Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) shares in Thousands, $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Doubtful accounts and allowances	$ 39	$ 42
Accumulated depreciation	$ 14,010	$ 13,969
Preferred stock, par value (in dollars per share)	$ 100	$ 100
Preferred stock, shares authorized (in shares)	10,000	10,000
referred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.50	$ 0.50
Common stock, shares authorized (in shares)	3,800,000	3,800,000
Common stock, shares issued (in shares)	1,800,000	1,800,000
Treasury stock, shares held (in shares)	973,000	970,000