Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	6 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Payments for Repurchase of Common Stock	$ 600	$ 150
Treasury Shares
Class of Stock [Line Items]
Treasury shares acquired (using cost method), shares	11.5	2.2
Treasury shares acquired, average price per share (in usd per share)	$ 52.32	$ 67.92

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The cash outflow to reacquire common stock during the period.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Number of shares that have been repurchased during the period and are being held in treasury.

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