Goodwill and Intangible Assets, Net - Schedule of Information Regarding Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2023	Mar. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 5,384	$ 5,398
Accumulated Amortization	(3,242)	(3,121)
Net Carrying Amount	$ 2,142	2,277
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Amortization Period (Years)	11 years
Gross Carrying Amount	$ 2,970	2,971
Accumulated Amortization	(1,823)	(1,765)
Net Carrying Amount	$ 1,147	1,206
Service agreements
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Amortization Period (Years)	10 years
Gross Carrying Amount	$ 1,135	1,137
Accumulated Amortization	(654)	(623)
Net Carrying Amount	$ 481	514
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Amortization Period (Years)	12 years
Gross Carrying Amount	$ 831	833
Accumulated Amortization	(453)	(430)
Net Carrying Amount	$ 378	403
Technology
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Amortization Period (Years)	10 years
Gross Carrying Amount	$ 264	264
Accumulated Amortization	(137)	(129)
Net Carrying Amount	$ 127	135
Other
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Amortization Period (Years)	6 years
Gross Carrying Amount	$ 184	193
Accumulated Amortization	(175)	(174)
Net Carrying Amount	$ 9	$ 19