CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Property and equipment, accumulated depreciation	$ 3,935	$ 3,901
Common shares, par value	$ 1.25	$ 1.25
Common shares, authorized	1,360,000,000	1,360,000,000
Common shares, issued	729,141,000	729,753,000
Common shares, outstanding	729,141,000	729,753,000