Interim Financial Data (Policies)	3 Months Ended
Jun. 30, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The information furnished in these unaudited interim consolidated financial statements as of and for the three months ended June 30, 2019 and 2018 has been prepared in accordance with generally accepted accounting principles in the United States (“U.S. GAAP”). In the opinion of management, the unaudited consolidated financial information reflects all adjustments, consisting of normal recurring adjustments, necessary for a fair statement of the results for the interim periods presented. The results of operations for the three months ended June 30, 2019 do not necessarily indicate the results which may be expected for the full fiscal year ending March 31, 2020 (“fiscal 2020”). These financial statements should be read in conjunction with the Consolidated Financial Statements, significant accounting policies, and other Notes to Consolidated Financial Statements included in Toyota Motor Credit Corporation’s Annual Report on Form 10-K (“Form 10-K”) for the fiscal year ended March 31, 2019 (“fiscal 2019”), which was filed with the Securities and Exchange Commission on June 4, 2019. References herein to “TMCC” denote Toyota Motor Credit Corporation, and references herein to “we”, “our”, and “us” denote Toyota Motor Credit Corporation and its consolidated subsidiaries. Certain prior period amounts have been reclassified to conform to current period presentation. Related party transactions are disclosed in Note 11 – Related Party Transactions. As previously disclosed, on April 16, 2019, we announced that we will restructure our field operations over the next two years to better serve our dealer partners by streamlining our field office structure into three regional locations and investing in new technology. Costs associated with this restructure are not expected to be significant.
Recently Adopted Accounting Guidance	Recently Adopted Accounting Guidance On April 1, 2019, we adopted the following new accounting standards: Leases We adopted Accounting Standards Update (“ASU”) 2016-02, Leases (Topic 842) (“ASU 2016-02”), along with the subsequently issued guidance amending and clarifying various aspects of the new lease guidance, using the modified retrospective method. In accordance with that method, the comparative period’s information has not been restated and continues to be reported under the lease accounting guidance in effect for that period. We also elected to apply the package of practical expedients permitted under the transition guidance of the new standard which allowed us to not reassess our historical lease classification, initial direct costs, and whether or not contracts entered into prior to adoption are or contain leases. As a lessor, the adoption of ASU 2016-02, did not have a significant impact on our financial statements. As a lessee, the adoption of ASU 2016-02 added right-of-use (“ROU”) assets of $115 million and operating lease liabilities of $122 million, which are included in Other assets, and in Other liabilities, respectively, in our Consolidated Balance Sheet. The adoption of this new guidance did not impact our Consolidated Statement of Income and did not result in a cumulative-effect adjustment to opening retained earnings. Refer to Note 4 – Investments in Operating Leases, Net and Note 9 – Commitments and Contingencies for additional information.
Other Recently Adopted Standards	Other Recently Adopted Standards We adopted ASU 2017-08, Receivables – Nonrefundable Fees and Other Costs, which requires certain premiums on callable debt securities to be amortized to the earliest call date. The adoption of this guidance did not have a material impact on our consolidated financial statements and related disclosures. We adopted ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. The adoption of this guidance did not have an impact on our consolidated financial statements and related disclosures as we no longer have hedge accounting derivatives.
Accounting Guidance Issued But Not Yet Adopted	Accounting Guidance Issued But Not Yet Adopted In June 2016, the Financial Accounting Standards Board (“FASB”) issued ASU 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. This guidance introduces a new impairment model based on expected losses rather than incurred losses for certain types of financial instruments. It also modifies the impairment model for available-for-sale debt securities and provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. The FASB subsequently issued guidance amending and clarifying aspects of the new impairment model. This ASU is effective for us on April 1, 2020. We are in the process of developing, refining and testing the models and procedures that will be used to calculate the credit loss reserves in accordance with this new accounting guidance. We expect this new guidance will result in an increase in our allowance for credit losses with a cumulative-effect adjustment to our opening retained earnings in the period of adoption. The magnitude of the increase in our allowance for credit losses is under evaluation. We are currently evaluating the other potential impacts of this guidance on our consolidated financial statements and related disclosures. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820), which modifies disclosure requirements related to fair value measurement. This ASU is effective for us on April 1, 2020. We are currently evaluating the potential impacts of this guidance on our disclosures. In August 2018, the FASB issued ASU 2018-15, Intangibles—Goodwill and Other—Internal-Use Software, which aligns the accounting for costs incurred to implement a cloud computing arrangement that is a service arrangement with the guidance on capitalizing costs associated with developing or obtaining internal-use software. This ASU is effective for us on April 1, 2020. We are currently evaluating the potential impacts of this guidance on our consolidated financial statements and related disclosures. In October 2018, the FASB issued ASU 2018-17, Consolidation (Topic 810), which requires indirect interests held through related parties in common control arrangements to be considered on a proportional basis for determining whether fees paid to decision makers and service providers are variable interests. This ASU is effective for us on April 1, 2021. We are currently evaluating the potential impacts of this guidance on our consolidated financial statements and related disclosures. In April 2019, the FASB issued ASU 2019-04, Codification Improvements to Topic 326, Financial Instruments—Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments. The applicable provisions of this ASU are effective for us on April 1, 2020. We are currently evaluating the potential impacts of this guidance on our consolidated financial statements and related disclosures.

