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Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023	Jun. 07, 2024
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 2,405	$ 2,344
Amortization of intangible assets	95	$ 93	$ 94
PAR Government Systems Corporation (PGSC)
Finite-Lived Intangible Assets [Line Items]
Goodwill				$ 61
Finite-lived intangible assets acquired	$ 27

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