CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2024	Sep. 30, 2023	Jun. 30, 2023
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 87	$ 71	$ 87
Accumulated depreciation	$ 4,861	$ 4,581	$ 4,536
Preferred Stock, shares authorized (in shares)	5,000,000	5,000,000	5,000,000
Preferred Stock, shares issued (in shares)	0	220,000	220,000
Common Stock, shares authorized (in shares)	450,000,000	450,000,000	450,000,000
Common Stock, shares issued (in shares)	216,119,814	210,906,052	210,882,552