Recent Accounting Pronouncements Recent Accounting Pronouncements - Additional Details (Details) $ in Millions	Jan. 01, 2016 USD ($)
Recent Accounting Pronouncements [Abstract]
Net Deferred Tax Assets	$ 165

Current deferred tax asset balance transferred from current to non-current due to early adoption of Accounting Standards Update 2015-17, applied prospectively.

No definition available.

Name:	wdc_NetDeferredTaxAssets
Namespace Prefix:	wdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant