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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 | Mar. 28, 2020 | Dec. 29, 2019 | Sep. 29, 2019 | Dec. 30, 2018 | Sep. 30, 2018
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Right-of-use assets recorded upon adoption of new leases standard |  |  | $ 8,728 |  |  |  |
Lease liabilities recorded upon adoption of new leases standard |  |  | $ 9,254 |  |  |  |
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 |  |  |  |  |
Accumulated other comprehensive income/(loss) |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Increase in AOCI and decrease in retained earnings upon adoption of ASU 2017-12 |  |  |  | $ 0 | $ 136 | $ 0 | $ 89
Retained earnings |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Increase in AOCI and decrease in retained earnings upon adoption of ASU 2017-12 |  |  |  | $ 0 | (136) | $ 0 | $ 2,501
Accounting Standards Update 2016-02 |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Right-of-use assets recorded upon adoption of new leases standard |  |  |  |  | 7,500 |  |
Lease liabilities recorded upon adoption of new leases standard |  |  |  |  | 8,100 |  |
Accounting Standards Update 2017-12 | Accumulated other comprehensive income/(loss) |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Increase in AOCI and decrease in retained earnings upon adoption of ASU 2017-12 |  |  |  |  | 136 |  |
Accounting Standards Update 2017-12 | Retained earnings |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Increase in AOCI and decrease in retained earnings upon adoption of ASU 2017-12 |  |  |  |  | $ (136) |  |

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- Definition Present value of lessee's discounted obligation for lease payments from operating and finance leases. + References No definition available. + Details
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