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Income Taxes - Reconciliation of the Provision for Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |
Computed expected tax | $ 13,805 | $ 17,890 | $ 22,431
State taxes, net of federal effect | 423 | 271 | 185
Impacts of the Act | 0 | 1,515 | 0
Earnings of foreign subsidiaries | (2,625) | (5,606) | (6,135)
Research and development credit, net | (548) | (560) | (678)
Excess tax benefits from equity awards | (639) | (675) | 0
Other | 65 | 537 | (65)
Provision for income taxes | $ 10,481 | $ 13,372 | $ 15,738
Effective tax rate | 15.90% | 18.30% | 24.60%

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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117330312&loc=d3e23163-113944 + Details
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- Definition Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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