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Leases - Operating Lease Assets (Details) - USD ($) $ in Millions	Jul. 31, 2021	Jul. 25, 2020
Leases [Abstract]
Operating lease assets	$ 273	$ 337
Accumulated depreciation	(165)	(198)
Operating lease assets, net	$ 108	$ 139

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Amount of accumulated depreciation of lessor's underlying asset for which right to use has been conveyed to lessee under operating lease.

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Amount, before accumulated depreciation, of lessor's underlying asset for which right to use has been conveyed to lessee under operating lease.

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