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Debt and Financing Activities - Commercial Paper (Details) - Commercial Paper - USD ($) | 6 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Mar. 31, 2019
Debt Instrument [Line Items] |  |  |
Outstanding notes (up to) | $ 4,000,000,000 |  |
Proceeds from issuance of commercial paper | 8,700,000,000 | $ 19,700,000,000 |
Repayments of commercial paper | 8,100,000,000 | $ 18,300,000,000 |
Commercial paper | $ 549,000,000 |  | $ 0
Weighted average interest rate of notes outstanding (percent) | 2.42% |  |

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