Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012
Statement of Other Comprehensive Income [Abstract]
Net income	$ 822	$ 734	$ 874	$ 788
Other comprehensive income (loss), net of income taxes:
Other Comprehensive Income (Loss), Unrealized Holding Gain on Securities Arising During Period, Net of Tax	0	0	0	(1)
Unrealized gains on available-for-sale equity securities	0	19	3	19
Foreign currency translation gains (losses)	0	1	1	(4)
Total other comprehensive income (loss), net	0	20	4	14
Comprehensive income	$ 822	$ 754	$ 878	$ 802