Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	9 Months Ended
	Apr. 29, 2023	Apr. 30, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 39,773	$ 41,275
Other comprehensive income (loss) before reclassifications	8	(1,139)
(Gains) losses reclassified out of AOCI	(35)	(32)
Tax benefit (expense)	43	125
Ending balance	42,295	40,400
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,622)	(417)
Ending balance	(1,606)	(1,463)
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	(39)	(717)
(Gains) losses reclassified out of AOCI	15	(18)
Tax benefit (expense)	8	127
Ending balance	(395)	(426)
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	5	63
(Gains) losses reclassified out of AOCI	(50)	(15)
Tax benefit (expense)	11	(11)
Ending balance	10	36
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	42	(485)
(Gains) losses reclassified out of AOCI	0	1
Tax benefit (expense)	24	9
Ending balance	$ (1,221)	$ (1,073)