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Debt and Financing Activities - Commercial Paper (Details) - Commercial Paper - USD ($) | Dec. 31, 2015 | Nov. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Outstanding notes (up to) |  | $ 3,500,000,000.0 |  |
Outstanding obligations | $ 0 |  | $ 0 | $ 0

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