	3,800	3,800
Common stock, shares issued (in shares)	1,800	1,800
Treasury shares (in shares)	980	977