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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 9 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Class of Stock [Line Items] |  |
Payments for Repurchase of Common Stock | $ 600 | $ 300
Treasury Stock, Shares, Retired | 37.0 |
Treasury Stock, Common, Value | $ (2,500) |
Common Stock, Shares, Outstanding | 302 |
Retained earnings | $ 2,200 |
Treasury Shares |  |
Class of Stock [Line Items] |  |
Treasury shares acquired (using cost method), shares | 8.1 |
Treasury shares acquired, average price per share (in usd per share) | $ 74.08 |

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