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Financing Receivables and Operating Leases (Schedule of Contractual Maturities of Gross Lease Receivables) (Details)
$ in Millions
Jul. 28, 2018
USD ($)
Financing Receivables And Guarantees [Abstract]  
2019 $ 1,311
2020 745
2021 415
2022 177
2023 12
Thereafter 28
Total $ 2,688