Consolidated Balance Sheets (Parentheticals) - USD ($) shares in Millions, $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Statement of Financial Position [Abstract]
Trade accounts receivable, net of doubtful accounts	$ 31	$ 33
Property, plant and equipment, net of accumulated depreciation	$ 14,523	$ 14,492
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 stock, shares at cost (in shares)	990	987