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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Mar. 21, 2018 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Class of Stock [Line Items] |  |  |  |
Payments for Repurchase of Common Stock |  |  | $ 600 | $ 450
Treasury Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Treasury Stock, Shares, Acquired |  | (4.0) | (11.5) | (6.5)
Treasury shares acquired, average price per share (in usd per share) |  |  | $ 52.32 | $ 68.81
accelerated share repurchase plan [Member] | Treasury Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Treasury Stock, Shares, Acquired | (4.3) |  |  |
Payments for Repurchase of Common Stock | $ 300 |  |  |
Treasury shares acquired, average price per share (in usd per share) | $ 69.26 |  |  |

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