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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Class of Stock [Line Items] |  |  |  |
Payments for Repurchase of Common Stock |  |  | $ 450 | $ 600
Accelerated Share Repurchases, Settlement (Payment) or Receipt | $ 300 |  | $ 300 |
Accelerated Share Repurchases, Cash or Stock Settlement | 4.3 |  |  |
Accelerated Share Repurchases, Final Price Paid Per Share | $ 69.26 |  |  |
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 | 6.5 |
Treasury shares acquired, average price per share (in usd per share) |  |  | $ 68.81 | $ 74.08

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- Definition Description of the nature of the settlement (cash or stock) of the accelerated share repurchases agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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