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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Total Revenues	$ 3,159	$ 3,236
United States
Disaggregation of Revenue [Line Items]
Total Revenues	828	897
United Kingdom
Disaggregation of Revenue [Line Items]
Total Revenues	480	448
Other Europe
Disaggregation of Revenue [Line Items]
Total Revenues	1,038	1,030
Australia
Disaggregation of Revenue [Line Items]
Total Revenues	259	299
Other International
Disaggregation of Revenue [Line Items]
Total Revenues	$ 554	$ 562

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