Related Parties and Related Commitments and Contingencies - Additional Information (Details) $ in Millions	12 Months Ended
	Jul. 03, 2020 USD ($) legalEntity	Jun. 28, 2019 USD ($)	Jun. 29, 2018 USD ($)
Related Party Transactions [Abstract]
Number of legal entities | legalEntity	3
Accounts payable to related parties	$ 407	$ 331
Undistributed earnings	$ 24	$ 14
Investment funding commitments	50.00%
Percent of total manufacturing capacity in operation		100.00%
Costs incurred associated with reduction in utilization		$ 264
Costs incurred with unexpected power outage incident	$ 68	145
Western Digital Corp | Minimum
Related Party Transactions [Abstract]
Investment funding commitments	49.90%
Western Digital Corp | Maximum
Related Party Transactions [Abstract]
Investment funding commitments	50.00%
Equity Method Investee
Related Party Transactions [Abstract]
Payments for equity method investments	$ 3,090	4,130	$ 3,790
Accounts payable to related parties	$ 407	$ 331
Flash Ventures
Related Party Transactions [Abstract]
Equity method investment, ownership percentage	49.90%
Remaining committed prepayments	$ 206
Unis Venture
Related Party Transactions [Abstract]
Equity method investment, ownership percentage	49.00%
Kioxia
Related Party Transactions [Abstract]
Equity method investment, ownership percentage	49.90%
Unissoft (Wuxi) Group Co Ltd. | Unis Venture
Related Party Transactions [Abstract]
Partner's ownership in venture business	51.00%
Kioxia | Flash Ventures
Related Party Transactions [Abstract]
Equity method investment, ownership percentage	50.10%
Prepayments of Future Depreciation | Flash Ventures
Related Party Transactions [Abstract]
Other commitment	$ 360
Other commitment, period	3 years
Revenue from Contract with Customer | Unis Venture | Product Concentration Risk
Related Party Transactions [Abstract]
Concentration risk, percentage	2.00%	2.00%
Accounts Receivable Benchmark | Unis Venture | Product Concentration Risk
Related Party Transactions [Abstract]
Concentration risk, percentage		5.00%