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Debt and Financing Activities - Commercial Paper (Details) - Commercial Paper - USD ($) | Dec. 31, 2016 | Mar. 31, 2016
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Debt Instrument [Line Items] |  |
Outstanding notes (up to) | $ 3,500,000,000.0 |
Outstanding obligations | $ 1,400,000,000 | $ 0
Weighted average interest rate (percent) | 1.05% |

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