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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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