Comprehensive Income (Loss) - AOCI components (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 30, 2022	Jul. 31, 2021	Jul. 25, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of period	$ 41,275	$ 37,920	$ 33,571
Other comprehensive income (loss) before reclassifications	(1,291)	108	376
(Gains) losses reclassified out of AOCI	(36)	(64)	(35)
Tax benefit (expense)	122	58	(68)
Balance, end of period	39,773	41,275	37,920
Net Unrealized Gains (Losses) on Available-for-Sale Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of period	182	315	0
Other comprehensive income (loss) before reclassifications	(731)	(141)	420
(Gains) losses reclassified out of AOCI	(9)	(53)	(42)
Tax benefit (expense)	179	61	(63)
Balance, end of period	(379)	182	315
Net Unrealized Gains (Losses) Cash Flow Hedging Instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of period	(1)	(6)	(14)
Other comprehensive income (loss) before reclassifications	87	20	7
(Gains) losses reclassified out of AOCI	(29)	(14)	1
Tax benefit (expense)	(13)	(1)	0
Balance, end of period	44	(1)	(6)
Cumulative Translation Adjustment and Actuarial Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of period	(598)	(828)	(778)
Other comprehensive income (loss) before reclassifications	(647)	229	(51)
(Gains) losses reclassified out of AOCI	2	3	6
Tax benefit (expense)	(44)	(2)	(5)
Balance, end of period	(1,287)	(598)	(828)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of period	(417)	(519)	(792)
Balance, end of period	$ (1,622)	$ (417)	$ (519)