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Financial Instruments (Summary of Estimated Fair Value of Long-term Obligations and Other Short-term Borrowings) (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Jun. 30, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying amount | $ 9,013 | $ 10,395
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated fair value | $ 8,852 | 10,713
Interest Rate Swaps | Designated as Hedging Instrument | Fair Value Hedging |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivatives, Hedge Discontinuances, Termination of Hedging Instrument, Amount |  | $ 600

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