| **DESCRIPTION OF BUSINESS, BASIS OF PRESENTATION AND ACCOUNTING POLICIES (Policies)** | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
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| **Accounting Policies [Abstract]**                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| Basis of Presentation                                                                 | Basis of PresentationThese Condensed Consolidated Financial Statements include the accounts of the Company and its consolidated subsidiaries, including certain Trusts that are considered VIEs. The Company generally consolidates VIEs for which it is deemed to be the primary beneficiary and VOEs in which the Company has a controlling financial interest. All significant intercompany balances and transactions have been eliminated in consolidation. These Condensed Consolidated Financial Statements have been prepared in accordance with GAAP and pursuant to SEC regulations. In the opinion of management, the accompanying Condensed Consolidated Financial Statements reflect all adjustments of a normal and recurring nature necessary for a fair statement of the Consolidated Balance Sheets, Statements of Operations, Statements of Comprehensive Income, Statements of Stockholder's Equity and SCF for the periods indicated, and contain adequate disclosure to make the information presented not misleading.Certain prior-year amounts have been reclassified to conform to the current year presentation. These reclassifications did not have a material impact on the Company's consolidated financial condition or results of operations.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| Use of Estimates                                                                      | Use of EstimatesThe preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts in the financial statements and accompanying notes.  Actual results could differ from those estimates, and those differences may be material.  The most significant estimates include the ACL,  expected end-of-term lease residual values, and goodwill. These estimates, although based on actual historical trends and modeling, may potentially show significant variances over time.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Recently Adopted Accounting Standards                                                 | Recently Adopted Accounting StandardsOn July 1, 2022, the Company early adopted ASU 2022-01 Derivatives and Hedging (Topic 815) Fair Value hedging – Portfolio Layer Method to coincide with a new Company program for portfolio layer hedges.This ASU expands the last-of-layer method for fair value hedges of interest rate risk to allow multiple hedged layers of a closed portfolio. Under this updated guidance, entities can now hedge all financial assets under the portfolio layer method and designate multiple hedged layers within a single closed portfolio. There was no impact on the opening balance sheets from this adoption.In March 2022, the FASB issued ASU 2022-02Financial Instruments – Credit Losses (Topic 326) Troubled Debt Restructuring and Vintage Disclosures.This guidance removes the specific accounting and disclosure guidance for TDR designations and enhances disclosure requirements related to modifications of receivables made to borrowers experiencing financial difficulty. In addition, the standard requires disclosure of current-period gross write-offs by year of origination for financing receivables and net investment in leases.  The Company adopted the new guidance on January 1, 2023 on a modified retrospective basis with a cumulative effect adjustment to retained earnings. The effect of the implementation was an increase in the ACL of approximately $55.2 million, a decrease in retained earnings of approximately $41.4 million and a decrease in deferred tax liabilities of approximately $13.8 million. Refer to Note 3 for additional information on modified loans.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| Fair Value Measurements                                                               | The Company values assets and liabilities based on the principal market in which each would be sold (in the case of assets) or transferred (in the case of liabilities). The principal market is the forum with the greatest volume and level of activity. In the absence of a principal market, the valuation is based on the most advantageous market. In the absence of observable market transactions, the Company considers liquidity valuation adjustments to reflect the uncertainty in pricing the instruments. The fair value of a financial asset is measured on a stand-alone basis and cannot be measured as a group, with the exception of certain financial instruments held and managed on a net portfolio basis. In measuring the fair value of a nonfinancial asset, the Company assumes the highest and best use of the asset by a market participant, not just the intended use, to maximize the value of the asset. The Company also considers whether any credit valuation adjustments are necessary based on the counterparty's credit quality. Any models used to determine fair values or validate dealer quotes based on the descriptions below are subject to review and testing as part of the Company's model validation and internal control testing processes. The Company's Market Risk Department approves the methodologies used in the estimations of fair value, including the Company's Level 3 assets and liabilities. Price validation procedures are performed and the results are reviewed for Level 3 assets and liabilities by the Market Risk Department. Price validation procedures performed for these assets and liabilities can include comparing current prices to historical pricing trends by collateral type and vintage, comparing prices by product type to indicative pricing grids published by market makers, and obtaining corroborating dealer prices for significant securities.The Company reviews the assumptions utilized to determine fair value on a quarterly basis. Any changes in methodologies or significant inputs used in determining fair values are further reviewed to determine if a change in fair value level hierarchy has occurred. |

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Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).
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Disclosure of accounting policy for fair value measurements of financial and non-financial assets, liabilities and instruments classified in shareholders' equity. Disclosures include, but are not limited to, how an entity that manages a group of financial assets and liabilities on the basis of its net exposure measures the fair value of those assets and liabilities.
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Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact.
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Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.
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