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Information that Causes the Income Tax Expense to Differ from the Amount of Income Tax Determined by Applying the Applicable U.S. Federal Statutory Rate of 35% to Pretax Income (Detail) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Income Tax Disclosure [Abstract] |  |  |  |
U.S. federal income tax at statutory rate | $ 2,804 |  | $ 3,148 | $ 2,704
State income taxes, net of federal benefit | 135 |  | 194 | 129
Non-U.S. tax effect, net of federal benefit | (553) |  | (327) | (278)
Prior years U.S. domestic production activities deduction | 0 |  | 0 | (191)
Remeasurement of deferred tax liability | (88) |  | 0 | 0
Reversal of prior years tax reserves related to the resolution of uncertain tax positions | 0 |  | (239) | 0
Revaluation of Visa Europe put option | (89) |  | 0 | 0
Other, net | (188) |  | (109) | (78)
Income tax provision | $ 2,021 | [1] | $ 2,667 | $ 2,286
U.S. federal income tax at statutory rate, percent | 35.00% |  | 35.00% | 35.00%
State income taxes, net of federal benefit, percent | 2.00% |  | 2.00% | 2.00%
Non-U.S. tax effect, net of federal benefit, percent | (7.00%) |  | (4.00%) | (4.00%)
Prior years U.S. domestic production activities deduction, percent | 0.00% |  | 0.00% | (2.00%)
Remeasurement of deferred tax liability, percent | (1.00%) |  | 0.00% | 0.00%
Reversal of prior years tax reserves related to the resolution of uncertain tax positions, percent | 0.00% |  | (2.00%) | 0.00%
Revaluation of Visa Europe put option, percent | (1.00%) |  | 0.00% | 0.00%
Other, net, percent | (3.00%) |  | (1.00%) | (1.00%)
Income tax expense, percent | 25.00% |  | 30.00% | 30.00%
[1] | The Company did not include Visa Europe's financial results in the Company's consolidated statements of operations from the acquisition date, June 21, 2016, through June 30, 2016 as the impact was immaterial. The Company's consolidated statement of operations for the year ended September 30, 2016 includes Visa Europe's financial results for the three months ended September 30, 2016. See Note 2—Acquisition of Visa Europe.

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
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