Summary of Significant Accounting Policies	9 Months Ended
Jun. 30, 2016
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 1—Summary of Significant Accounting Policies Organization. Visa Inc. (“Visa” or the “Company”) is a global payments technology company that connects consumers, businesses, financial institutions and governments in more than 200 countries and territories to fast, secure and reliable electronic payments. Visa and its wholly-owned consolidated subsidiaries, including Visa U.S.A. Inc. (“Visa U.S.A.”), Visa International Service Association (“Visa International”), Visa Worldwide Pte. Limited, Visa Europe Limited ("Visa Europe"), Visa Canada Corporation, Inovant LLC and CyberSource Corporation (“CyberSource”), operate one of the world’s most advanced processing networks — VisaNet — which facilitates authorization, clearing and settlement of payment transactions worldwide. VisaNet also offers fraud protection for account holders and assured payment for merchants. Visa is not a bank and does not issue cards, extend credit or set rates and fees for account holders on Visa-branded cards and payment products. In most cases, account holder and merchant relationships belong to, and are managed by, Visa's financial institution clients. Visa provides a wide variety of payment solutions that support payment products that issuers can offer to their account holders: pay now with debit, pay ahead with prepaid or pay later with credit products. Visa also offers a growing suite of innovative digital, eCommerce and mobile products and services. These services facilitate transactions on Visa's network among account holders, merchants, financial institutions and governments in mature and emerging markets globally. Consolidation and basis of presentation. The accompanying unaudited consolidated financial statements include the accounts of Visa and its consolidated entities and are presented in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). The Company consolidates its majority-owned and controlled entities, including variable interest entities (“VIEs”) for which the Company is the primary beneficiary. The Company’s investments in VIEs have not been material to its consolidated financial statements as of and for the periods presented. All significant intercompany accounts and transactions are eliminated in consolidation. On June 21, 2016, the Company acquired 100% of the share capital of Visa Europe. The Company's unaudited consolidated balance sheets reflect preliminary balances of Visa Europe as of June 30, 2016, pending final valuation. The Company's unaudited consolidated statements of operations do not reflect the financial results of Visa Europe for the 10 days from the acquisition date through June 30, 2016 as the impact is immaterial. The functional currency of Visa Europe is the euro. Translation from the euro to the U.S. dollar is performed for balance sheet accounts using exchange rates in effect at the balance sheet date and for revenue and expense accounts using an average exchange rate for the period. Resulting translation adjustments are reported as a component of accumulated other comprehensive income or loss on the unaudited consolidated balance sheets. These translation adjustments are partially offset by changes in the euro-denominated deferred cash consideration liability of $1.2 billion, attributable to the change in exchange rates at the end of each reporting period, which has been designated as a hedge against the Company's euro-denominated net investment in Visa Europe. See Note 2—Visa Europe and Note 8—Derivative and Non-derivative Financial Instruments. Changes in the euro exchange rate against the U.S. dollar from the acquisition date of June 21, 2016 to the balance sheet date of June 30, 2016 resulted in net foreign currency translation adjustments of $404 million. The accompanying unaudited consolidated financial statements are presented in accordance with the U.S. Securities and Exchange Commission (“SEC”) requirements for Quarterly Reports on Form 10-Q and, consequently, do not include all of the annual disclosures required by U.S. GAAP. Reference should be made to the Visa Annual Report on Form 10-K for the year ended September 30, 2015 for additional disclosures, including a summary of the Company’s significant accounting policies. In the opinion of management, the accompanying unaudited consolidated financial statements include all normal recurring adjustments necessary for a fair presentation of the Company's financial position, results of operations and cash flows for the interim periods presented. Recently Issued and Adopted Accounting Pronouncements. In April 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2015-03, which simplifies the presentation of debt issuance costs by requiring that debt issuance costs be presented in the balance sheet as a direct deduction from the carrying amount of debt liability, consistent with debt discounts or premiums. The standard impacts presentation only. The Company elected to early adopt the standard effective October 1, 2015 and the carrying amount of the Company's debt liability is presented net of issuance costs on the unaudited consolidated financial statements. Also see Note 5—Debt. In September 2015, the FASB issued ASU No. 2015-16, which simplifies the accounting for post-acquisition adjustments by eliminating the requirement to retrospectively account for the adjustments made to provisional amounts recognized in a business combination. The Company elected to early adopt this guidance on a prospective basis effective October 1, 2015. The adoption did not have a material impact on the consolidated financial statements. In November 2015, the FASB issued ASU 2015-17, which simplifies the presentation of deferred income taxes by requiring that deferred tax assets and liabilities be presented as non-current. The standard impacts presentation only. The Company elected to early adopt the standard on a retrospective basis effective October 1, 2015 and all deferred tax assets and liabilities are classified as non-current. Previously, current deferred tax assets had been presented separately and current