Fair Value - Assets and Liabilities Measured At Fair Value On Recurring Basis (Details) - USD ($) $ in Millions	Jul. 30, 2022	Jul. 31, 2021
Assets:
Available-for-sale debt investments	$ 11,947	$ 15,206
Marketable equity securities	241	137
Derivative assets	78	126
Total	17,813	22,327
Liabilities:
Derivative liabilities	89	20
Total	89	20
Money market funds
Assets:
Money market funds	1,500	750
U.S. government securities
Assets:
Available-for-sale debt investments	1,238	1,794
U.S. government agency securities
Assets:
Available-for-sale debt investments	138	152
Non-U.S. government and agency securities
Assets:
Available-for-sale debt investments	272	3
Corporate debt securities
Assets:
Available-for-sale debt investments	7,818	8,910
U.S. agency mortgage-backed securities
Assets:
Available-for-sale debt investments	1,976	2,862
Commercial paper
Assets:
Available-for-sale debt investments	255	1,190
Certificates of deposit
Assets:
Available-for-sale debt investments	250	295
Money market funds
Assets:
Cash equivalents	3,930	5,694
Commercial paper
Assets:
Cash equivalents	72	114
Certificates of deposit
Assets:
Cash equivalents	32	0
U.S. government securities
Assets:
Cash equivalents	12	300
Corporate debt securities
Assets:
Cash equivalents	1	0
Level 1
Assets:
Marketable equity securities	241	137
Derivative assets	0	0
Total	5,671	6,581
Liabilities:
Derivative liabilities	0	0
Total	0	0
Level 1 \| Money market funds
Assets:
Money market funds	1,500	750
Level 1 \| U.S. government securities
Assets:
Available-for-sale debt investments	0	0
Level 1 \| U.S. government agency securities
Assets:
Available-for-sale debt investments	0	0
Level 1 \| Non-U.S. government and agency securities
Assets:
Available-for-sale debt investments	0	0
Level 1 \| Corporate debt securities
Assets:
Available-for-sale debt investments	0	0
Level 1 \| U.S. agency mortgage-backed securities
Assets:
Available-for-sale debt investments	0	0
Level 1 \| Commercial paper
Assets:
Available-for-sale debt investments	0	0
Level 1 \| Certificates of deposit
Assets:
Available-for-sale debt investments	0	0
Level 1 \| Money market funds
Assets:
Cash equivalents	3,930	5,694
Level 1 \| Commercial paper
Assets:
Cash equivalents	0	0
Level 1 \| Certificates of deposit
Assets:
Cash equivalents	0	0
Level 1 \| U.S. government securities
Assets:
Cash equivalents	0	0
Level 1 \| Corporate debt securities
Assets:
Cash equivalents	0	0
Level 2
Assets:
Marketable equity securities	0	0
Derivative assets	78	126
Total	12,142	15,746
Liabilities:
Derivative liabilities	89	20
Total	89	20
Level 2 \| Money market funds
Assets:
Money market funds	0	0
Level 2 \| U.S. government securities
Assets:
Available-for-sale debt investments	1,238	1,794
Level 2 \| U.S. government agency securities
Assets:
Available-for-sale debt investments	138	152
Level 2 \| Non-U.S. government and agency securities
Assets:
Available-for-sale debt investments	272	3
Level 2 \| Corporate debt securities
Assets:
Available-for-sale debt investments	7,818	8,910
Level 2 \| U.S. agency mortgage-backed securities
Assets:
Available-for-sale debt investments	1,976	2,862
Level 2 \| Commercial paper
Assets:
Available-for-sale debt investments	255	1,190
Level 2 \| Certificates of deposit
Assets:
Available-for-sale debt investments	250	295
Level 2 \| Money market funds
Assets:
Cash equivalents	0	0
Level 2 \| Commercial paper
Assets:
Cash equivalents	72	114
Level 2 \| Certificates of deposit
Assets:
Cash equivalents	32	0
Level 2 \| U.S. government securities
Assets:
Cash equivalents	12	300
Level 2 \| Corporate debt securities
Assets:
Cash equivalents	$ 1	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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