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Basis of Presentation and Summary of Significant Accounting Policies (Narrative, Investments) (Details) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015
Accounting Policies [Abstract] |  |
Gain on sale of investments | $ 0 | $ 5

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the sale. + References No definition available. + Details
Name: | us-gaap_GainOnSaleOfInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration