Consolidated Statement of Comprehensive Income Statement - USD ($) $ in Millions		12 Months Ended
		Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Net income		$ 979	$ 365	$ 907
Other comprehensive income (loss), net of income taxes:
Realized gain reclassified to net income	[1]	0	0	(13)
Foreign currency translation losses		(3)	(27)	(5)
Total other comprehensive loss, net		(2)	(28)	(22)
Comprehensive income		977	337	885
Interest and Other Income
Other comprehensive income (loss), net of income taxes:
Realized gain reclassified to net income	[1]	21
Income Taxes
Other comprehensive income (loss), net of income taxes:
Related taxes on realized gain reclassified to net income	[1]	8
Debt Securities
Other comprehensive income (loss), net of income taxes:
Unrealized gains (losses) on available-for-sale securities		1	(1)	1
Equity Securities
Other comprehensive income (loss), net of income taxes:
Unrealized gains (losses) on available-for-sale securities		$ 0	$ 0	$ (5)

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