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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, 2020 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) shares
Class of Stock [Line Items] |  |  |  |  |
Common shares, authorized |  | 755,000,000 | 755,000,000 |  | 755,000,000
Preferred shares, authorized |  | 500,000 | 500,000 |  | 500,000
Treasury shares acquired | $ |  | $ 350 | $ 600 | $ 550 |
Payments for Repurchase of Common Stock | $ |  | 350 | 600 | 550 |
Retained earnings decrease | $ |  | (1,170) | (5,434) |  | $ (1,170)
Treasury Shares |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Treasury shares acquired | $ |  | $ 350 | $ 600 | $ 550 | $ 1,500
Treasury Stock, Shares, Acquired |  | 7,300,000 | 11,000,000 | 8,400,000 |
Payments for Repurchase of Common Stock | $ |  | $ 350 |  |  |
Treasury shares acquired, average price per share (in usd per share) | $ / shares |  | $ 48.00 | $ 52.32 | $ 65.30 |
Treasury Stock Acquired Shares |  |  | 11,500,000 |  |
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
Common Stock, Voting Rights, Votes |  | 0.2 |  |  |
Accelerated share repurchase plan | Treasury Shares |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Treasury Stock, Shares, Acquired | 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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