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Debt and Financing Activities - Commercial Paper (Details) - Commercial Paper - USD ($) | 9 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2018
Debt Instrument [Line Items] |  |  |
Outstanding notes (up to) | $ 3,500,000,000.0 |  |
Proceeds from Issuance of Commercial Paper | 30,400,000,000 | $ 12,700,000,000 |
Repayments of Commercial Paper | 29,300,000,000 | $ 12,100,000,000 |
Commercial paper | $ 1,100,000,000 |  | $ 0
Weighted average interest rate (percent) | 3.20% |  |

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