Summary of Significant Accounting Policies (Policies)	9 Months Ended
Jun. 30, 2021
Accounting Policies [Abstract]
Consolidation and basis of presentation	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 unaudited consolidated financial statements as of and for the periods presented. All significant intercompany accounts and transactions are eliminated in consolidation. 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, 2020 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.
Use of estimates	Use of estimates. The preparation of the accompanying unaudited consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions about future events. These estimates and assumptions affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the unaudited consolidated financial statements and reported amounts of revenues and expenses during the reporting period. These estimates may change, as new events occur and additional information is obtained, and will be recognized in the unaudited consolidated financial statements in the period in which such changes occur. Future actual results could differ materially from these estimates. Coronavirus (“COVID-19”) has continued to create significant uncertainty in the global economy. There have been no comparable recent events that provide guidance as to the effect COVID-19 as a global pandemic may have, and, as a result, the ultimate impact of COVID-19 and the extent to which COVID-19 continues to impact the Company’s business, results of operations and financial condition will depend on future developments, which are highly uncertain and difficult to predict.
Recently adopted accounting pronouncements	Recently Adopted Accounting Pronouncements In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Board Update (“ASU”) 2016-13, which requires the measurement and recognition of expected credit losses for financial assets and certain other instruments held at amortized cost. The Company adopted the standard effective October 1, 2020 using the modified retrospective transition method with comparative periods continuing to be reported using the previous applicable guidance. The adoption did not have a material impact on the consolidated financial statements. In accordance with ASU 2016-13, the Company uses a forward-looking expected credit loss model for financial instruments measured at amortized cost. For available-for-sale debt securities, when credit loss indicators exist and a discounted cash flow approach results in a credit loss, the credit loss will be recorded through an allowance rather than through an other-than-temporary impairment. In addition to recording the fair value of its settlement indemnification liability, under the new standard, the Company estimates expected credit losses and recognizes an allowance for those credit losses related to its settlement indemnification obligations. In January 2017, the FASB issued ASU 2017-04, which simplifies the accounting for goodwill impairments by eliminating Step 2 from the goodwill impairment test. Under the amendments in ASU 2017-04, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of the reporting unit with its carrying amount, which is Step 1 of the goodwill impairment test. An impairment charge should be recognized for the amount by which the carrying amount exceeds the reporting unit’s fair value, not to exceed the total amount of goodwill allocated to that reporting unit. The Company adopted the standard effective October 1, 2020. The adoption had no impact on the consolidated financial statements. In August 2018, the FASB issued ASU 2018-13, which modifies the disclosure requirements for fair value measurements by removing, modifying or adding certain disclosures. The Company adopted this standard effective October 1, 2020. The adoption did not have a material impact on the consolidated financial statements.

Summary of Significant Accounting Policies (Policies)

9 Months Ended

Jun. 30, 2021

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 unaudited consolidated financial statements as of and for the periods presented. All significant intercompany accounts and transactions are eliminated in consolidation.

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, 2020 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.

Use of estimates

Use of estimates. The preparation of the accompanying unaudited consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions about future events. These estimates and assumptions affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the unaudited consolidated financial statements and reported amounts of revenues and expenses during the reporting period. These estimates may change, as new events occur and additional information is obtained, and will be recognized in the unaudited consolidated financial statements in the period in which such changes occur. Future actual results could differ materially from these estimates. Coronavirus (“COVID-19”) has continued to create significant uncertainty in the global economy. There have been no comparable recent events that provide guidance as to the effect COVID-19 as a global pandemic may have, and, as a result, the ultimate impact of COVID-19 and the extent to which COVID-19 continues to impact the Company’s business, results of operations and financial condition will depend on future developments, which are highly uncertain and difficult to predict.

Recently adopted accounting pronouncements

Recently Adopted Accounting Pronouncements

In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Board Update (“ASU”) 2016-13, which requires the measurement and recognition of expected credit losses for financial assets and certain other instruments held at amortized cost. The Company adopted the standard effective October 1, 2020 using the modified retrospective transition method with comparative periods continuing to be reported using the previous applicable guidance. The adoption did not have a material impact on the consolidated financial statements.

In accordance with ASU 2016-13, the Company uses a forward-looking expected credit loss model for financial instruments measured at amortized cost. For available-for-sale debt securities, when credit loss indicators exist and a discounted cash flow approach results in a credit loss, the credit loss will be recorded through an allowance rather

than through an other-than-temporary impairment. In addition to recording the fair value of its settlement indemnification liability, under the new standard, the Company estimates expected credit losses and recognizes an allowance for those credit losses related to its settlement indemnification obligations.

In January 2017, the FASB issued ASU 2017-04, which simplifies the accounting for goodwill impairments by eliminating Step 2 from the goodwill impairment test. Under the amendments in ASU 2017-04, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of the reporting unit with its carrying amount, which is Step 1 of the goodwill impairment test. An impairment charge should be recognized for the amount by which the carrying amount exceeds the reporting unit’s fair value, not to exceed the total amount of goodwill allocated to that reporting unit. The Company adopted the standard effective October 1, 2020. The adoption had no impact on the consolidated financial statements.

In August 2018, the FASB issued ASU 2018-13, which modifies the disclosure requirements for fair value measurements by removing, modifying or adding certain disclosures. The Company adopted this standard effective October 1, 2020. The adoption did not have a material impact on the consolidated financial statements.