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Divestitures (Details) € in Millions, $ in Millions		12 Months Ended
	Jan. 01, 2021 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2023 EUR (€)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sale		$ 7	$ 79	$ 190
AXA Bank Germany
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total consideration	$ 101
Discontinued Operations, Disposed of by Sale | Series Of Insignificant Disposal Groups
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sale		$ 7	$ 79	(25)
Discontinued Operations, Disposed of by Sale | FDB Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sale				215
Transaction consideration				$ 329	€ 308

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