Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	6 Months Ended
	Jan. 27, 2024	Jan. 28, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 44,353	$ 39,773
Other comprehensive income (loss) before reclassifications	90	18
(Gains) losses reclassified out of AOCI	18	(29)
Tax benefit (expense)	(45)	47
Ending balance	46,251	41,474
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,575)	(1,622)
Ending balance	(1,512)	(1,586)
Net Unrealized Gains (Losses) on Available-for-Sale Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(440)	(379)
Other comprehensive income (loss) before reclassifications	132	(76)
(Gains) losses reclassified out of AOCI	43	9
Tax benefit (expense)	(42)	11
Ending balance	(307)	(435)
Net Unrealized Gains (Losses) Cash Flow Hedging Instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	18	44
Other comprehensive income (loss) before reclassifications	39	(12)
(Gains) losses reclassified out of AOCI	(23)	(37)
Tax benefit (expense)	(4)	12
Ending balance	30	7
Cumulative Translation Adjustment and Actuarial Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,153)	(1,287)
Other comprehensive income (loss) before reclassifications	(81)	106
(Gains) losses reclassified out of AOCI	(2)	(1)
Tax benefit (expense)	1	24
Ending balance	$ (1,235)	$ (1,158)