Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Payments for Repurchase of Common Stock	$ 0	$ 0	$ 350	$ 600
Treasury Shares
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired	(1.0)	(2.0)	(7.3)	(11.0)
Payments for Repurchase of Common Stock	$ 70	$ 120	$ 350	$ 600
Treasury shares acquired, average price per share (in usd per share)			$ 48.00	$ 52.32
Treasury Stock Acquired Shares				11.5