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Borrowings - Schedule of Long-Term Debt (Details) - USD ($) $ in Millions	Jul. 31, 2021	Jul. 25, 2020
Debt Instrument [Line Items]
Total	$ 11,500	$ 14,500
Unaccreted discount/issuance costs	(80)	(88)
Hedge accounting fair value adjustments	106	171
Total	11,526	14,583
Short-term debt	2,508	3,005
Long-term debt	$ 9,018	$ 11,578
Fixed-Rate Notes, 2.20%, Due February 28, 2021
Debt Instrument [Line Items]
Interest rate, stated percentage		2.20%
Senior notes		$ 2,500
Effective Rate		2.30%
Fixed-Rate Notes, 2.90%, Due March 4, 2021
Debt Instrument [Line Items]
Interest rate, stated percentage		2.90%
Senior notes		$ 500
Effective Rate		0.94%
Fixed Rate Notes, 1.85% Due September 20, 2021
Debt Instrument [Line Items]
Interest rate, stated percentage	1.85%
Senior notes	$ 2,000	$ 2,000
Effective Rate	1.90%	1.90%
Fixed-Rate Notes, 3.00%, Due June 15, 2022
Debt Instrument [Line Items]
Interest rate, stated percentage	3.00%
Senior notes	$ 500	$ 500
Effective Rate	1.13%	1.21%
Fixed-Rate Notes, 2.60%, Due February 28, 2023
Debt Instrument [Line Items]
Interest rate, stated percentage	2.60%
Senior notes	$ 500	$ 500
Effective Rate	2.68%	2.68%
Fixed Rate Notes, 2.20%, Due September 20, 2023
Debt Instrument [Line Items]
Interest rate, stated percentage	2.20%
Senior notes	$ 750	$ 750
Effective Rate	2.27%	2.27%
Fixed-Rate Notes,3.625%, Due March 4, 2024
Debt Instrument [Line Items]
Interest rate, stated percentage	3.625%
Senior notes	$ 1,000	$ 1,000
Effective Rate	1.00%	1.06%
Fixed-Rate Notes,3.50%, Due June 15, 2025
Debt Instrument [Line Items]
Interest rate, stated percentage	3.50%
Senior notes	$ 500	$ 500
Effective Rate	1.29%	1.37%
Fixed-Rate Notes,2.95%, Due February 28, 2026
Debt Instrument [Line Items]
Interest rate, stated percentage	2.95%
Senior notes	$ 750	$ 750
Effective Rate	3.01%	3.01%
Fixed Rate Notes, 2.50%, Due September 20, 2026
Debt Instrument [Line Items]
Interest rate, stated percentage	2.50%
Senior notes	$ 1,500	$ 1,500
Effective Rate	2.55%	2.55%
Fixed-Rate Notes, 5.90%, Due February 15, 2039
Debt Instrument [Line Items]
Interest rate, stated percentage	5.90%
Senior notes	$ 2,000	$ 2,000
Effective Rate	6.11%	6.11%
Fixed-Rate Notes, 5.50%, Due January 15, 2040
Debt Instrument [Line Items]
Interest rate, stated percentage	5.50%
Senior notes	$ 2,000	$ 2,000
Effective Rate	5.67%	5.67%

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