Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Oct. 24, 2020	Oct. 26, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 2,174	$ 2,926
Available-for-sale investments:
Change in net unrealized gains and losses, net of tax benefit (expense) of $17 and $(14) for the first quarter of fiscal 2021 and 2020, respectively	(24)	73
Net (gains) losses reclassified into earnings, net of tax (benefit) expense of $5 for each of the first quarter of fiscal 2021 and 2020	(10)	(5)
Total- Available-for-sale investments	(34)	68
Cash flow hedging instruments:
Change in unrealized gains and losses, net of tax benefit (expense) of $0 and $1 for the first quarter of fiscal 2021 and 2020, respectively	(2)	0
Net (gains) losses reclassified into earnings, net of tax (benefit) expense of $1 and $0 for the first quarter of fiscal 2021 and 2020, respectively	(1)	0
Total- Cash flow hedging instruments	(3)	0
Net change in cumulative translation adjustment and actuarial gains and losses net of tax benefit (expense) of $(1) and $0 for the first quarter of fiscal 2021 and 2020, respectively	109	(91)
Other comprehensive income (loss)	72	(23)
Comprehensive income	$ 2,246	$ 2,903