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Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions | 12 Months Ended
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Sep. 29, 2018 USD ($) Item | Sep. 30, 2017 USD ($) | Sep. 24, 2016 USD ($)
Significant Accounting Policies [Line Items] |  |  |
Deliverables in arrangements (up to) | Item | 3 |  |
Depreciation and amortization expense | $ 9,300 | $ 8,200 | $ 8,300
Non-cash investing activities involving property, plant and equipment, net increase to accounts payable and other current liabilities | $ 3,400 |  |
Accounting Standards Update 2016-09 |  |  |
Significant Accounting Policies [Line Items] |  |  |
Increase to cash provided by operating activities |  | $ 627 | $ 407
Building | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, estimated useful life | 30 years |  |
Machinery and Equipment | Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, estimated useful life | 1 year |  |
Machinery and Equipment | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, estimated useful life | 5 years |  |
Internal-Use Software | Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, estimated useful life | 3 years |  |
Internal-Use Software | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, estimated useful life | 5 years |  |

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