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Visa Europe - Additional Information (Detail) $ / shares in Units, € in Billions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 21, 2016 EUR (€) shares | Jun. 21, 2016 USD ($) shares | Sep. 30, 2016 USD ($) $ / shares | Sep. 30, 2016 USD ($) $ / shares | Sep. 30, 2016 USD ($) $ / shares | Sep. 30, 2015 USD ($) $ / shares | Sep. 30, 2014 USD ($) | Jun. 21, 2016 USD ($) $ / shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Convertible participating preferred stock issued in Visa Europe acquisition |  |  |  |  |  | $ 5,717,000,000 |  | $ 0 | $ 0 |
Average price of common stock (USD per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 77.33
Initial conversion rate of UK&I and Europe preferred stock into class A common or class A equivalent preferred stock | 13.952 |  |  |  |  |  |  |  |  | 13.952
Revenues |  |  |  |  |  | 15,082,000,000 | [1] | 13,880,000,000 | 12,702,000,000 |
Visa Europe Framework Agreement loss |  | $ (1,900,000,000) |  |  |  | (1,877,000,000) |  | 0 | 0 |
Debt Instrument, Face Amount |  |  |  | $ 16,000,000,000 | $ 16,000,000,000 | 16,000,000,000 |  |  |  |
Increase (Decrease) Liabilities Related to Investment Contracts, Fair Value Disclosure |  |  |  |  |  | 255,000,000 |  | $ 110,000,000 |  |
Foreign exchange gains related to euros |  |  |  |  |  | 145,000,000 |  |  |  |
Gains related to currency forward contracts |  |  |  |  |  | 74,000,000 |  |  |  |
Visa Europe |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Share capital of Visa Europe acquired (percent) | 100.00% |  |  |  |  |  |  |  |  | 100.00%
Up-front cash consideration | € 12.2 | 13,882,000,000 |  |  |  |  |  |  |  |
Convertible participating preferred stock issued in Visa Europe acquisition | 5.3 | 6,100,000,000 |  |  |  |  |  |  |  |
Contingent consideration | € | 1.0 |  |  |  |  |  |  |  |  |
Accrued interest on contingent consideration | € | € 0.0 |  |  |  |  |  |  |  |  |
Initial conversion rate of UK&I and Europe preferred stock into class A common or class A equivalent preferred stock | 13.952 |  |  |  |  |  |  |  |  | 13.952
Revenues |  |  |  |  | $ 554,000,000 |  |  |  |  |
Acquisition related costs |  |  |  |  |  | 96,000,000 |  |  |  |
Revenue since acquisition |  |  |  | $ 489,000,000 |  |  |  |  |  |
Visa Europe net income included in consolidated net income |  |  |  |  |  | 299,000,000 |  |  |  |
Impact of acquisition on consolidated net income |  |  |  |  |  | (872,000,000) |  |  |  |
Visa Europe Framework Agreement loss |  | $ (1,856,000,000) | [2] |  |  | $ (1,184,000,000) |  |  |  |
Visa Europe | Class A equivalent preferred stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, par value | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.0001
Conversion rate of U.K.&I preferred stock |  |  |  |  |  | 100 |  |  |  |
Visa Europe | U.K.&I preferred stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued at closing (shares) | shares | 2,480,466 | 2,480,466 |  |  |  |  |  |  |  |
Preferred stock, par value | $ / shares |  |  |  |  |  |  |  |  |  | 0.0001
Visa Europe | Europe preferred stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued at closing (shares) | shares | 3,156,823 | 3,156,823 |  |  |  |  |  |  |  |
Preferred stock, par value | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.0001
Loss Sharing Agreement | Visa Europe |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion rate of U.K.&I preferred stock | 0 | 0 |  |  |  |  |  |  |  |
Loss sharing agreement |  |  |  |  |  |  |  |  |  | $ 1,000,000,000
Preferred Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, par value | $ / shares |  |  |  | $ 0.0001 | $ 0.0001 | $ 0.0001 |  | $ 0.0001 |  |
Preferred Stock | Visa Europe |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued at closing (shares) | shares | 79,000,000 | 79,000,000 |  |  |  |  |  |  |  |
Operating Expense |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  | $ 152,000,000 |  |  |  |
Professional Fees |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  | 60,000,000 |  |  |  |
General and Administrative Expenses |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  | 92,000,000 |  |  |  |
Visa Europe | Framework Agreement |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  | $ 65,000,000 | 191,000,000 |  | $ 255,000,000 | $ 226,000,000 |
United Kingdom | Visa Europe |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Tax benefit upon remeasurement of deferred tax liability to reflect tax rate change |  |  |  |  | $ (88,000,000) | $ (88,000,000) |  |  |  |
[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.
[2] | the loss upon consummation of the transaction resulting from the effective settlement of the Framework Agreement between Visa and Visa Europe. The Visa Europe Framework Agreement provided Visa Europe with a perpetual, exclusive right to operate the Visa business in the Visa Europe region in exchange for a license fee paid to Visa. Under the terms of the Framework Agreement, the license fee paid by Visa Europe has increased modestly since inception in 2007, while the value of the Visa Europe business has increased at a greater rate. Using an income approach, the Company assessed the contractual terms and conditions of the Framework Agreement as compared to current market conditions and the historical and expected financial performance of Visa Europe. Based on the analysis performed, the Company determined that the terms were not at fair value as determined under U.S. GAAP at the Closing. The present value of the expected differential between payments required by the Framework Agreement and those that would be required if the contract were at fair value under U.S. GAAP was calculated over the Framework Agreement's contractual perpetual term, resulting in a loss of $1.9 billion recognized within operating expense in the Company's consolidated statement of operations during the third quarter of fiscal 2016, and a reduction to the purchase accounting consideration; and

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