Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 25, 2020	Apr. 27, 2019	Apr. 25, 2020	Apr. 27, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 2,774	$ 3,044	$ 8,578	$ 9,415
Available-for-sale investments:
Change in net unrealized gains and losses, net of tax benefit (expense) of $3 and $(26) for the third quarter and first nine months of fiscal 2020, respectively, and $(64) and $(63) for the corresponding periods of fiscal 2019, respectively	4	232	143	319
Net (gains) losses reclassified into earnings, net of tax (benefit) expense of $2 and $14 for the third quarter and first nine months of fiscal 2020, respectively, and $5 and $4 for the corresponding periods of fiscal 2019, respectively	3	12	(6)	22
Total- Available-for-sale investments	7	244	137	341
Cash flow hedging instruments:
Change in unrealized gains and losses, net of tax benefit (expense) of $(2) and $(1) for the third quarter and first nine months of fiscal 2020, respectively, and $(2) and $0 for the corresponding periods of fiscal 2019, respectively	12		13
Change in unrealized gains and losses, net of tax benefit (expense) of $(2) and $(1) for the third quarter and first nine months of fiscal 2020, respectively, and $(2) and $0 for the corresponding periods of fiscal 2019, respectively		10		3
Net (gains) losses reclassified into earnings, net of tax (benefit) expense of $0 for each of the third quarter and first nine months of fiscal 2020, respectively, and $0 for each of the corresponding periods of fiscal 2019	(1)		1
Net (gains) losses reclassified into earnings, net of tax (benefit) expense of $0 for each of the third quarter and first nine months of fiscal 2020, respectively, and $0 for each of the corresponding periods of fiscal 2019		0		(1)
Total- Cash flow hedging instruments	11		14
Total- Cash flow hedging instruments		10		2
Net change in cumulative translation adjustment and actuarial gains and losses net of tax benefit (expense) of $3 and $2 for the third quarter and first nine months of fiscal 2020, respectively, and $(1) and $(2) for the corresponding periods of fiscal 2019, respectively	(427)	(40)	(468)	(222)
Other comprehensive income (loss)	(409)	214	(317)	121
Comprehensive income	$ 2,365	$ 3,258	$ 8,261	$ 9,536