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Financial Instruments (Tables) | 6 Months Ended
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Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Estimated Fair Value of Long-term Obligations and Other Short-term Borrowings Compared to the Respective Carrying Amount | The following table summarizes the estimated fair value of our long-term obligations and other short-term borrowings compared to the respective carrying amounts at:
(in millions) | December 31, 2018 |  | June 30, 2018
Estimated fair value | $ | 8,717 |  |  | $ | 8,852 |
Carrying amount | 9,049 |  |  | 9,013 |

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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