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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 6 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |
Payments for Repurchase of Common Stock | $ 150 | $ 600
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 | 2.2 |
Treasury shares acquired, average price per share (in usd per share) | $ 67.92 | $ 74.08

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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