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Shareholders' Equity (Narrative) (Details) $ / shares in Units, $ in Millions | 12 Months Ended | 36 Months Ended
--- | --- | ---
Jun. 30, 2016 USD ($) $ / shares shares | Jun. 30, 2015 USD ($) $ / shares shares | Jun. 30, 2014 USD ($) $ / shares shares | Jun. 30, 2016 USD ($) shares
Class of Stock [Line Items] |  |  |  |
Common shares, authorized | 755,000,000 | 755,000,000 |  | 755,000,000
Preferred shares, authorized | 500,000 | 500,000 |  | 500,000
Treasury shares acquired (using cost method), value | $ | $ 651 | $ 1,036 | $ 673 |
Treasury Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Treasury shares acquired (using cost method), value | $ | $ 651 | $ 1,036 | $ 673 | $ 2,400
Treasury shares acquired (using cost method), shares | 8,200,000 | 13,100,000 | 9,900,000 |
Treasury shares acquired, average price per share (in usd per share) | $ / shares | $ 78.98 | $ 79.02 | $ 67.85 |
Common Class A |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common shares, authorized | 750,000,000 | 750,000,000 |  | 750,000,000
Common Stock, Voting Rights, Votes | 1 |  |  |
Common Class B |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common shares, authorized | 5,000,000 | 5,000,000 |  | 5,000,000
Common Stock, Voting Rights, Votes | 0.2 |  |  |

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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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