XML 87 R69.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Commitments, Contingencies and Related Parties Additional Information (Details Textuals) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 29, 2018 | Jun. 30, 2017 | Jul. 01, 2016
Related Party Transactions [Abstract] |  |  |
Investment funding commitments | 50.00% |  |
Payments for equity method investments | $ 0 | $ (20) | $ 0
Accounts payable to related parties | 259 | 206 |
Retained earnings, undistributed earnings from equity method investees | $ 8 | 5 |
Western Digital Corp |  |  |
Related Party Transactions [Abstract] |  |  |
Start-up cost commitment | 50.00% |  |
Investment funding commitments | 50.00% |  |
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 | $ (3,790) | (2,640) |
Accounts payable to related parties | $ 259 | $ 206 |
Flash Ventures |  |  |
Related Party Transactions [Abstract] |  |  |
Equity method investment, ownership percentage | 49.90% |  |
Unis Venture |  |  |
Related Party Transactions [Abstract] |  |  |
Equity method investment, ownership percentage | 49.00% |  |
Toshiba Memory Corporation (TMC) | Flash Ventures |  |  |
Related Party Transactions [Abstract] |  |  |
Partner's ownership in venture business | 50.10% |  |
Unissoft (Wuxi) Group Co Ltd. | Unis Venture |  |  |
Related Party Transactions [Abstract] |  |  |
Partner's ownership in venture business | 51.00% |  |

X
- Definition Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_AccountsPayableRelatedPartiesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireEquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of consolidated retained earnings that represent undistributed (not yet received) earnings from 50% or less owned persons accounted for by the equity method (equity method investees). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6462270&loc=d3e57205-112772 + Details
Name: | us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Percent of commitment by the Company to fund a venture's investment in situations where the venture's sales are insufficient to cover the investments. + References No definition available. + Details
Name: | wdc_InvestmentFundingCommitments
Namespace Prefix: | wdc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Partner's ownership in venture business. + References No definition available. + Details
Name: | wdc_PartnersOwnershipInVentureBusiness
Namespace Prefix: | wdc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Start-up Cost Commitment + References No definition available. + Details
Name: | wdc_StartupCostCommitment
Namespace Prefix: | wdc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | wdc_EquityMethodInvestorNameAxis=wdc_WesternDigitalCorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_EquityMethodInvesteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=wdc_FlashVenturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=wdc_UnisVentureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=wdc_ToshibaMemoryCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=wdc_UnissoftWuxiGroupCoLtd.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |