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Income Taxes - Additional Information (Details) $ in Millions, € in Billions |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Aug. 30, 2016 EUR (€) Subsidiary | Mar. 31, 2018 USD ($) | Dec. 30, 2017 USD ($) | Apr. 01, 2017 USD ($) | Mar. 31, 2018 USD ($) | Apr. 01, 2017 USD ($) | Sep. 30, 2017 USD ($)
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
U.S. statutory federal income tax rate | 21.00% | 35.00% |  |  |  |  |  |  |
Income tax expense |  |  |  | $ 2,346 |  | $ 3,655 | $ 9,311 | $ 9,944 |
Provision for income taxes related to the Act, provisional amount |  |  |  |  | $ 2,600 |  |  |  |
Provision for income taxes related to remeasurement of deferred tax balances, provisional amount |  |  |  |  | 1,800 |  |  |  |
Provision for income taxes related to deemed repatriation tax, provisional amount |  |  |  |  | 800 |  |  |  |
Deferred tax liability for unremitted foreign earnings |  |  |  |  |  |  |  |  | $ 36,400
Deferred tax liability reversal |  |  |  |  |  |  | 34,235 | $ (2,822) |
Deemed repatriation tax payable, provisional amount |  |  |  |  | 38,000 |  |  |  |
Gross unrecognized tax benefits |  |  |  | 9,500 |  |  | 9,500 |  |
Unrecognized tax benefits that would affect effective tax rate, if recognized |  |  |  | 8,200 |  |  | 8,200 |  |
Unrecognized tax benefits, gross interest and penalties accrued |  |  |  | 1,500 |  |  | 1,500 |  |
Reasonably possible decrease in gross unrecognized tax benefits over next 12 months |  |  |  | 3,400 |  |  | 3,400 |  |
Unfavorable investigation outcome, EU State Aid rules |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Number of subsidiaries impacted by European Commission tax ruling | Subsidiary |  |  | 2 |  |  |  |  |  |
Maximum potential loss related to European Commission tax ruling | € |  |  | € 13 |  |  |  |  |  |
Unfavorable investigation outcome, EU State Aid rules - interest component |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Maximum potential loss related to European Commission tax ruling | € |  |  | € 1 |  |  |  |  |  |
Accumulated Other Comprehensive Income/(Loss) |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Reclassification from AOCI to retained earnings, tax effects of the Act |  |  |  |  |  |  | $ (278) |  |
Accounting Standards Update 2018-02 | Accumulated Other Comprehensive Income/(Loss) |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Reclassification from AOCI to retained earnings, tax effects of the Act |  |  |  | (278) |  |  |  |  |
Accounting Standards Update 2018-02 | Retained Earnings |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Reclassification from AOCI to retained earnings, tax effects of the Act |  |  |  | $ 278 |  |  |  |  |
Tax Cuts and Jobs Act, deemed repatriation tax, related amount |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax liability reversal |  |  |  |  | 36,100 |  |  |  |
Reduction of unrecognized tax benefits |  |  |  |  | $ 1,100 |  |  |  |

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