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Business And Geographic Segment Information Business And Geographic Segment Information (Geographic Information, Long-lived Assets) (Details) - USD ($)
$ in Millions
Jul. 28, 2019
Jul. 29, 2018
Jul. 30, 2017
Segment Reporting Information [Line Items]      
Plant assets, net of depreciation $ 2,455 $ 2,466 $ 1,644
UNITED STATES      
Segment Reporting Information [Line Items]      
Plant assets, net of depreciation 2,400 2,363 1,547
Other Countries [Member]      
Segment Reporting Information [Line Items]      
Plant assets, net of depreciation $ 55 $ 103 $ 97