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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, 2020 | Jun. 30, 2019
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying Amount of Long-Term and other Short-Term Borrowings | $ 6,775 | $ 8,031
Carrying amount | 6,775 | 8,031
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated fair value | $ 7,273 | 8,065
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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