Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 28, 2023	Oct. 29, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 44,353	$ 39,773
Other comprehensive income (loss) before reclassifications	(488)	(579)
(Gains) losses reclassified out of AOCI	7	(13)
Tax benefit (expense)	31	96
Ending balance	45,210	40,272
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,575)	(1,622)
Ending balance	(2,025)	(2,118)
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	(170)	(329)
(Gains) losses reclassified out of AOCI	20	6
Tax benefit (expense)	36	77
Ending balance	(554)	(625)
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	38	32
(Gains) losses reclassified out of AOCI	(12)	(19)
Tax benefit (expense)	(6)	(3)
Ending balance	38	54
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	(356)	(282)
(Gains) losses reclassified out of AOCI	(1)	0
Tax benefit (expense)	1	22
Ending balance	$ (1,509)	$ (1,547)