deferred tax liabilities had been included in accrued liabilities on the consolidated balance sheets. All prior period amounts within the consolidated financial statements have been reclassified to conform to current period presentation. The reclassification did not affect the Company's total equity, operating revenues, net income, comprehensive income or cash flows as of and for the periods presented. In January 2016, the FASB issued ASU 2016-01, which amends certain aspects of recognition, measurement, presentation and disclosure of financial instruments, including the requirement to measure certain equity investments at fair value with changes in fair value recognized in net income. The Company will adopt the standard effective October 1, 2018. The adoption is not expected to have a material impact on the consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, which requires the recognition of lease assets and lease liabilities arising from operating leases in the statement of financial position. The Company will adopt the standard effective October 1, 2019 and does not anticipate that this new accounting guidance will have a material impact on its consolidated statement of operations. The Company estimates the value of leased assets and liabilities that may be recognized could be in the hundreds of millions of dollars. The actual impact will depend on the Company's lease portfolio at the time of adoption. In March 2016, the FASB issued ASU 2016-05, which clarifies that a change in the counterparty to a derivative instrument that has been designated as the hedging instrument under Topic 815, Derivatives and Hedging, does not, in and of itself, require dedesignation of that hedging relationship provided that all other hedge accounting criteria continue to be met. The Company will adopt the standard effective October 1, 2017. The adoption is not expected to have a material impact on the consolidated financial statements. In March 2016, the FASB issued ASU 2016-06, which clarifies the requirements for assessing whether contingent call/put options that can accelerate the payment of principal on debt instruments are clearly and closely related to their debt hosts. An entity performing the assessment is required to assess the embedded call/put options solely in accordance with a four-step decision sequence. The Company will adopt the standard effective October 1, 2017. The adoption is not expected to have a material impact on the consolidated financial statements. In March 2016, the FASB issued ASU 2016-07, which eliminates the requirement that an entity retroactively adopt the equity method of accounting if an investment qualifies for use of the equity method as a result of an increase in the level of ownership or degree of influence. The equity method investor is required to add the cost of acquiring the additional interest in the investee to the current basis of the investor's previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. The Company will adopt the standard effective October 1, 2017. The adoption is not expected to have a material impact on the consolidated financial statements. In March 2016, the FASB issued ASU 2016-08, which clarifies the implementation guidance on principal versus agent considerations under the new revenue recognition standard, ASU 2014-09, Revenue from Contracts with Customers. In April 2016, the FASB issued ASU 2016-10, which clarifies the implementation guidance on identifying promised goods or services and on determining whether an entity's promise to grant a license with either a right to use the entity's intellectual property (which is satisfied at a point in time) or a right to access the entity's intellectual property (which is satisfied over time). In May 2016, the FASB issued ASU 2016-11, which rescinds certain SEC staff observer comments upon adoption of ASU 2014-09, including the SEC comments related to consideration given by a vendor to a customer. In May 2016, the FASB also issued ASU 2016-12, which provides narrow scope improvements and technical expedients on assessing collectibility, presentation of sales taxes, evaluating contract modifications and completed contracts at transition and the disclosure requirement for the effect of the accounting change for the period of adoption. The Company will adopt the standard effective October 1, 2018. The Company is still evaluating the full effect that ASU 2014-09 and all of its related subsequent updates will have on its consolidated financial statements and related disclosures. In March 2016, the FASB issued ASU 2016-09, which simplifies several aspects of the accounting for share-based payments, including immediate recognition of all excess tax benefits and deficiencies in the income statement, changing the threshold to qualify for equity classification up to the employees' maximum statutory tax rates, allowing an entity-wide accounting policy election to either estimate the number of awards that are expected to vest or account for forfeitures as they occur, and clarifying the classification on the statement of cash flows for the excess tax benefit and employee taxes paid when an employer withholds shares for tax-withholding purposes. The Company is evaluating the full effect that ASU 2016-09 will have on its consolidated financial statements and will early adopt the standard effective October 1, 2016. In May 2016, the FASB issued ASU 2016-13, which amends guidance on reporting credit losses for assets held at amortized cost basis and available-for-sale debt securities. The amendment requires a financial asset measured at amortized cost basis to be presented at the net amount expected to be collected. The amendment in this update also requires that credit losses on available-for-sale debt securities be presented as an allowance rather than as a write-down. The measurement of credit losses for newly recognized financial assets and subsequent changes in the allowance for credit losses are recorded in the statement of income. The Company is evaluating the full effect that ASU 2016-13 will have on its consolidated financial statements and will adopt the standard effective October 1, 2020.

