Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 26, 2024	Oct. 28, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 45,457	$ 44,353
Other comprehensive income (loss) before reclassifications	61	(488)
(Gains) losses reclassified out of AOCI	16	7
Tax benefit (expense)	(23)	31
Ending balance	45,277	45,210
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,430)	(1,575)
Ending balance	(1,376)	(2,025)
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	71	(170)
(Gains) losses reclassified out of AOCI	25	20
Tax benefit (expense)	(23)	36
Ending balance	(168)	(554)
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	9	38
(Gains) losses reclassified out of AOCI	(9)	(12)
Tax benefit (expense)	0	(6)
Ending balance	79	38
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	(19)	(356)
(Gains) losses reclassified out of AOCI	0	(1)
Tax benefit (expense)	0	1
Ending balance	$ (1,287)	$ (1,509)