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Shareholders' Equity (Narrative) (Details) $ / shares in Units, $ in Millions | 12 Months Ended | 36 Months Ended
--- | --- | ---
Jun. 30, 2022 USD ($) $ / shares shares | Jun. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2022 USD ($) shares
Class of Stock [Line Items] |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ | $ 1,000 | $ 200 | $ 350 |
Payments for Repurchase of Common Stock | $ | 1,000 | 200 | 350 |
Retained earnings decrease | $ | $ 280 | $ (1,205) |  | $ 280
Common shares, authorized | 755,000,000 | 755,000,000 |  | 755,000,000
Common Class A |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common shares, authorized | 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
Treasury Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ | $ 1,000 | $ 200 | $ 350 |
Treasury Stock, Shares, Acquired | 19,500,000 | 3,700,000 | 7,300,000 |
Payments for Repurchase of Common Stock | $ |  |  |  | $ 1,600
Treasury shares acquired, average price per share (in usd per share) | $ / shares |  | $ 54.40 | $ 48.00 |
Treasury Shares | $200 million share repurchase program [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Treasury Stock, Shares, Acquired | 3,600,000 |  |  |
Treasury shares acquired, average price per share (in usd per share) | $ / shares | $ 56.02 |  |  |
Treasury Shares | $300 million share repurchase program [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Treasury Stock, Shares, Acquired | 6,100,000 |  |  |
Treasury shares acquired, average price per share (in usd per share) | $ / shares | $ 49.39 |  |  |
Treasury Shares | $500 million share repurchase program [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Treasury Stock, Shares, Acquired | 9,800,000 |  |  |
Treasury shares acquired, average price per share (in usd per share) | $ / shares | $ 51.10 |  |  |

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