Goodwill and Intangible Assets, Net - Schedule of Information Regarding Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2025	Mar. 31, 2025
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 6,159	$ 3,288
Accumulated Amortization	(1,887)	(1,824)
Net Carrying Amount	$ 4,272	1,464
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Amortization Period (Years)	10 years
Gross Carrying Amount	$ 1,487	1,475
Accumulated Amortization	(675)	(650)
Net Carrying Amount	$ 812	825
Service agreements
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Amortization Period (Years)	23 years
Gross Carrying Amount	$ 3,298	1,116
Accumulated Amortization	(752)	(728)
Net Carrying Amount	$ 2,546	388
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Amortization Period (Years)	20 years
Gross Carrying Amount	$ 575	378
Accumulated Amortization	(282)	(278)
Net Carrying Amount	$ 293	100
Technology
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Amortization Period (Years)	9 years
Gross Carrying Amount	$ 312	288
Accumulated Amortization	(146)	(141)
Net Carrying Amount	$ 166	147
Other
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Amortization Period (Years)	22 years
Gross Carrying Amount	$ 487	31
Accumulated Amortization	(32)	(27)
Net Carrying Amount	$ 455	$ 4