Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	9 Months Ended
	Apr. 27, 2024	Apr. 29, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 44,353	$ 39,773
Other comprehensive income (loss) before reclassifications	(27)	8
(Gains) losses reclassified out of AOCI	19	(35)
Tax benefit (expense)	(47)	43
Ending balance	45,768	42,295
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,575)	(1,622)
Ending balance	(1,630)	(1,606)
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	74	(39)
(Gains) losses reclassified out of AOCI	57	15
Tax benefit (expense)	(26)	8
Ending balance	(335)	(395)
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	122	5
(Gains) losses reclassified out of AOCI	(36)	(50)
Tax benefit (expense)	(20)	11
Ending balance	84	10
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	(223)	42
(Gains) losses reclassified out of AOCI	(2)	0
Tax benefit (expense)	(1)	24
Ending balance	$ (1,379)	$ (1,221)