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Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Tax Credit Carryforward [Line Items] |  |  |  |
US income before taxes | $ 8,440 | $ 5,839 |  | $ 7,214
Income tax provision | 4,995 | 2,021 | [1] | $ 2,667
Deferred tax assets, net | $ 1,307 | $ 2,712 |  |
U.S. federal statutory rate | 35.00% | 35.00% |  | 35.00%
Income tax provision, percent | 43.00% | 25.00% |  | 30.00%
Income tax expense benefit charitable contributions | $ 71 |  |  |
Visa Europe Framework Agreement loss | 0 | $ 1,877 | [1] | $ 0
Revaluation of Visa Europe put option |  | 255 |  |
Unrecognized tax benefits, period increase (decrease) |  |  |  | 296
Reversal of prior years tax reserves related to the resolution of uncertain tax positions | 0 | 0 |  | 239
Income taxes receivable included in prepaid and other current assets | 148 | 232 |  |
Income taxes payable included in accrued taxes as part of accrued liabilities | 243 | 153 |  |
Accrued income taxes included in other long-term liabilities | 1,092 | 911 |  |
Cumulative undistributed earnings of the Company's international subsidiaries intended to be reinvested indefinitely outside the U.S | 12,900 |  |  |
Decreased Singapore tax as a result of the tax incentive agreement | $ (252) | $ (235) |  | $ (192)
Benefit of the tax incentive agreement on diluted net income per share | $ 0.11 | $ 0.10 |  | $ 0.08
Total unrecognized tax benefits exclusive of interest and penalties | $ 1,353 | $ 1,160 |  | $ 1,051
Unrecognized tax benefits, if recognized, would reduce the effective tax rate in a future period | 1,100 | 926 |  |
Interest expense included in interest expense and administrative and other | 23 | 15 |  | 6
Accrued penalties related to uncertain tax positions | 1 | 3 |  | 1
Accrued interest related to uncertain tax positions in other long term liabilities | 84 | 61 |  |
Accrued penalties related to uncertain tax positions in other long term liabilities | 34 | 17 |  |
New Accounting Pronouncement, Early Adoption, Effect |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Income tax provision | 70 |  |  |
Federal |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Net operating loss carryforwards | 42 |  |  |
Federal foreign tax credit carryforward | 30 |  |  |
State and Local Jurisdiction |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Net operating loss carryforwards | 27 |  |  |
Foreign Country |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Net operating loss carryforwards | 140 |  |  |
Other Assets |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Deferred tax assets, net | 81 | 22 |  |
Non-current income tax receivable | 755 | 731 |  |
Visa Europe | Foreign Country |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Tax benefit due to remeasurement of deferred tax liabilities |  | (88) |  |
Non United States Customers |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
US income before taxes | 2,900 | $ 2,500 |  | $ 2,400
Visa Europe |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Income tax provision | $ 1,500 |  |  |
[1] | See Note 2—Visa Europe.

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