Shareholders' Equity (Changes in the Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
AOCI, Net of Tax [Roll Forward]
Balance at beginning of period	$ 6,828
Total other comprehensive income, net of tax	39	$ 0
Balance at end of period	6,695
Foreign Currency Translation Adjustments
AOCI, Net of Tax [Roll Forward]
Balance at beginning of period	(148)
Other comprehensive income/(loss), before reclassifications	40
Amounts reclassified to earnings	0
Total other comprehensive income, net of tax	40
Balance at end of period	(108)
Unrealized Gain/(Loss) on Derivatives, net of tax
AOCI, Net of Tax [Roll Forward]
Balance at beginning of period	23
Other comprehensive income/(loss), before reclassifications	(1)
Amounts reclassified to earnings	0
Total other comprehensive income, net of tax	(1)
Balance at end of period	22
Accumulated Other Comprehensive Loss
AOCI, Net of Tax [Roll Forward]
Balance at beginning of period	(125)
Other comprehensive income/(loss), before reclassifications	39
Amounts reclassified to earnings	0
Total other comprehensive income, net of tax	39
Balance at end of period	$ (86)