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

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + 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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