Note 1—Summary of Significant Accounting Policies

Organization. Visa Inc. (“Visa” or the “Company”) is a global payments technology company that connects consumers, businesses, financial institutions and governments in more than 200 countries and territories to fast, secure and reliable electronic payments. Visa and its wholly-owned consolidated subsidiaries, including Visa U.S.A. Inc. (“Visa U.S.A.”), Visa International Service Association (“Visa International”), Visa Worldwide Pte. Limited, Visa Europe Limited ("Visa Europe"), Visa Canada Corporation, Inovant LLC and CyberSource Corporation (“CyberSource”), operate one of the world’s most advanced processing networks — VisaNet — which facilitates authorization, clearing and settlement of payment transactions worldwide. VisaNet also offers fraud protection for account holders and assured payment for merchants. Visa is not a bank and does not issue cards, extend credit or set rates and fees for account holders on Visa-branded cards and payment products. In most cases, account holder and merchant relationships belong to, and are managed by, Visa's financial institution clients. Visa provides a wide variety of payment solutions that support payment products that issuers can offer to their account holders: pay now with debit, pay ahead with prepaid or pay later with credit products. Visa also offers a growing suite of innovative digital, eCommerce and mobile products and services. These services facilitate transactions on Visa's network among account holders, merchants, financial institutions and governments in mature and emerging markets globally.

Consolidation and basis of presentation. The accompanying unaudited consolidated financial statements include the accounts of Visa and its consolidated entities and are presented in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). The Company consolidates its majority-owned and controlled entities, including variable interest entities (“VIEs”) for which the Company is the primary beneficiary. The Company’s investments in VIEs have not been material to its consolidated financial statements as of and for the periods presented. All significant intercompany accounts and transactions are eliminated in consolidation.

On June 21, 2016, the Company acquired 100% of the share capital of Visa Europe. The Company's unaudited consolidated balance sheets reflect preliminary balances of Visa Europe as of June 30, 2016, pending final valuation. The Company's unaudited consolidated statements of operations do not reflect the financial results of Visa Europe for the 10 days from the acquisition date through June 30, 2016 as the impact is immaterial. The functional currency of Visa Europe is the euro. Translation from the euro to the U.S. dollar is performed for balance sheet accounts using exchange rates in effect at the balance sheet date and for revenue and expense accounts using an average exchange rate for the period. Resulting translation adjustments are reported as a component of accumulated other comprehensive income or loss on the unaudited consolidated balance sheets. These translation adjustments are partially offset by changes in the euro-denominated deferred cash consideration liability of $1.2 billion, attributable to the change in exchange rates at the end of each reporting period, which has been designated as a hedge against the Company's euro-denominated net investment in Visa Europe. See Note 2—Visa Europe and Note 8—Derivative and Non-derivative Financial Instruments. Changes in the euro exchange rate against the U.S. dollar from the acquisition date of June 21, 2016 to the balance sheet date of June 30, 2016 resulted in net foreign currency translation adjustments of $404 million.

The accompanying unaudited consolidated financial statements are presented in accordance with the U.S. Securities and Exchange Commission (“SEC”) requirements for Quarterly Reports on Form 10-Q and, consequently, do not include all of the annual disclosures required by U.S. GAAP. Reference should be made to the Visa Annual Report on Form 10-K for the year ended September 30, 2015 for additional disclosures, including a summary of the Company’s significant accounting policies.

In the opinion of management, the accompanying unaudited consolidated financial statements include all normal recurring adjustments necessary for a fair presentation of the Company's financial position, results of operations and cash flows for the interim periods presented.

Recently Issued and Adopted Accounting Pronouncements.

In April 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2015-03, which simplifies the presentation of debt issuance costs by requiring that debt issuance costs be presented in the balance sheet as a direct deduction from the carrying amount of debt liability, consistent with debt discounts or premiums. The standard impacts presentation only. The Company elected to early adopt the standard effective October 1, 2015 and the carrying amount of the Company's debt liability is presented net of issuance costs on the unaudited consolidated financial statements. Also see Note 5—Debt.

In September 2015, the FASB issued ASU No. 2015-16, which simplifies the accounting for post-acquisition adjustments by eliminating the requirement to retrospectively account for the adjustments made to provisional amounts recognized in a business combination. The Company elected to early adopt this guidance on a prospective basis effective October 1, 2015. The adoption did not have a material impact on the consolidated financial statements.

