Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	6 Months Ended
	Jan. 28, 2023	Jan. 29, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 39,773	$ 41,275
Other comprehensive income (loss) before reclassifications	18	(440)
(Gains) losses reclassified out of AOCI	(29)	(18)
Tax benefit (expense)	47	86
Ending balance	41,474	39,496
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,622)	(417)
Ending balance	(1,586)	(789)
Net Unrealized Gains (Losses) on Available-for-Sale Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(379)	182
Other comprehensive income (loss) before reclassifications	(76)	(296)
(Gains) losses reclassified out of AOCI	9	(16)
Tax benefit (expense)	11	80
Ending balance	(435)	(50)
Net Unrealized Gains (Losses) Cash Flow Hedging Instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	44	(1)
Other comprehensive income (loss) before reclassifications	(12)	18
(Gains) losses reclassified out of AOCI	(37)	(3)
Tax benefit (expense)	12	(3)
Ending balance	7	11
Cumulative Translation Adjustment and Actuarial Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,287)	(598)
Other comprehensive income (loss) before reclassifications	106	(162)
(Gains) losses reclassified out of AOCI	(1)	1
Tax benefit (expense)	24	9
Ending balance	$ (1,158)	$ (750)