Accumulated Other Comprehensive Income (Loss) - AOCI Components (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 27, 2024	Jul. 29, 2023	Jul. 30, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of period	$ 44,353	$ 39,773	$ 41,275
Other comprehensive income (loss) before reclassifications	206	32	(1,291)
(Gains) losses reclassified out of AOCI	16	(43)	(36)
Tax benefit (expense)	(77)	58	122
Balance, end of period	45,457	44,353	39,773
Net Unrealized Gains (Losses) on Available-for-Sale Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of period	(440)	(379)	182
Other comprehensive income (loss) before reclassifications	193	(113)	(731)
(Gains) losses reclassified out of AOCI	67	21	(9)
Tax benefit (expense)	(61)	31	179
Balance, end of period	(241)	(440)	(379)
Net Unrealized Gains (Losses) Cash Flow Hedging Instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of period	18	44	(1)
Other comprehensive income (loss) before reclassifications	128	29	87
(Gains) losses reclassified out of AOCI	(49)	(63)	(29)
Tax benefit (expense)	(18)	8	(13)
Balance, end of period	79	18	44
Cumulative Translation Adjustment and Actuarial Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of period	(1,153)	(1,287)	(598)
Other comprehensive income (loss) before reclassifications	(115)	116	(647)
(Gains) losses reclassified out of AOCI	(2)	(1)	2
Tax benefit (expense)	2	19	(44)
Balance, end of period	(1,268)	(1,153)	(1,287)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of period	(1,575)	(1,622)	(417)
Balance, end of period	$ (1,430)	$ (1,575)	$ (1,622)