Accumulated Other Comprehensive Income (Loss) - AOCI Components (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 26, 2025	Jul. 27, 2024	Jul. 29, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of period	$ 45,457	$ 44,353	$ 39,773
Other comprehensive income (loss) before reclassifications	485	206	32
(Gains) losses reclassified out of AOCI	53	16	(43)
Tax benefit (expense)	(62)	(77)	58
Balance, end of period	46,843	45,457	44,353
Net Unrealized Gains (Losses) on Available-for-Sale Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of period	(241)	(440)	(379)
Other comprehensive income (loss) before reclassifications	152	193	(113)
(Gains) losses reclassified out of AOCI	100	67	21
Tax benefit (expense)	(68)	(61)	31
Balance, end of period	(57)	(241)	(440)
Net Unrealized Gains (Losses) Cash Flow Hedging Instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of period	79	18	44
Other comprehensive income (loss) before reclassifications	29	128	29
(Gains) losses reclassified out of AOCI	(47)	(49)	(63)
Tax benefit (expense)	4	(18)	8
Balance, end of period	65	79	18
Cumulative Translation Adjustment and Actuarial Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of period	(1,268)	(1,153)	(1,287)
Other comprehensive income (loss) before reclassifications	304	(115)	116
(Gains) losses reclassified out of AOCI	0	(2)	(1)
Tax benefit (expense)	2	2	19
Balance, end of period	(962)	(1,268)	(1,153)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of period	(1,430)	(1,575)	(1,622)
Balance, end of period	$ (954)	$ (1,430)	$ (1,575)