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Shareholders' Equity (Narrative) (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | ---
Mar. 21, 2018 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) $ / shares shares | Jun. 30, 2016 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) shares
Class of Stock [Line Items] |  |  |  |  |
Common shares, authorized | shares |  | 755,000,000 | 755,000,000 |  | 755,000,000
Preferred shares, authorized | shares |  | 500,000 | 500,000 |  | 500,000
Treasury shares acquired | $ |  | $ (550) | $ (600) | $ (651) |
Payments for Repurchase of Common Stock | $ |  | 550 | 600 | 651 |
Retained earnings decrease | $ |  | (4,645) | (4,967) |  | $ (4,645)
Treasury Shares |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Treasury shares acquired | $ |  | $ (550) | $ (600) | $ (651) | $ (1,800)
Treasury Stock, Shares, Acquired | shares |  | (8,400,000) | (8,100,000) | (8,200,000) |
Treasury shares acquired, average price per share (in usd per share) | $ / shares |  | $ 65.30 | $ 74.08 | $ 78.98 |
Retirement of Treasury Shares (in shares) | shares |  |  | (37,000,000) |  |
Common Class A |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common shares, authorized | shares |  | 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 | shares |  | 5,000,000 | 5,000,000 |  | 5,000,000
Common Stock, Voting Rights, Votes |  | 0.2 |  |  |
Retirement of Treasury Shares [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Retirement of Treasury Shares (in shares) | shares |  |  | 37,000,000 |  |
Decrease in Common Shares in Treasury | $ |  |  | $ 2,500 |  |
Decrease in Common Shares, Value | $ |  |  | 302 |  |
Retained earnings decrease | $ |  |  | $ 2,200 |  |
Accelerated share repurchase plan | Treasury Shares |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Treasury Stock, Shares, Acquired | shares | (4,300,000) |  |  |  |
Payments for Repurchase of Common Stock | $ | $ 300 |  |  |  |
Treasury shares acquired, average price per share (in usd per share) | $ / shares | $ 69.26 |  |  |  |

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