Interim Financial Data (Policies)

3 Months Ended

Jun. 30, 2019

The information furnished in these unaudited interim consolidated financial statements as of and for the three months ended June 30, 2019 and 2018 has been prepared in accordance with generally accepted accounting principles in the United States (“U.S. GAAP”). In the opinion of management, the unaudited consolidated financial information reflects all adjustments, consisting of normal recurring adjustments, necessary for a fair statement of the results for the interim periods presented. The results of operations for the three months ended June 30, 2019 do not necessarily indicate the results which may be expected for the full fiscal year ending March 31, 2020 (“fiscal 2020”).

These financial statements should be read in conjunction with the Consolidated Financial Statements, significant accounting policies, and other Notes to Consolidated Financial Statements included in Toyota Motor Credit Corporation’s Annual Report on Form 10-K (“Form 10-K”) for the fiscal year ended March 31, 2019 (“fiscal 2019”), which was filed with the Securities and Exchange Commission on June 4, 2019. References herein to “TMCC” denote Toyota Motor Credit Corporation, and references herein to “we”, “our”, and “us” denote Toyota Motor Credit Corporation and its consolidated subsidiaries.

Certain prior period amounts have been reclassified to conform to current period presentation. Related party transactions are disclosed in Note 11 – Related Party Transactions.

As previously disclosed, on April 16, 2019, we announced that we will restructure our field operations over the next two years to better serve our dealer partners by streamlining our field office structure into three regional locations and investing in new technology. Costs associated with this restructure are not expected to be significant.

Recently Adopted Accounting Guidance

On April 1, 2019, we adopted the following new accounting standards:

Leases

We adopted Accounting Standards Update (“ASU”) 2016-02, Leases (Topic 842) (“ASU 2016-02”), along with the subsequently issued guidance amending and clarifying various aspects of the new lease guidance, using the modified retrospective method. In accordance with that method, the comparative period’s information has not been restated and continues to be reported under the lease accounting guidance in effect for that period. We also elected to apply the package of practical expedients permitted under the transition guidance of the new standard which allowed us to not reassess our historical lease classification, initial direct costs, and whether or not contracts entered into prior to adoption are or contain leases. As a lessor, the adoption of ASU 2016-02, did not have a significant impact on our financial statements. As a lessee, the adoption of ASU 2016-02 added right-of-use (“ROU”) assets of $115 million and operating lease liabilities of $122 million, which are included in Other assets, and in Other liabilities, respectively, in our Consolidated Balance Sheet. The adoption of this new guidance did not impact our Consolidated Statement of Income and did not result in a cumulative-effect adjustment to opening retained earnings.

Refer to Note 4 – Investments in Operating Leases, Net and Note 9 – Commitments and Contingencies for additional information.

Other Recently Adopted Standards

We adopted ASU 2017-08, Receivables – Nonrefundable Fees and Other Costs, which requires certain premiums on callable debt securities to be amortized to the earliest call date. The adoption of this guidance did not have a material impact on our consolidated financial statements and related disclosures.

We adopted ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. The adoption of this guidance did not have an impact on our consolidated financial statements and related disclosures as we no longer have hedge accounting derivatives.

Accounting Guidance Issued But Not Yet Adopted

In June 2016, the Financial Accounting Standards Board (“FASB”) issued ASU 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. This guidance introduces a new impairment model based on expected losses rather than incurred losses for certain types of financial instruments. It also modifies the impairment model for available-for-sale debt securities and provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. The FASB subsequently issued guidance amending and clarifying aspects of the new impairment model. This ASU is effective for us on April 1, 2020. We are in the process of developing, refining and testing the models and procedures that will be used to calculate the credit loss reserves in accordance with this new accounting guidance. We expect this new guidance will result in an increase in our allowance for credit losses with a cumulative-effect adjustment to our opening retained earnings in the period of adoption. The magnitude of the increase in our allowance for credit losses is under evaluation. We are currently evaluating the other potential impacts of this guidance on our consolidated financial statements and related disclosures.

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820), which modifies disclosure requirements related to fair value measurement. This ASU is effective for us on April 1, 2020. We are currently evaluating the potential impacts of this guidance on our disclosures.

In August 2018, the FASB issued ASU 2018-15, Intangibles—Goodwill and Other—Internal-Use Software, which aligns the accounting for costs incurred to implement a cloud computing arrangement that is a service arrangement with the guidance on capitalizing costs associated with developing or obtaining internal-use software. This ASU is effective for us on April 1, 2020. We are currently evaluating the potential impacts of this guidance on our consolidated financial statements and related disclosures.

In October 2018, the FASB issued ASU 2018-17, Consolidation (Topic 810), which requires indirect interests held through related parties in common control arrangements to be considered on a proportional basis for determining whether fees paid to decision makers and service providers are variable interests. This ASU is effective for us on April 1, 2021. We are currently evaluating the potential impacts of this guidance on our consolidated financial statements and related disclosures.

In April 2019, the FASB issued ASU 2019-04, Codification Improvements to Topic 326, Financial Instruments—Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments. The applicable provisions of this ASU are effective for us on April 1, 2020. We are currently evaluating the potential impacts of this guidance on our consolidated financial statements and related disclosures.