BASIS OF PRESENTATION, UPDATED ACCOUNTING POLICIES AND ACCOUNTING CHANGES (Policies)	6 Months Ended
Jun. 30, 2025
Accounting Policies [Abstract]
Basis of Presentation	The accompanying unaudited Consolidated Financial Statements as of June 30, 2025 and for the three and six months ended June 30, 2025 and 2024 include the accounts of Citigroup Inc. and its consolidated subsidiaries. In the opinion of management, all adjustments, consisting of normal recurring adjustments, necessary for a fair presentation have been reflected. The accompanying unaudited Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and related notes included within Citigroup’s Annual Report on Form 10-K for the year ended December 31, 2024 (2024 Form 10-K) and Citigroup’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2025 (First Quarter of 2025 Form 10-Q). Certain financial information that is usually included in annual financial statements prepared in accordance with U.S. generally accepted accounting principles (GAAP), but is not required for interim reporting purposes, has been condensed or omitted. Management must make estimates and assumptions that affect the Consolidated Financial Statements and the related footnote disclosures. While management uses its best judgment, actual results could differ from those estimates. As noted above, the Notes to these Consolidated Financial Statements are unaudited. Throughout these Notes, “Citigroup,” “Citi” and “the Company” refer to Citigroup Inc. and its consolidated subsidiaries.
Reclassifications	Certain reclassifications and updates have been made to the prior periods’ financial statements and notes to conform to the current period’s presentation.
Cash Equivalents	Cash equivalents are defined as those amounts included in Cash and due from banks and predominately all of Deposits with banks. Cash flows from risk management activities are classified in the same category as the related assets and liabilities. Amounts included in Cash and due from banks and Deposits with banks approximate fair value.
Accounting Changes and Future Accounting Changes	ACCOUNTING CHANGES Income Taxes (Topic 740): Improvements to Income Tax Disclosures In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, intended to enhance the transparency and decision usefulness of income tax disclosures. This guidance requires that public business entities disclose on an annual basis a tabular rate reconciliation in eight specific categories disaggregated by nature and for foreign tax effects by each jurisdiction that meets a 5% of pretax income multiplied by the applicable statutory tax rate or greater threshold annually. The eight categories include state and local income taxes, net of federal income tax effect; foreign tax effects; enactment of new tax laws; enactment of new tax credits; effect of cross-border tax laws; valuation allowances; nontaxable items and nondeductible items; and changes in unrecognized tax benefits. Additional disclosures include qualitative description of the state and local jurisdictions that contribute to the majority (greater than 50%) of the effect of the state and local income tax category and explanation of the nature and effect of changes in individual reconciling items. The guidance also requires entities annually to disclose income taxes paid (net of refunds received) disaggregated by federal, state and foreign taxes and by jurisdiction identified based on the same 5% quantitative threshold. The standard is effective for fiscal years beginning after December 15, 2024. The transition method is prospective with the retrospective method permitted. Citi plans to adopt the ASU for the year ending December 31, 2025. See Note 1 to the Consolidated Financial Statements in Citi’s 2024 Form 10-K for a discussion of 2024 accounting changes. FUTURE ACCOUNTING CHANGES Identifying the Acquirer in a Business Combination In May 2025, the FASB issued ASU No. 2025-03, Business Combinations (Topic 805) and Consolidation (Topic 810): Determining the Accounting Acquirer in the Acquisition of a Variable Interest Entity, intended to clarify the guidance for identifying the accounting acquirer when the legal acquiree is a variable interest entity that meets the definition of a business. The revised guidance requires entities to consider the factors in Topic 805 when a business combination involving a VIE is effected primarily by exchanging equity interests in which a VIE is acquired. The ASU will be effective for fiscal years beginning after December 15, 2026, and interim periods within those fiscal years. Citi is currently evaluating the impact of the ASU. Adoption of the ASU is not expected to have a material impact on Citi’s operating results or financial position. Disaggregation of Income Statement Expenses In November 2024, the FASB issued ASU No. 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40), to improve the disclosures of expenses by requiring public business entities to provide further disaggregation of relevant expense captions (i.e., employee compensation, depreciation, intangible asset amortization) in a separate note to the financial statements, a qualitative description of the amounts remaining in relevant expense captions that are not separately disaggregated quantitatively, and the total amount of selling expenses and, in an annual reporting period, an entity’s definition of selling expenses. The transition method is prospective with the retrospective method permitted, and the ASU will be effective for Citi for its annual period ending December 31, 2027 and interim periods for the interim period beginning January 1, 2028. Citi is currently evaluating the impact on its disclosures.

