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Available-for-Sale Securities (Schedule of Available-for-Sale Securities) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017
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.

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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.

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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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