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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, 2019 | Jun. 30, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying amount | $ 8,031 | $ 9,013
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated fair value | 8,065 | $ 8,852
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 | $ 163 |

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