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Financing Receivables - Schedule of Financing Receivables Categorized by Internal Credit Risk Rating (Details) - USD ($)
$ in Millions
Oct. 24, 2020
Jul. 25, 2020
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross $ 10,656 $ 10,780
Lease Receivables    
Financing Receivable, Credit Quality Indicator [Line Items]    
Origination year - Prior 38  
Origination year - Fiscal Year 2017 128  
Origination year - Fiscal Year 2018 326  
Origination year - Fiscal Year 2019 584  
Origination year - Fiscal Year 2020 799  
Origination year - Fiscal Year 2021 83  
Gross 1,958 2,013
Loan Receivables    
Financing Receivable, Credit Quality Indicator [Line Items]    
Origination year - Prior 49  
Origination year - Fiscal Year 2017 260  
Origination year - Fiscal Year 2018 641  
Origination year - Fiscal Year 2019 1,386  
Origination year - Fiscal Year 2020 2,379  
Origination year - Fiscal Year 2021 1,239  
Gross 5,954 5,937
Financed Service Contracts    
Financing Receivable, Credit Quality Indicator [Line Items]    
Origination year - Prior 6  
Origination year - Fiscal Year 2017 92  
Origination year - Fiscal Year 2018 164  
Origination year - Fiscal Year 2019 547  
Origination year - Fiscal Year 2020 1,033  
Origination year - Fiscal Year 2021 902  
Gross 2,744 2,830
1 to 4    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross   6,445
1 to 4 | Lease Receivables    
Financing Receivable, Credit Quality Indicator [Line Items]    
Origination year - Prior 17  
Origination year - Fiscal Year 2017 60  
Origination year - Fiscal Year 2018 166  
Origination year - Fiscal Year 2019 263  
Origination year - Fiscal Year 2020 389  
Origination year - Fiscal Year 2021 25  
Gross 920 992
1 to 4 | Loan Receivables    
Financing Receivable, Credit Quality Indicator [Line Items]    
Origination year - Prior 30  
Origination year - Fiscal Year 2017 170  
Origination year - Fiscal Year 2018 458  
Origination year - Fiscal Year 2019 858  
Origination year - Fiscal Year 2020 1,430  
Origination year - Fiscal Year 2021 793  
Gross 3,739 3,808
1 to 4 | Financed Service Contracts    
Financing Receivable, Credit Quality Indicator [Line Items]    
Origination year - Prior 4  
Origination year - Fiscal Year 2017 56  
Origination year - Fiscal Year 2018 88  
Origination year - Fiscal Year 2019 246  
Origination year - Fiscal Year 2020 555  
Origination year - Fiscal Year 2021 634  
Gross 1,583 1,645
5 to 6    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross   4,066
5 to 6 | Lease Receivables    
Financing Receivable, Credit Quality Indicator [Line Items]    
Origination year - Prior 17  
Origination year - Fiscal Year 2017 65  
Origination year - Fiscal Year 2018 151  
Origination year - Fiscal Year 2019 300  
Origination year - Fiscal Year 2020 389  
Origination year - Fiscal Year 2021 54  
Gross 976 952
5 to 6 | Loan Receivables    
Financing Receivable, Credit Quality Indicator [Line Items]    
Origination year - Prior 16  
Origination year - Fiscal Year 2017 87  
Origination year - Fiscal Year 2018 174  
Origination year - Fiscal Year 2019 456  
Origination year - Fiscal Year 2020 887  
Origination year - Fiscal Year 2021 441  
Gross 2,061 1,961
5 to 6 | Financed Service Contracts    
Financing Receivable, Credit Quality Indicator [Line Items]    
Origination year - Prior 2  
Origination year - Fiscal Year 2017 36  
Origination year - Fiscal Year 2018 73  
Origination year - Fiscal Year 2019 285  
Origination year - Fiscal Year 2020 465  
Origination year - Fiscal Year 2021 267  
Gross 1,128 1,153
7 and Higher    
Financing Receivable, Credit Quality Indicator [Line Items]    
Gross   269
7 and Higher | Lease Receivables    
Financing Receivable, Credit Quality Indicator [Line Items]    
Origination year - Prior 4  
Origination year - Fiscal Year 2017 3  
Origination year - Fiscal Year 2018 9  
Origination year - Fiscal Year 2019 21  
Origination year - Fiscal Year 2020 21  
Origination year - Fiscal Year 2021 4  
Gross 62 69
7 and Higher | Loan Receivables    
Financing Receivable, Credit Quality Indicator [Line Items]    
Origination year - Prior 3  
Origination year - Fiscal Year 2017 3  
Origination year - Fiscal Year 2018 9  
Origination year - Fiscal Year 2019 72  
Origination year - Fiscal Year 2020 62  
Origination year - Fiscal Year 2021 5  
Gross 154 168
7 and Higher | Financed Service Contracts    
Financing Receivable, Credit Quality Indicator [Line Items]    
Origination year - Prior 0  
Origination year - Fiscal Year 2017 0  
Origination year - Fiscal Year 2018 3  
Origination year - Fiscal Year 2019 16  
Origination year - Fiscal Year 2020 13  
Origination year - Fiscal Year 2021 1  
Gross $ 33 $ 32