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Income Taxes - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended | 19 Months Ended
--- | --- | --- | ---
Jul. 27, 2019 | Jul. 28, 2018 | Jan. 27, 2018 | Jul. 27, 2019 | Jul. 28, 2018 | Jul. 29, 2017 | Jul. 27, 2019
Income Tax [Line Items] |  |  |  |  |  |  |
Tax Cuts and Jobs Act of 2017, provisional tax expense |  |  | $ 11,100 |  | $ 10,400 |  |
Tax Cuts and Jobs Act, transition tax for accumulated foreign earnings, income tax benefit |  | $ (863) | $ 9,000 |  | 863 |  |
Tax Cuts and Jobs Act, reversal of previously reported benefit | $ 872 |  |  |  |  |  |
Tax Cuts and Jobs Act, transition tax expense (benefit) |  |  |  |  |  |  | $ 11,300
Tax Cuts and Jobs Act, tax expense for transition tax on accumulated foreign earnings |  |  |  |  |  |  | 9,000
Tax Cuts and Jobs Act, tax expense for foreign withholding tax |  |  |  |  |  |  | 1,200
Tax Cuts and Jobs Act, re-measurement of net deferred tax assets |  |  |  |  |  |  | 1,100
Undistributed earnings of certain foreign subsidiaries on which tax is not provided | 6,600 |  |  | $ 6,600 |  |  | 6,600
Unrecognized deferred income tax liability | 711 |  |  | 711 |  |  | 711
Gross income tax benefit attributable to tax incentives |  |  |  | $ 300 | $ 900 | $ 1,300 |
Gross income tax benefit attributable to tax incentives (in dollars per share) |  |  |  | $ 0.08 | $ 0.19 | $ 0.25 |
Unrecognized tax benefits that would affect the effective tax rate if realized | 1,700 |  |  | $ 1,700 |  |  | 1,700
Net interest expense, reduction related to unrecognized tax benefits |  |  |  | 30 | $ 10 |  |
Penalties, reduction related to unrecognized tax benefits |  |  |  | 6 |  |  |
Reduction in net interest expense |  |  |  |  |  | $ 26 |
Reduction in penalties |  |  |  |  |  | 4 |
Accrual for interest and penalties | 220 | $ 180 |  | 220 | $ 180 | $ 186 | 220
Unrecognized tax benefit that could be reduced in next 12 months | 50 |  |  | 50 |  |  | 50
Foreign Tax Authority |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |
Operating loss carryforwards | 756 |  |  | 756 |  |  | 756
Valuation allowance | 111 |  |  | 111 |  |  | 111
Tax credit carryforward | 5 |  |  | 5 |  |  | 5
Federal |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |
Operating loss carryforwards | 676 |  |  | 676 |  |  | 676
Tax credit carryforward | 25 |  |  | 25 |  |  | 25
State and Local Jurisdiction |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |
Operating loss carryforwards | 1,000 |  |  | 1,000 |  |  | 1,000
Tax credit carryforward | 1,100 |  |  | 1,100 |  |  | 1,100
Valuation allowance | $ 346 |  |  | $ 346 |  |  | $ 346

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- Definition Tax Cuts And Jobs Act, Withholding Tax For Undistributed Foreign Earnings, Income Tax Expense + References No definition available. + Details
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- Definition Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Income Tax Expense, Reversal of Benefit + References No definition available. + Details
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