Shareholders' Equity (Changes in the Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
AOCI, Net of Tax [Roll Forward]
Balance at beginning of period	$ 903	$ 5,913	$ 6,330	$ 6,059
Total other comprehensive loss, net of tax	(2)	(27)	(24)	(31)
Balance at end of period	1,002	6,043	1,002	6,043
Foreign Currency Translation Adjustments
AOCI, Net of Tax [Roll Forward]
Balance at beginning of period			(95)
Other comprehensive loss, before reclassifications			(18)
Amounts reclassified to earnings			0
Total other comprehensive loss, net of tax			(18)
Balance at end of period	(113)		(113)
Unrealized Gain/(Loss) on Derivatives, net of tax
AOCI, Net of Tax [Roll Forward]
Balance at beginning of period			16
Other comprehensive loss, before reclassifications			0
Amounts reclassified to earnings			(6)
Total other comprehensive loss, net of tax			(6)
Balance at end of period	10		10
Accumulated Other Comprehensive Loss
AOCI, Net of Tax [Roll Forward]
Balance at beginning of period			(79)
Total other comprehensive loss, net of tax			(24)
Balance at end of period	(103)		(103)
AOCI Attributable to Parent
AOCI, Net of Tax [Roll Forward]
Balance at beginning of period	(101)	(96)	(79)	(92)
Other comprehensive loss, before reclassifications			(18)
Amounts reclassified to earnings			(6)
Balance at end of period	$ (103)	$ (123)	$ (103)	$ (123)