Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Jun. 30, 2022	Sep. 30, 2021
Statement of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 112	$ 116
Common stock, par value per share	$ 0.50	$ 0.50
Common stock, shares authorized	1,200.0	1,200.0
Common stock, shares issued	953.4	953.4
Common stock, shares outstanding	592.2	595.8
Treasury stock, shares	361.2	357.6