Commitments and Contingencies (Schedule of Purchase Commitments) (Details) - USD ($) $ in Millions	Jan. 26, 2019	Jul. 28, 2018
Commitments and Contingencies Disclosure [Abstract]
Less than 1 year	$ 5,366	$ 5,407
1 to 3 years	731	710
3 to 5 years	180	360
Total	$ 6,277	$ 6,477

Minimum amount of purchase arrangement maturing in the remainder of the fiscal year following the latest fiscal year ended. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

No definition available.

Name:	us-gaap_PurchaseObligationFutureMinimumPaymentsRemainderOfFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant