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Summary of Significant Accounting Policies - Additional Information (Detail) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 01, 2017 USD ($) | Mar. 19, 2015 | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Jun. 21, 2016
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of Countries in which Entity Operates (more than) |  |  | 200 |  |  |  |
Number of reportable segments |  |  | 1 |  |  |  |
Payments to Acquire Available-for-sale Securities |  |  | $ 3,238,000,000 | $ 10,426,000,000 |  | $ 2,850,000,000 |
Proceeds from maturities and sales |  |  | 5,012,000,000 | 9,119,000,000 |  | 1,925,000,000 |
Indefinite-lived intangible impairment | $ 0 |  |  |  |  |  |
Goodwill, impairment loss | $ 0 |  |  |  |  |  |
Income tax provision (Note 18) |  |  | 4,995,000,000 | 2,021,000,000 | [1] | 2,667,000,000 |
Income to net cash provided by operating activities |  |  | 9,208,000,000 | 5,574,000,000 |  | 6,584,000,000 |
Increase in net cash used in financing activities |  |  | (5,924,000,000) | 7,477,000,000 |  | $ (3,603,000,000) |
New Accounting Pronouncement, Early Adoption, Effect |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Income tax provision (Note 18) |  |  | 70,000,000 |  |  |  |
Income to net cash provided by operating activities |  |  | 70,000,000 |  |  |  |
Increase in net cash used in financing activities |  |  | $ 70,000,000 |  |  |  |
Domestic |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Expected average employee future service period for United States plans (in years) |  |  | 9 years |  |  |  |
Non-U.S. Plans |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Expected average employee future service period for United States plans (in years) |  |  | 11 years |  |  |  |
Minimum |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Acquired long-lived intangible assets useful life |  |  | 3 years |  |  |  |
Maximum |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Acquired long-lived intangible assets useful life |  |  | 15 years |  |  |  |
Furniture and Fixtures | Minimum |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated useful life |  |  | 2 years |  |  |  |
Furniture and Fixtures | Maximum |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated useful life |  |  | 10 years |  |  |  |
Building Improvements | Minimum |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated useful life |  |  | 3 years |  |  |  |
Building Improvements | Maximum |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated useful life |  |  | 40 years |  |  |  |
Building |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated useful life |  |  | 40 years |  |  |  |
Restatement Adjustment |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Payments to Acquire Available-for-sale Securities |  |  |  | (17,600,000,000) |  |  |
Proceeds from maturities and sales |  |  |  | 17,600,000,000 |  |  |
Scenario, Previously Reported |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Payments to Acquire Available-for-sale Securities |  |  |  | 28,000,000,000 |  |  |
Proceeds from maturities and sales |  |  |  | $ 26,700,000,000 |  |  |
Class A common stock |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Common stock split, conversion ratio |  | 4 |  |  |  |  |
Visa Europe |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Share capital of Visa Europe acquired (percent) |  |  |  |  |  |  | 100.00%
[1] | See Note 2—Visa Europe.

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