Shareholders' Equity (Comprehensive Income) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 27, 2013	Jul. 28, 2012	Jul. 30, 2011	Jul. 31, 2010
Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ 608	$ 661
Other comprehensive (loss) income	(60)	(651)	686
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	379	409	487	333
Other comprehensive (loss) income	(30)	(78)	154
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	8	(53)	6	27
Other comprehensive (loss) income	61	(59)	(21)
Accumulated Translation Adjustment [Member]
Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	221	305	801	263
Other comprehensive (loss) income	(84)	(496)	538
Parent [Member]
Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	608	661	1,294	623
Other comprehensive (loss) income	$ (53)	$ (633)	$ 671