Debt and Credit Facilities (Schedule of Long-Term Debt) (Details) - USD ($) $ in Millions	Apr. 30, 2016	Jun. 30, 2015	Apr. 30, 2015
Long - term debt
Total long term debt	$ 1,230		$ 993
Less current portion	0		250
Total Long term debt excluding current portion	1,230		743
2.5% notes, due in fiscal 2016 [Member]
Long - term debt
Total long term debt	$ 0		$ 250
Interest rate on long term debt (percent)	2.50%		2.50%
Debt Instrument, Face Amount	$ 250		$ 250
1.0% notes due in fiscal 2018 [Member]
Long - term debt
Total long term debt	$ 249		$ 248
Interest rate on long term debt (percent)	1.00%		1.00%
Debt Instrument, Face Amount	$ 250		$ 250
2.25% notes due in Fiscal 2023 [Member]
Long - term debt
Total long term debt	$ 248		$ 247
Interest rate on long term debt (percent)	2.25%		2.25%
Debt Instrument, Face Amount	$ 250		$ 250
3.75% notes due in Fiscal 2043 [Member]
Long - term debt
Total long term debt	$ 248		$ 248
Interest rate on long term debt (percent)	3.75%		3.75%
Debt Instrument, Face Amount	$ 250		$ 250
4.5% notes due in Fiscal 2046 [Member]
Long - term debt
Total long term debt	$ 485		$ 0
Interest rate on long term debt (percent)	4.50%	4.50%	4.50%
Debt Instrument, Face Amount	$ 500	$ 500	$ 500