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Shareholders' Equity (Narrative) (Details) $ / shares in Units, $ in Millions | 12 Months Ended | 36 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) shares
Class of Stock [Line Items] |  |  |  |
Treasury shares acquired | $ | $ 200 | $ 350 | $ 600 |
Payments for Repurchase of Common Stock | $ | 200 | 350 | 600 |
Retained earnings decrease | $ | $ (1,205) | $ (1,170) |  | $ (1,170)
Common shares, authorized | shares | 755,000,000 | 755,000,000 |  | 755,000,000
Common Class A |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common shares, authorized | shares | 750,000,000 |  |  |
Common Stock, Voting Rights, Votes | 1 |  |  |
Common Class B |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common shares, authorized | shares | 5,000,000 |  |  |
Treasury Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Treasury shares acquired | $ | $ 200 | $ 350 | $ 600 | $ 1,150
Treasury Stock, Shares, Acquired | shares | 3,700,000 | 7,000,000 | 11,500,000 |
Payments for Repurchase of Common Stock | $ | $ 200 |  |  |
Treasury shares acquired, average price per share (in usd per share) | $ / shares | $ 54.40 | $ 48.00 | $ 52.32 |
Treasury Stock Acquired Shares | shares |  | 7,300,000 |  |

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