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Shareholders' Equity (Narrative) (Details) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2015 USD ($) $ / shares shares | Jun. 30, 2014 USD ($) $ / shares shares | Jun. 30, 2013 USD ($) $ / shares shares
Common shares, Authorized | 755,000,000 | 755,000,000 |
Preferred shares, Authorized | 500,000 | 500,000 |
Treasury shares acquired (using cost method), value | $ | $ 1,036 | $ 673 | $ 450
Treasury Shares |  |  |
Treasury shares acquired (using cost method), shares | 13,100,000 | 9,900,000 | 10,200,000
Treasury shares acquired (using cost method), value | $ | $ 1,036 | $ 673 | $ 450
Treasury shares acquired, average price per share (in dollars per share) | $ / shares | $ 79.02 | $ 67.85 | $ 44.11
Three Year Aggregate | Treasury Shares |  |  |
Treasury shares acquired (using cost method), value | $ | $ 2,200 |  |
Class A |  |  |
Common shares, Authorized | 750,000,000 | 750,000,000 |
Common shares, voting rights per share (text) | one vote | one vote |
Common shares, voting rights per share (number of votes per share owned) | 1 | 1 |
Class B |  |  |
Common shares, Authorized | 5,000,000 | 5,000,000 |
Common shares, voting rights per share (text) | one-fifth of one vote | one-fifth of one vote |
Common shares, voting rights per share (number of votes per share owned) | 0.2 | 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) 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 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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