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Debt and Financing Activities - Commercial Paper (Details) - Commercial Paper - USD ($) | 9 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2020
Debt Instrument [Line Items] |  |  |
Outstanding notes (up to) | $ 4,000,000,000.0 |  |
Proceeds from issuance of commercial paper | 5,500,000,000 | $ 15,900,000,000 |
Repayments of commercial paper | 5,300,000,000 | $ 13,700,000,000 |
Commercial paper | $ 152,000,000 |  | $ 0
Weighted average interest rate (percent) | 0.21% |  |

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