Consolidated Statement of Comprehensive Income Statement (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 31, 2014		Jul. 31, 2013	Jul. 31, 2012
Net income	$ 907		$ 858	$ 792
Realized gain reclassified to net income	(13)	[1]	0	0
Foreign currency translation losses	(5)		(4)	(7)
Total other comprehensive income (loss), net	(22)		(5)	10
Comprehensive income	885		853	802
Debt Securities [Member]
Unrealized gains (losses) on available-for-sale securities	1		(1)	(1)
Equity Securities [Member]
Unrealized gains (losses) on available-for-sale securities	(5)		0	18
Interest and Other Income [Member]
Realized gain reclassified to net income	21	[1]
Income Taxes [Member]
Related taxes on realized gain reclassified to net income	$ 8	[1]

[1] Includes $21 million of realized gain on available-for-sale equity security reclassified into interest and other income, net on the consolidated statements of operations and $8 million of related income taxes.