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