Background and Basis of Presentation	12 Months Ended
Background and Basis of Presentation	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Background and Basis of Presentation	Background and Basis of Presentation Description of Business: Alexander & Baldwin, Inc. ("A&B" or the "Company") is a fully integrated real estate investment trust ("REIT") headquartered in Honolulu, Hawai‘i, whose history in Hawai‘i dates back to 1870. Over time, the Company has evolved from a 571-acre sugar plantation on Maui to become one of Hawai‘i's premier commercial real estate companies and the owner of the largest grocery-anchored, neighborhood shopping center portfolio in the state. As of December 31, 2023, the Company owns a portfolio of commercial real estate improved properties in Hawai‘i consisting of 22 retail centers, 13 industrial assets and four office properties, representing a total of 3.9 million square feet of gross leasable area, as well as 142.0 acres of commercial land in Hawai‘i, of which substantially all is leased pursuant to urban ground leases. The Company operates in two segments: Commercial Real Estate and Land Operations. A description of each of the Company's reportable segments is as follows: •Commercial Real Estate ("CRE") - This segment functions as a vertically integrated real estate investment company with core competencies in investments and acquisitions (i.e., identifying opportunities and acquiring properties); construction and development (i.e., designing and ground-up development of new properties or repositioning and redevelopment of existing properties); and in-house leasing and property management (i.e., executing new and renegotiating renewal lease arrangements, managing its properties' day-to-day operations and maintaining positive tenant relationships). The Company's preferred asset classes include improved properties in retail and industrial spaces and also urban ground leases. Its focus within improved retail properties, in particular, is on grocery-anchored neighborhood shopping centers that meet the daily needs of Hawai‘i communities. Through its core competencies and with its experience and relationships in Hawai‘i, the Company seeks to create special places that enhance the lives of Hawai‘i residents and to provide venues and opportunities that enable its tenants to thrive. Income from this segment is principally generated by owning, operating, and leasing real estate assets. •Land Operations - This segment includes the Company's legacy landholdings, assets, and liabilities that are subject to the Company's simplification and monetization effort. Financial results from this segment are principally derived from real estate development and land sales, joint ventures, and other legacy business activities. Basis of Presentation and Principles of Consolidation: The accompanying Consolidated Financial Statements are prepared in accordance with United States ("U.S.") generally accepted accounting principles ("GAAP") as outlined in the Financial Accounting Standard Board ("FASB") Accounting Standards Codification (the "Codification" or "ASC"), and are presented in our reporting and functional currency, the U.S. dollar. The Codification is the single source of authoritative accounting principles applied by nongovernmental entities in the preparation of financial statements in conformity with GAAP. The consolidated financial statements include the accounts of the Company (including all wholly-owned subsidiaries), as well as all other entities in which the Company has a controlling financial interest. Intercompany transactions and balances have been eliminated in consolidation. Significant investments in businesses, partnerships, and limited liability companies in which the Company does not have a controlling financial interest, but the Company has the ability to exercise significant influence, are accounted for using the equity method. A controlling financial interest in an entity may be established (i) through the Company holding a majority voting interest or (ii) if the Company is the primary beneficiary of an entity that qualifies as a variable interest entity ("VIE"), as defined in the Codification. The Company evaluates all partnerships, joint ventures and other arrangements with variable interests to determine if the entity or arrangement qualifies as a VIE. VIEs are entities where investors lack sufficient equity at risk for the entity to finance its activities without additional subordinated financial support or where equity investors, as a group, lack one of the following characteristics: (a) the power to direct the activities that most significantly impact the entity’s economic performance, (b) the obligation to absorb the expected losses of the entity, or (c) the right to receive the expected returns of the entity. If the entity or arrangement qualifies as a VIE and the Company is determined to be the primary beneficiary, the Company is required to consolidate the assets, liabilities, and results of operations of the VIE. The Company reevaluates whether an entity is a VIE as needed (i.e., when assessing reconsideration events that result in changes in the factors mentioned above) as part of determining if the consolidation or equity method treatment remains appropriate. As of December 31, 2023, the Company had an interest in various unconsolidated joint ventures that the Company accounts for using the equity method. Obligations of the Company's joint ventures do not have recourse to the Company and the Company's maximum exposure is limited to its investment. Use of Estimates: The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported. Estimates and assumptions are used for, but not limited to: (i) asset impairments, including intangible assets and goodwill, (ii) litigation and contingencies, (iii) pension and postretirement estimates, (iv) recoverable amounts of accounts and other receivables, and (v) income taxes. Future results could be materially affected if actual results differ from these estimates and assumptions. Rounding: Amounts in the consolidated financial statements and notes are rounded to the nearest tenth of a million. Accordingly, a recalculation of some per-share amounts and percentages, if based on the reported data, may result in differences. Discontinued Operations: In November 2023, the Company completed the sale of its interests in Grace Pacific LLC ("Grace Pacific"), a materials and construction company, and the Company-owned quarry land on Maui (collectively, the “Grace Disposal Group”), as well as the sale of Grace Pacific's 50% interest in Maui Paving, LLC, a paving company. The assets and liabilities associated with the Grace Disposal Group were classified as held for sale in the consolidated balance sheet as of December 31, 2022, and financial results are classified as discontinued operations in the consolidated statements of operations and cash flows for all periods presented. Refer to Note 21 – Held for Sale and Discontinued Operations for additional information. All footnotes exclude discontinued operations unless otherwise noted. Reclassifications: Certain amounts presented in the prior year have been reclassified to conform to the current year presentation (e.g., captions previously presented in the prior years that, in the currently presented periods, are less than five percent of total assets or total liabilities were combined in the current year consolidated balance sheets). Other property, net, which was previously reported separately on the consolidated balance sheets, is now presented in Prepaid expenses and other assets for all periods presented. The change in Inventories, which was previously reported separately within operating cash flows on the consolidated statements of cash flows, is now presented in Prepaid expenses, income tax receivable and other assets for all periods presented. Segment Reclassifications: The Company continually monitors its reportable segments for changes in facts and circumstances to determine whether changes in the identification or aggregation of operating segments are necessary. Refer to Note 19 – Segment Results for additional information.