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Financial Instruments (Schedule of Gain/(Loss) Recognized in Earnings for Interest Rate Contracts Designated as Fair Value Hedges) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015
Derivative [Line Items] |  |  |  |
Document Period End Date |  | Jun. 30, 2017 |  |
Fair value adjustment related to previously terminated swaps | $ 22 |  | $ 22 |
Fair Value Hedging | Interest Rate Swaps | Interest Expense, Net |  |  |  |
Derivative [Line Items] |  |  |  |
Gain/(loss) on derivative |  | $ 17 | 23 | $ 14
Fair Value Hedging | Fixed-Rate Debt | Interest Expense, Net |  |  |  |
Derivative [Line Items] |  |  |  |
Gain/(loss) on derivative |  | $ (17) | $ (23) | $ (14)

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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