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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 30, 2019 | Mar. 30, 2019 | Dec. 30, 2018 | Sep. 30, 2018 | Sep. 29, 2018 | Dec. 31, 2017 | Oct. 01, 2017
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Reduction to other non-current assets upon adoption of ASU 2016-16 | $ (34,587) | $ (34,587) |  |  | $ (22,283) |  |
Potentially dilutive securities excluded from the computation of diluted earnings per share because their effect would have been antidilutive (in shares) | 31.1 | 30.0 |  |  |  |  |
Retained earnings |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Increase to retained earnings upon adoption of ASU 2016-16 |  |  | $ 0 | $ 2,501 |  | $ 278 | $ 278
Accounting Standards Update 2016-16 |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Increase to net deferred tax assets upon adoption of ASU 2016-16 |  |  |  | 2,700 |  |  |
Reduction to other non-current assets upon adoption of ASU 2016-16 |  |  |  | 128 |  |  |
Accounting Standards Update 2016-16 | Retained earnings |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Increase to retained earnings upon adoption of ASU 2016-16 |  |  |  | $ 2,600 |  |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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