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Financing Receivables - Schedule of Financing Receivables Categorized by Internal Credit Risk Rating (Details) - USD ($)
$ in Millions
Jan. 23, 2021
Jul. 25, 2020
Financing Receivable, Credit Quality Indicator [Line Items]    
Origination year - Prior $ 54  
Origination year - Fiscal Year 2017 373  
Origination year - Fiscal Year 2018 930  
Origination year - Fiscal Year 2019 2,196  
Origination year - Fiscal Year 2020 3,695  
Origination year - Fiscal Year 2021 2,912  
Gross 10,160 $ 10,780
Lease Receivables    
Financing Receivable, Credit Quality Indicator [Line Items]    
Origination year - Prior 28  
Origination year - Fiscal Year 2017 99  
Origination year - Fiscal Year 2018 280  
Origination year - Fiscal Year 2019 532  
Origination year - Fiscal Year 2020 711  
Origination year - Fiscal Year 2021 118  
Gross 1,768 2,013
Loan Receivables    
Financing Receivable, Credit Quality Indicator [Line Items]    
Origination year - Prior 23  
Origination year - Fiscal Year 2017 204  
Origination year - Fiscal Year 2018 540  
Origination year - Fiscal Year 2019 1,201  
Origination year - Fiscal Year 2020 2,105  
Origination year - Fiscal Year 2021 1,744  
Gross 5,817 5,937
Financed Service Contracts    
Financing Receivable, Credit Quality Indicator [Line Items]    
Origination year - Prior 3  
Origination year - Fiscal Year 2017 70  
Origination year - Fiscal Year 2018 110  
Origination year - Fiscal Year 2019 463  
Origination year - Fiscal Year 2020 879  
Origination year - Fiscal Year 2021 1,050  
Gross 2,575 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 10  
Origination year - Fiscal Year 2017 49  
Origination year - Fiscal Year 2018 153  
Origination year - Fiscal Year 2019 248  
Origination year - Fiscal Year 2020 331  
Origination year - Fiscal Year 2021 16  
Gross 807 992
1 to 4 | Loan Receivables    
Financing Receivable, Credit Quality Indicator [Line Items]    
Origination year - Prior 16  
Origination year - Fiscal Year 2017 141  
Origination year - Fiscal Year 2018 387  
Origination year - Fiscal Year 2019 774  
Origination year - Fiscal Year 2020 1,302  
Origination year - Fiscal Year 2021 1,053  
Gross 3,673 3,808
1 to 4 | Financed Service Contracts    
Financing Receivable, Credit Quality Indicator [Line Items]    
Origination year - Prior 2  
Origination year - Fiscal Year 2017 49  
Origination year - Fiscal Year 2018 51  
Origination year - Fiscal Year 2019 213  
Origination year - Fiscal Year 2020 455  
Origination year - Fiscal Year 2021 742  
Gross 1,512 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 15  
Origination year - Fiscal Year 2017 48  
Origination year - Fiscal Year 2018 121  
Origination year - Fiscal Year 2019 270  
Origination year - Fiscal Year 2020 360  
Origination year - Fiscal Year 2021 98  
Gross 912 952
5 to 6 | Loan Receivables    
Financing Receivable, Credit Quality Indicator [Line Items]    
Origination year - Prior 5  
Origination year - Fiscal Year 2017 60  
Origination year - Fiscal Year 2018 145  
Origination year - Fiscal Year 2019 362  
Origination year - Fiscal Year 2020 745  
Origination year - Fiscal Year 2021 672  
Gross 1,989 1,961
5 to 6 | Financed Service Contracts    
Financing Receivable, Credit Quality Indicator [Line Items]    
Origination year - Prior 1  
Origination year - Fiscal Year 2017 21  
Origination year - Fiscal Year 2018 57  
Origination year - Fiscal Year 2019 235  
Origination year - Fiscal Year 2020 412  
Origination year - Fiscal Year 2021 305  
Gross 1,031 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 3  
Origination year - Fiscal Year 2017 2  
Origination year - Fiscal Year 2018 6  
Origination year - Fiscal Year 2019 14  
Origination year - Fiscal Year 2020 20  
Origination year - Fiscal Year 2021 4  
Gross 49 69
7 and Higher | Loan Receivables    
Financing Receivable, Credit Quality Indicator [Line Items]    
Origination year - Prior 2  
Origination year - Fiscal Year 2017 3  
Origination year - Fiscal Year 2018 8  
Origination year - Fiscal Year 2019 65  
Origination year - Fiscal Year 2020 58  
Origination year - Fiscal Year 2021 19  
Gross 155 168
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 2  
Origination year - Fiscal Year 2019 15  
Origination year - Fiscal Year 2020 12  
Origination year - Fiscal Year 2021 3  
Gross $ 32 $ 32