In November 2015, the FASB issued ASU 2015-17, which simplifies the presentation of deferred income taxes by requiring that deferred tax assets and liabilities be presented as non-current. The standard impacts presentation only. The Company elected to early adopt the standard on a retrospective basis effective October 1, 2015 and all deferred tax assets and liabilities are classified as non-current. Previously, current deferred tax assets had been presented separately and current deferred tax liabilities had been included in accrued liabilities on the consolidated balance sheets. All prior period amounts within the consolidated financial statements have been reclassified to conform to current period presentation. The reclassification did not affect the Company's total equity, operating revenues, net income, comprehensive income or cash flows as of and for the periods presented.

In January 2016, the FASB issued ASU 2016-01, which amends certain aspects of recognition, measurement, presentation and disclosure of financial instruments, including the requirement to measure certain equity investments at fair value with changes in fair value recognized in net income. The Company will adopt the standard effective October 1, 2018. The adoption is not expected to have a material impact on the consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, which requires the recognition of lease assets and lease liabilities arising from operating leases in the statement of financial position. The Company will adopt the standard effective October 1, 2019 and does not anticipate that this new accounting guidance will have a material impact on its consolidated statement of operations. The Company estimates the value of leased assets and liabilities that may be recognized could be in the hundreds of millions of dollars. The actual impact will depend on the Company's lease portfolio at the time of adoption.

In March 2016, the FASB issued ASU 2016-05, which clarifies that a change in the counterparty to a derivative instrument that has been designated as the hedging instrument under Topic 815, Derivatives and Hedging, does not, in and of itself, require dedesignation of that hedging relationship provided that all other hedge accounting criteria continue to be met. The Company will adopt the standard effective October 1, 2017. The adoption is not expected to have a material impact on the consolidated financial statements.

In March 2016, the FASB issued ASU 2016-06, which clarifies the requirements for assessing whether contingent call/put options that can accelerate the payment of principal on debt instruments are clearly and closely related to their debt hosts. An entity performing the assessment is required to assess the embedded call/put options solely in accordance with a four-step decision sequence. The Company will adopt the standard effective October 1, 2017. The adoption is not expected to have a material impact on the consolidated financial statements.

In March 2016, the FASB issued ASU 2016-07, which eliminates the requirement that an entity retroactively adopt the equity method of accounting if an investment qualifies for use of the equity method as a result of an increase in the level of ownership or degree of influence. The equity method investor is required to add the cost of acquiring the additional interest in the investee to the current basis of the investor's previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. The Company will adopt the standard effective October 1, 2017. The adoption is not expected to have a material impact on the consolidated financial statements.

In March 2016, the FASB issued ASU 2016-08, which clarifies the implementation guidance on principal versus agent considerations under the new revenue recognition standard, ASU 2014-09, Revenue from Contracts with Customers. In April 2016, the FASB issued ASU 2016-10, which clarifies the implementation guidance on identifying promised goods or services and on determining whether an entity's promise to grant a license with either a right to use the entity's intellectual property (which is satisfied at a point in time) or a right to access the entity's intellectual property (which is satisfied over time). In May 2016, the FASB issued ASU 2016-11, which rescinds certain SEC staff observer comments upon adoption of ASU 2014-09, including the SEC comments related to consideration given by a vendor to a customer. In May 2016, the FASB also issued ASU 2016-12, which provides narrow scope improvements and technical expedients on assessing collectibility, presentation of sales taxes, evaluating contract modifications and completed contracts at transition and the disclosure requirement for the effect of the accounting change for the period of adoption. The Company will adopt the standard effective October 1, 2018. The Company is still evaluating the full effect that ASU 2014-09 and all of its related subsequent updates will have on its consolidated financial statements and related disclosures.

In March 2016, the FASB issued ASU 2016-09, which simplifies several aspects of the accounting for share-based payments, including immediate recognition of all excess tax benefits and deficiencies in the income statement, changing the threshold to qualify for equity classification up to the employees' maximum statutory tax rates, allowing an entity-wide accounting policy election to either estimate the number of awards that are expected to vest or account for forfeitures as they occur, and clarifying the classification on the statement of cash flows for the excess tax benefit and employee taxes paid when an employer withholds shares for tax-withholding purposes. The Company is evaluating the full effect that ASU 2016-09 will have on its consolidated financial statements and will early adopt the standard effective October 1, 2016.

In May 2016, the FASB issued ASU 2016-13, which amends guidance on reporting credit losses for assets held at amortized cost basis and available-for-sale debt securities. The amendment requires a financial asset measured at amortized cost basis to be presented at the net amount expected to be collected. The amendment in this update also requires that credit losses on available-for-sale debt securities be presented as an allowance rather than as a write-down. The measurement of credit losses for newly recognized financial assets and subsequent changes in the allowance for credit losses are recorded in the statement of income. The Company is evaluating the full effect that ASU 2016-13 will have on its consolidated financial statements and will adopt the standard effective October 1, 2020.