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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 4,027	$ 4,554	$ 8,168	$ 9,056
United States
Disaggregation of Revenue [Line Items]
Revenues	1,193	1,666	2,402	3,375
United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	569	579	1,171	1,152
Other Europe
Disaggregation of Revenue [Line Items]
Revenues	1,254	1,244	2,559	2,449
Australia
Disaggregation of Revenue [Line Items]
Revenues	395	390	796	751
Other International
Disaggregation of Revenue [Line Items]
Revenues	$ 616	$ 675	$ 1,240	$ 1,329

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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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