Summary of Significant Accounting Policies	12 Months Ended
Dec. 31, 2025
Rail
EBP, Accounting Policy [Line Items]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Accounting The financial statements of the Plan are prepared on the accrual basis of accounting in accordance with accounting principles generally accepted in the United States of America. Investments The Plan's interest in the Caterpillar Investment Trust ("Master Trust") and investments included in the participant directed brokerage accounts are valued as described in Note 4. Interest on investments is recorded daily as earned. Dividends are recorded on the ex-dividend date. The Master Trust presents, in Note 4, in Net investment income (loss), the net appreciation (depreciation) in the fair value of its investments which consists of the realized gains (losses) and the unrealized appreciation (depreciation) on those investments. Purchases and sales of securities are recorded on a trade-date basis. Administrative Expenses The Plan charges a $2.50 per month per participant fee to pay expenses as they come due. Expenses are recordkeeping fees, trustee fees, plan education and audit fees and are paid once they have been approved by the Caterpillar Inc. Benefit Funds Committee. If a participant has an account in more than one plan sponsored by Progress Rail, Caterpillar Inc. or an affiliate, they will only be charged one $2.50 per month fee. Caterpillar Inc. pays any administrative expenses which exceed amounts collected from participants annually by the Plan, excluding applicable expenses paid directly from participant accounts described below. If amounts collected from participants exceed certain administrative expenses, the Plan administrator determines whether a corrective action is appropriate which could include a reallocation of funds back to participant accounts or a structural change to the participant fees. In addition, certain administrative expenses are paid directly from participant accounts. These administrative expenses include monthly fees for participants that utilize professional management services and processing fees for qualified domestic relations orders and participant loans. Participant Withdrawals Participant withdrawals are recorded when paid. Transfers As discussed in Note 1, the Plan merged with and into 401(k) SIP on December 31, 2025 and as a result $17.5 million of net assets available for benefits were transferred into the 401(k) SIP. Use of Estimates in the Preparation of Financial Statements The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and changes therein, and disclosure of contingent assets and liabilities. Actual results could differ from those estimated. Risks and Uncertainties The Plan invested until December 31, 2025 in various investment securities. Investment securities are exposed to various risks, such as interest rate, market and credit risks. Due to the level of risk associated with certain investment securities, it is at least reasonably possible that changes in the values of investment securities could occur in the near term and that such changes could materially affect participant account balances and the amounts reported in the Statements of Net Assets Available for Benefits.

The Plan's interest in the Caterpillar Investment Trust ("Master Trust") and investments included in the participant directed brokerage accounts are valued as described in Note 4. Interest on investments is recorded daily as earned. Dividends are recorded on the ex-dividend date. The Master Trust presents, in Note 4, in Net investment income (loss), the net appreciation (depreciation) in the fair value of its investments which consists of the realized gains (losses) and the unrealized appreciation (depreciation) on those investments. Purchases and sales of securities are recorded on a trade-date basis.

The Plan charges a $2.50 per month per participant fee to pay expenses as they come due. Expenses are recordkeeping fees, trustee fees, plan education and audit fees and are paid once they have been approved by the Caterpillar Inc. Benefit Funds Committee. If a participant has an account in more than one plan sponsored by Progress Rail, Caterpillar Inc. or an affiliate, they will only be charged one $2.50 per month fee. Caterpillar Inc. pays any administrative expenses which exceed amounts collected from participants annually by the Plan, excluding applicable expenses paid directly from participant accounts described below. If amounts collected from participants exceed certain administrative expenses, the Plan administrator determines whether a corrective action is appropriate which could include a reallocation of funds back to participant accounts or a structural change to the participant fees.

In addition, certain administrative expenses are paid directly from participant accounts. These administrative expenses include monthly fees for participants that utilize professional management services and processing fees for qualified domestic relations orders and participant loans.

As discussed in Note 1, the Plan merged with and into 401(k) SIP on December 31, 2025 and as a result $17.5 million of net assets available for benefits were transferred into the 401(k) SIP.

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and changes therein, and disclosure of contingent assets and liabilities. Actual results could differ from those estimated.

The Plan invested until December 31, 2025 in various investment securities. Investment securities are exposed to various risks, such as interest rate, market and credit risks. Due to the level of risk associated with certain investment securities, it is at least reasonably possible that changes in the values of investment securities could occur in the near term and that such changes could materially affect participant account balances and the amounts reported in the Statements of Net Assets Available for Benefits.