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Debt and Financing Activities - Commercial Paper (Details) - Commercial Paper - USD ($) | Jun. 30, 2017 | Mar. 31, 2017
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Debt Instrument [Line Items] |  |
Outstanding notes (up to) | $ 3,500,000,000.0 |
Commercial paper | $ 0 | $ 183,000,000
Weighted average interest rate (percent) |  | 1.20%

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