Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	6 Months Ended
	Jan. 24, 2026	Jan. 25, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 46,843	$ 45,457
Other comprehensive income (loss) before reclassifications	155	(34)
(Gains) losses reclassified out of AOCI	(14)	21
Tax benefit (expense)	(23)	(50)
Ending balance	47,723	45,530
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(954)	(1,430)
Ending balance	(836)	(1,493)
Net Unrealized Gains (Losses) on Available-for-Sale Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(57)	(241)
Other comprehensive income (loss) before reclassifications	46	75
(Gains) losses reclassified out of AOCI	8	45
Tax benefit (expense)	(9)	(40)
Ending balance	(12)	(161)
Net Unrealized Gains (Losses) Cash Flow Hedging Instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	65	79
Other comprehensive income (loss) before reclassifications	76	65
(Gains) losses reclassified out of AOCI	(22)	(24)
Tax benefit (expense)	(13)	(10)
Ending balance	106	110
Cumulative Translation Adjustment and Actuarial Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(962)	(1,268)
Other comprehensive income (loss) before reclassifications	33	(174)
(Gains) losses reclassified out of AOCI	0	0
Tax benefit (expense)	(1)	0
Ending balance	$ (930)	$ (1,442)