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Hedging Activities - Summary of Foreign Currency Gains and (Losses) from Non-Derivative Instruments (Details) - Derivatives designated for hedge accounting: - Net Investment Hedges - Euro Denominated Notes - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Derivatives, Fair Value [Line Items] |  |  |
Derivatives designated as net investment hedges: | $ 7 | $ 73 | $ (118)
Reclassification from AOCI, current period, before tax | $ 112 |  |

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