Restructuring Charges (Schedule Of Pre-Tax Charge And Remaining Costs, 2011 Initiatives) (Details) (2011 Initiatives [Member], USD $) In Millions	12 Months Ended
	Jul. 31, 2011
Total Program	$ 12
Recognized Costs	(63)
Remaining Costs to be Recognized	12
Severance Pay And Benefits [Member]
Total Program	40
Recognized Costs	(37)
Remaining Costs to be Recognized	3
Asset Impairment/Accelerated Depreciation [Member]
Total Program	25
Recognized Costs	(22)
Remaining Costs to be Recognized	3
Other Exit Costs [Member]
Total Program	10
Recognized Costs	(4)
Remaining Costs to be Recognized	6
Total Program [Member]
Total Program	$ 75