Equity and Noncontrolling Interests - Schedule of AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' equity, beginning balance	$ 2,718	$ 1,535
Aggregate adjustment for the period, net of tax	22	100
Stockholders' equity, ending balance	2,679	1,797
Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' equity, beginning balance	(627)	(665)
Stockholders' equity, ending balance	(612)	(582)
Foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' equity, beginning balance	(617)	(634)
Aggregate adjustment for the period, net of tax	17	55
Stockholders' equity, ending balance	(600)	(579)
Realized and unrealized gains (losses) on derivatives
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' equity, beginning balance	(8)	(28)
Current period changes in fair value, net of tax	(1)	25
Reclassification to income, net of tax	(1)	3
Stockholders' equity, ending balance	(10)	0
Pension and postretirement plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' equity, beginning balance	(2)	(3)
Stockholders' equity, ending balance	$ (2)	$ (3)