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Financial Instruments and Other Financing Arrangements (Summary of Estimated Fair Value of Our Long-Term Obligations and Other Short-Term Borrowings) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Jun. 30, 2013
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying amount | $ 3,934 | $ 3,854
Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated fair value | $ 3,995 | $ 3,899

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