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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Total Revenues	$ 12,871	$ 13,667	$ 14,430
United States
Disaggregation of Revenue [Line Items]
Total Revenues	3,560	3,909	4,320
United Kingdom
Disaggregation of Revenue [Line Items]
Total Revenues	1,817	1,881	1,883
Other Europe
Disaggregation of Revenue [Line Items]
Total Revenues	4,128	4,267	4,429
Australia
Disaggregation of Revenue [Line Items]
Total Revenues	1,145	1,261	1,449
Other International
Disaggregation of Revenue [Line Items]
Total Revenues	$ 2,221	$ 2,349	$ 2,349

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