Condensed Consolidated Statement of Shareholder's Equity (unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	(Accumulated Deficit)/Retained Earnings	Accumulated Other Comprehensive Loss (AOCI)	Non- controlling Interests
Beginning balance, shares at Mar. 31, 2023		600,000,000
Beginning balance at Mar. 31, 2023	$ 3,454	$ 0	$ 1,208	$ 2,472	$ (238)	$ 12
Increase (Decrease) in Stockholders' Equity
Net income attributable to our common shareholder	313			313
Net income attributable to noncontrolling interests	0
Currency translation adjustment included in other comprehensive income (loss)	(79)				(79)
Change in fair value of effective portion of cash flow hedges, net of tax provision (benefit) included in other comprehensive (loss) income	(60)				(60)
Change in pension and other (benefit) provision, net of tax provision included in other comprehensive income (loss)	(5)				(5)	0
Ending balance, shares at Sep. 30, 2023		600,000,000
Ending balance at Sep. 30, 2023	3,623	$ 0	1,208	2,785	(382)	12
Beginning balance, shares at Jun. 30, 2023		600,000,000
Beginning balance at Jun. 30, 2023	3,715	$ 0	1,208	2,628	(133)	12
Increase (Decrease) in Stockholders' Equity
Net income attributable to our common shareholder	157			157
Net income attributable to noncontrolling interests	0
Currency translation adjustment included in other comprehensive income (loss)	(63)				(63)
Change in fair value of effective portion of cash flow hedges, net of tax provision (benefit) included in other comprehensive (loss) income	(184)				(184)
Change in pension and other (benefit) provision, net of tax provision included in other comprehensive income (loss)	(2)				(2)	0
Ending balance, shares at Sep. 30, 2023		600,000,000
Ending balance at Sep. 30, 2023	3,623	$ 0	1,208	2,785	(382)	12
Beginning balance, shares at Mar. 31, 2024		600,000,000
Beginning balance at Mar. 31, 2024	3,810	$ 0	1,108	3,072	(381)	11
Increase (Decrease) in Stockholders' Equity
Net income attributable to our common shareholder	279			279
Net income attributable to noncontrolling interests	0
Currency translation adjustment included in other comprehensive income (loss)	116				116
Change in fair value of effective portion of cash flow hedges, net of tax provision (benefit) included in other comprehensive (loss) income	(35)				(35)
Change in pension and other (benefit) provision, net of tax provision included in other comprehensive income (loss)	(6)				(5)	(1)
Ending balance, shares at Sep. 30, 2024		600,000,000
Ending balance at Sep. 30, 2024	4,164	$ 0	1,108	3,351	(305)	10
Beginning balance, shares at Jun. 30, 2024		600,000,000
Beginning balance at Jun. 30, 2024	3,913	$ 0	1,108	3,223	(428)	10
Increase (Decrease) in Stockholders' Equity
Net income attributable to our common shareholder	128			128
Net income attributable to noncontrolling interests	1					1
Currency translation adjustment included in other comprehensive income (loss)	138				138
Change in fair value of effective portion of cash flow hedges, net of tax provision (benefit) included in other comprehensive (loss) income	(12)				(12)
Change in pension and other (benefit) provision, net of tax provision included in other comprehensive income (loss)	(4)				(3)	(1)
Ending balance, shares at Sep. 30, 2024		600,000,000
Ending balance at Sep. 30, 2024	$ 4,164	$ 0	$ 1,108	$ 3,351	$ (305)	$ 10