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Shareholders' Equity (Narrative) (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 shares | Jun. 30, 2024 USD ($) $ / shares shares | Jun. 30, 2023 USD ($) $ / shares shares | Jun. 30, 2022 USD ($) $ / shares shares | Jun. 30, 2023 USD ($) shares
Class of Stock [Line Items] |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ |  | $ 759 | $ 2,007 | $ 1,000 |
Share repurchase program activity | $ |  | 750 | 2,000 | 1,000 |
Retained earnings decrease | $ |  | $ 286 | $ 642 |  | $ 642
Common shares, authorized |  | 755,000,000 | 755,000,000 |  | 755,000,000
Preferred shares, authorized |  | 500,000 | 500,000 |  | 500,000
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
Treasury Shares |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ |  | $ 859 | $ 1,907 | $ 1,000 |
Treasury Stock, Shares, Acquired |  | 9,000,000.0 | 24,600,000 | 19,500,000 |
Share repurchase program activity | $ |  |  |  |  | $ 3,800
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 | 900,000 | 5,700,000 | 4,600,000 | 9,800,000 |
Treasury shares acquired, average price per share (in usd per share) | $ / shares |  | $ 91.15 | $ 87.18 | $ 51.10 |
Treasury Shares | $250 million share repurchase program |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Treasury Stock, Shares, Acquired |  | 2,400,000 | 3,200,000 |  |
Treasury shares acquired, average price per share (in usd per share) | $ / shares |  | $ 88.22 | $ 77.50 |  |
Treasury Shares | Second $250 million share repurchase program [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  | 3,200,000 |  |
Treasury shares acquired, average price per share (in usd per share) | $ / shares |  |  | $ 77.27 |  |
Treasury Shares | $1 billion share repurchase program |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  | 13,600,000 |  |
Treasury shares acquired, average price per share (in usd per share) | $ / shares |  | $ 103.67 | $ 73.36 |  |

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