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Recent Accounting Pronouncements - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jul. 03, 2020 | Jun. 29, 2019 | Jun. 28, 2019 | Jun. 29, 2018 | Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Increase in lease assets | $ 230 |  |  |  |
Increase in lease liabilities | 245 |  |  |  |
Cumulative adjustment to retained earnings | $ 9,551 |  | $ 9,967 | $ 11,531 | $ 11,418
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201602Member |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Transition Option Elected [Extensible List] | wdc:AccountingStandardsUpdate201602ProspectiveMember |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative adjustment to retained earnings |  |  | (5) | 56 | 51
Retained Earnings |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative adjustment to retained earnings | $ 6,725 |  | 7,449 | 8,757 | 8,633
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative adjustment to retained earnings |  |  | $ (5) | $ 56 | $ 70
Accounting Standards Update 2016-02 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Increase in lease assets |  | $ 221 |  |  |
Increase in lease liabilities |  | 221 |  |  |
Accounting Standards Update 2016-02 | Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative adjustment to retained earnings |  | $ (5) |  |  |

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