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Shareholders' Equity Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 3 Months Ended
--- | --- | ---
Oct. 25, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Treasury Shares |  |  |
Class of Stock [Line Items] |  |  |
Treasury shares acquired (using cost method), shares |  | 9.5 | 2.2
Payments for Repurchase of Common Stock |  | $ 480 | $ (150)
Treasury shares acquired, average price per share (in usd per share) |  | $ 50.45 | $ 67.92
Subsequent Event |  |  |
Class of Stock [Line Items] |  |  |
Accelerated Share Repurchases, Cash or Stock Settlement | 2.0 |  |

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