Shareholders' Equity (Changes in the Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
AOCI, Net of Tax [Roll Forward]
Balance at beginning of period			$ 6,059
Total other comprehensive income/(loss), net of tax	$ (27)	$ (9)	(31)	$ 30
Balance at end of period	6,043		6,043
Foreign Currency Translation Adjustments
AOCI, Net of Tax [Roll Forward]
Balance at beginning of period			(113)
Other comprehensive income/(loss), before reclassifications			(29)
Amounts reclassified to earnings			0
Total other comprehensive income/(loss), net of tax			(29)
Balance at end of period	(142)		(142)
Unrealized Gain/(Loss) on Derivatives, net of tax
AOCI, Net of Tax [Roll Forward]
Balance at beginning of period			21
Other comprehensive income/(loss), before reclassifications			0
Amounts reclassified to earnings			(2)
Total other comprehensive income/(loss), net of tax			(2)
Balance at end of period	19		19
Accumulated Other Comprehensive Loss
AOCI, Net of Tax [Roll Forward]
Balance at beginning of period			(92)
Other comprehensive income/(loss), before reclassifications			(29)
Amounts reclassified to earnings			(2)
Total other comprehensive income/(loss), net of tax			(31)
Balance at end of period	$ (123)		$ (123)