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Financing Receivables and Operating Leases - Schedule of Financing Receivables (Details) - USD ($) $ in Millions | Jul. 27, 2019 | Jul. 28, 2018 | Jul. 29, 2017 | Jul. 30, 2016
--- | --- | --- | --- | ---
Financing Receivables [Line Items] |  |  |  |
Gross | $ 10,174 | $ 10,013 |  |
Residual value | 142 | 164 |  |
Unearned income | (137) | (141) |  |
Allowance for credit loss | (126) | (205) | $ (295) | $ (375)
Reported as: |  |  |  |
Current | 5,095 | 4,949 |  |
Noncurrent | 4,958 | 4,882 |  |
Total, net | 10,053 | 9,831 |  |
Lease Receivables |  |  |  |
Financing Receivables [Line Items] |  |  |  |
Gross | 2,367 | 2,688 |  |
Residual value | 142 | 164 |  |
Unearned income | (137) | (141) |  |
Allowance for credit loss | (46) | (135) | (162) | (230)
Reported as: |  |  |  |
Current | 1,029 | 1,249 |  |
Noncurrent | 1,297 | 1,327 |  |
Total, net | 2,326 | 2,576 |  |
Loan Receivables |  |  |  |
Financing Receivables [Line Items] |  |  |  |
Gross | 5,438 | 4,999 |  |
Residual value | 0 | 0 |  |
Unearned income | 0 | 0 |  |
Allowance for credit loss | (71) | (60) | (103) | (97)
Reported as: |  |  |  |
Current | 2,653 | 2,376 |  |
Noncurrent | 2,714 | 2,563 |  |
Total, net | 5,367 | 4,939 |  |
Financed Service Contracts |  |  |  |
Financing Receivables [Line Items] |  |  |  |
Gross | 2,369 | 2,326 |  |
Residual value | 0 | 0 |  |
Unearned income | 0 | 0 |  |
Allowance for credit loss | (9) | (10) | $ (30) | $ (48)
Reported as: |  |  |  |
Current | 1,413 | 1,324 |  |
Noncurrent | 947 | 992 |  |
Total, net | $ 2,360 | $ 2,316 |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The estimate of the lease property's economic value at the end of the sales-type lease term excluding any amounts guaranteed by either the lessee or a third-party. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84165051&loc=d3e45377-112738 + Details
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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 + Details
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- Definition Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84165051&loc=d3e45377-112738 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159169&loc=d3e10152-111534 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 + Details
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