Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 23, 2021	Jan. 25, 2020	Jan. 23, 2021	Jan. 25, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 2,545	$ 2,878	$ 4,719	$ 5,804
Available-for-sale investments:
Change in net unrealized gains and losses, net of tax benefit (expense) of $0 and $17 for the second quarter and first six months of fiscal 2021, respectively, and $(15) and $(29) for the corresponding periods of fiscal 2020, respectively	6	66	(18)	139
Net (gains) losses reclassified into earnings, net of tax (benefit) expense of $2 and $7 for the second quarter and first six months of fiscal 2021, respectively and $7 and $12 for the corresponding periods of fiscal 2020, respectively	(7)	(4)	(17)	(9)
Total- Available-for-sale investments	(1)	62	(35)	130
Cash flow hedging instruments:
Change in unrealized gains and losses, net of tax benefit (expense) of $1 for each of the second quarter and first six months of fiscal 2021, and $0 and $1 for the corresponding periods of fiscal 2020, respectively	(2)	1	(4)	1
Net (gains) losses reclassified into earnings, net of tax (benefit) expense of $0 and $1 for the second quarter and first six months of fiscal 2021, respectively, and $0 for each of the corresponding periods of fiscal 2020	(3)	2	(4)	2
Total- Cash flow hedging instruments	(5)	3	(8)	3
Net change in cumulative translation adjustment and actuarial gains and losses net of tax benefit (expense) of $(2) and $(3) for the second quarter and first six months of fiscal 2021, respectively, and $(1) for each of the corresponding periods of fiscal 2020	235	50	344	(41)
Other comprehensive income	229	115	301	92
Comprehensive income	$ 2,774	$ 2,993	$ 5,020	$ 5,896