Shareholders' Equity (Changes in the Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
AOCI, Net of Tax [Roll Forward]
Balance at beginning of period	$ 1,425	$ 903	$ 1,792	$ 6,330
Total other comprehensive income/(loss), net of tax	34	(2)	51	(24)
Balance at end of period	1,975	1,002	1,975	1,002
Foreign Currency Translation Adjustments
AOCI, Net of Tax [Roll Forward]
Balance at beginning of period			(92)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			33
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0
Total other comprehensive income/(loss), net of tax			33
Balance at end of period	(59)		(59)
Unrealized Gain/(Loss) on Derivatives, net of tax
AOCI, Net of Tax [Roll Forward]
Balance at beginning of period			(12)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			15
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			3
Total other comprehensive income/(loss), net of tax			18
Balance at end of period	6		6
Accumulated Other Comprehensive Loss
AOCI, Net of Tax [Roll Forward]
Balance at beginning of period			(104)
Total other comprehensive income/(loss), net of tax			51
Balance at end of period	(53)		(53)
AOCI Attributable to Parent
AOCI, Net of Tax [Roll Forward]
Balance at beginning of period	(87)	(101)	(104)	(79)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			48
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			3
Balance at end of period	$ (53)	$ (103)	$ (53)	$ (103)