Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	9 Months Ended
	Apr. 26, 2025	Apr. 27, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 45,457	$ 44,353
Other comprehensive income (loss) before reclassifications	309	(27)
(Gains) losses reclassified out of AOCI	36	19
Tax benefit (expense)	(48)	(47)
Ending balance	45,935	45,768
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,430)	(1,575)
Ending balance	(1,133)	(1,630)
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	126	74
(Gains) losses reclassified out of AOCI	75	57
Tax benefit (expense)	(58)	(26)
Ending balance	(98)	(335)
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	(5)	122
(Gains) losses reclassified out of AOCI	(39)	(36)
Tax benefit (expense)	10	(20)
Ending balance	45	84
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	188	(223)
(Gains) losses reclassified out of AOCI	0	(2)
Tax benefit (expense)	0	(1)
Ending balance	$ (1,080)	$ (1,379)