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Benefit Plans - Additional Information (Details) | 12 Months Ended |
--- | --- | ---
Sep. 28, 2019 USD ($) shares | Sep. 29, 2018 USD ($) shares | Sep. 30, 2017 USD ($) shares | Mar. 29, 2014 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum portion of pre-tax earnings under 401(k) Plan that can be deferred by participating U.S. employees | $ 19,000 |  |  |
Taxes paid related to net share settlement of equity awards | 2,817,000,000 | $ 2,527,000,000 | $ 1,874,000,000 |
Total unrecognized compensation cost related to RSUs and stock options | $ 10,500,000,000 |  |  |
Total unrecognized compensation cost related to RSUs and stock options, weighted-average recognition period | 2 years 6 months |  |  |
Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Employer matching contribution to 401(k) Plan as a percentage of employee's contribution | 50.00% |  |  |
Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Employer matching contribution to 401(k) Plan as a percentage of employee's contribution | 100.00% |  |  |
Employer matching contribution to 401(k) Plan as a percentage of employee's eligible earnings | 6.00% |  |  |
Restricted stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Fair value of RSUs as of the respective vesting dates | $ 8,600,000,000 | $ 7,600,000,000 | $ 6,100,000,000 |
The total shares withheld upon vesting of RSUs (in shares) | shares | 14,800,000 | 16,000,000.0 | 15,400,000 |
Taxes paid related to net share settlement of equity awards | $ 3,000,000,000.0 | $ 2,700,000,000 | $ 2,000,000,000.0 |
Employee Stock Purchase Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Employee common stock purchases through payroll deductions, price as a percentage of fair market value | 85.00% |  |  |
Employee Stock Purchase Plan offering period | 6 months |  |  |
Payroll deductions as a percentage of employee compensation, maximum | 10.00% |  |  |
Employee Stock Purchase Plan, maximum annual purchase amount per employee | $ 25,000 |  |  |
Shares reserved for future issuance under stock plans (in shares) | shares | 31,100,000 |  |  |
2014 Employee Stock Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares authorized for future issuance under stock plans (in shares) | shares |  |  |  | 385,000,000
Shares reserved for future issuance under stock plans (in shares) | shares | 246,400,000 |  |  |
2014 Employee Stock Plan | Restricted stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based award, vesting period | 4 years |  |  |
Number of shares of common stock issued per RSU upon vesting | 1 |  |  |
Factor by which each RSU granted reduces, and each RSU canceled or share withheld for taxes increases, the number of shares available for grant | 2 |  |  |
Non-Employee Director Stock Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares reserved for future issuance under stock plans (in shares) | shares | 1,100,000 |  |  |
Non-Employee Director Stock Plan | Restricted stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Factor by which each RSU granted reduces, and each RSU canceled or share withheld for taxes increases, the number of shares available for grant | 2 |  |  |

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- Definition Factor (generally 2-for-1) by which shares available for future grant change as a result of RSU transactions. Each RSU granted reduces shares available for future grant, and each RSU canceled or withheld to satisfy tax withholding obligations increases shares available for future grant. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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