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Financial Instruments (Summary of estimated fair value of our long-term obligations and other short-term borrowings) (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Jun. 30, 2015
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying amount | $ 5,546 | $ 5,492
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated fair value | $ 5,758 | $ 5,521

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