Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	6 Months Ended
	Jan. 25, 2025	Jan. 27, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 45,457	$ 44,353
Other comprehensive income (loss) before reclassifications	(34)	90
(Gains) losses reclassified out of AOCI	21	18
Tax benefit (expense)	(50)	(45)
Ending balance	45,530	46,251
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,430)	(1,575)
Ending balance	(1,493)	(1,512)
Net Unrealized Gains (Losses) on Available-for-Sale Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(241)	(440)
Other comprehensive income (loss) before reclassifications	75	132
(Gains) losses reclassified out of AOCI	45	43
Tax benefit (expense)	(40)	(42)
Ending balance	(161)	(307)
Net Unrealized Gains (Losses) Cash Flow Hedging Instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	79	18
Other comprehensive income (loss) before reclassifications	65	39
(Gains) losses reclassified out of AOCI	(24)	(23)
Tax benefit (expense)	(10)	(4)
Ending balance	110	30
Cumulative Translation Adjustment and Actuarial Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,268)	(1,153)
Other comprehensive income (loss) before reclassifications	(174)	(81)
(Gains) losses reclassified out of AOCI	0	(2)
Tax benefit (expense)	0	1
Ending balance	$ (1,442)	$ (1,235)