Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 661	$ (122)	$ 1,554	$ 305
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments	89	76	460	(157)
Realized and unrealized gains (losses) on derivatives	(18)	6	(9)	3
Pension and postretirement plans	(1)	0	(2)	(1)
Other comprehensive income (loss)	70	82	449	(155)
Total comprehensive income (loss)	731	(40)	2,003	150
Comprehensive income attributable to noncontrolling interests	98	64	210	108
Comprehensive income (loss)	$ 633	$ (104)	$ 1,793	$ 42