Condensed Consolidated Statements of Comprehensive Income (Loss) (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 129	$ 157	$ 279	$ 313
Other comprehensive income (loss):
Currency translation adjustment	138	(63)	116	(79)
Net change in fair value of effective portion of cash flow hedges	(12)	(251)	(44)	(84)
Net change in pension and other benefits	(4)	(3)	(7)	(7)
Other comprehensive income (loss) before income tax effect	122	(317)	65	(170)
Income tax benefit related to items of other comprehensive income (loss)	0	(68)	(10)	(26)
Other comprehensive income (loss), net of tax	122	(249)	75	(144)
Comprehensive income (loss)	251	(92)	354	169
Comprehensive loss attributable to noncontrolling interests, net of tax	0	0	(1)	0
Comprehensive income (loss) attributable to our common shareholder	$ 251	$ (92)	$ 355	$ 169