Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 600	$ 657	$ 955
Other comprehensive income (loss):
Currency translation adjustment	(47)	(127)	(71)
Net change in fair value of effective portion of cash flow hedges	(79)	580	(402)
Net change in pension and other benefits	(54)	119	193
Other comprehensive (loss) income before income tax effect	(180)	572	(280)
Income tax (benefit) provision related to items of other comprehensive income	(36)	184	(48)
Other comprehensive (loss) income, net of tax	(144)	388	(232)
Comprehensive income	456	1,045	723
Comprehensive (loss) income attributable to noncontrolling interest, net of tax	(1)	5	23
Comprehensive income attributable to our common shareholder	$ 457	$ 1,040	$ 700