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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Class of Stock [Line Items] |  |  |
Payments for Repurchase of Common Stock |  | $ 600 | $ 0
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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