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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
Dec. 31, 2015
Jun. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying amount $ 5,525 $ 5,492
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Estimated fair value $ 5,625 $ 5,521