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Available-for-Sale Securities (Schedule of Available-for-Sale Securities) (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Jun. 30, 2017
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Debt Securities, Available-for-sale [Line Items] |  |
Total available-for-sale securities | $ 0 | $ 65
Treasury bills |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total current available-for-sale securities | 0 | 25
International bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total current available-for-sale securities | 0 | 3
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total current available-for-sale securities | 0 | 30
U.S. agency bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total current available-for-sale securities | 0 | 3
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total current available-for-sale securities | 0 | 3
International equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total current available-for-sale securities | $ 0 | 1
Fair Value, Measurements, Recurring |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total available-for-sale securities |  | 65
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total available-for-sale securities |  | $ 65

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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