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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 3,566	$ 4,027	$ 7,273	$ 8,168
United States
Disaggregation of Revenue [Line Items]
Revenues	1,093	1,193	2,224	2,402
United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	452	569	925	1,171
Other Europe
Disaggregation of Revenue [Line Items]
Revenues	1,064	1,254	2,202	2,559
Australia
Disaggregation of Revenue [Line Items]
Revenues	371	395	762	796
Other International
Disaggregation of Revenue [Line Items]
Revenues	$ 586	$ 616	$ 1,160	$ 1,240

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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