BASIS OF PRESENTATION, UPDATED ACCOUNTING POLICIES AND ACCOUNTING CHANGES (Policies)

6 Months Ended

Jun. 30, 2025

The accompanying unaudited Consolidated Financial Statements as of June 30, 2025 and for the three and six months ended June 30, 2025 and 2024 include the accounts of Citigroup Inc. and its consolidated subsidiaries.

In the opinion of management, all adjustments, consisting of normal recurring adjustments, necessary for a fair presentation have been reflected. The accompanying unaudited Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and related notes included within Citigroup’s Annual Report on Form 10-K for the year ended December 31, 2024 (2024 Form 10-K) and Citigroup’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2025 (First Quarter of 2025 Form 10-Q).

Certain financial information that is usually included in annual financial statements prepared in accordance with U.S. generally accepted accounting principles (GAAP), but is not required for interim reporting purposes, has been condensed or omitted.

Management must make estimates and assumptions that affect the Consolidated Financial Statements and the related footnote disclosures. While management uses its best judgment, actual results could differ from those estimates.

As noted above, the Notes to these Consolidated Financial Statements are unaudited.

Throughout these Notes, “Citigroup,” “Citi” and “the Company” refer to Citigroup Inc. and its consolidated subsidiaries.

Reclassifications

Certain reclassifications and updates have been made to the prior periods’ financial statements and notes to conform to the current period’s presentation.

Cash Equivalents

Cash equivalents are defined as those amounts included in Cash and due from banks and predominately all of Deposits with banks. Cash flows from risk management activities are classified in the same category as the related assets and liabilities. Amounts included in Cash and due from banks and Deposits with banks approximate fair value.

Accounting Changes and Future Accounting Changes

ACCOUNTING CHANGES

Income Taxes (Topic 740): Improvements to Income Tax Disclosures

In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, intended to enhance the transparency and decision usefulness of income tax disclosures. This guidance requires that public business entities disclose on an annual basis a tabular rate reconciliation in eight specific categories disaggregated by nature and for foreign tax effects by each jurisdiction that meets a 5% of pretax income multiplied by the applicable statutory tax rate or greater threshold annually. The eight categories include state and local income taxes, net of federal income tax effect; foreign tax effects; enactment of new tax laws; enactment of new tax credits; effect of cross-border tax laws; valuation allowances; nontaxable items and nondeductible items; and changes in unrecognized tax benefits. Additional disclosures include qualitative description of the state and local jurisdictions that contribute to the majority (greater than 50%) of the effect of the state and local income tax category and explanation of the nature and effect of changes in individual reconciling items. The guidance also requires entities annually to disclose income taxes paid (net of refunds received) disaggregated by federal, state and foreign taxes and by jurisdiction identified based on the same 5% quantitative threshold.

The standard is effective for fiscal years beginning after December 15, 2024. The transition method is prospective with the retrospective method permitted. Citi plans to adopt the ASU for the year ending December 31, 2025.

See Note 1 to the Consolidated Financial Statements in Citi’s 2024 Form 10-K for a discussion of 2024 accounting changes.

FUTURE ACCOUNTING CHANGES

Identifying the Acquirer in a Business Combination

In May 2025, the FASB issued ASU No. 2025-03, Business Combinations (Topic 805) and Consolidation (Topic 810): Determining the Accounting Acquirer in the Acquisition of a Variable Interest Entity, intended to clarify the guidance for identifying the accounting acquirer when the legal acquiree is a variable interest entity that meets the definition of a business. The revised guidance requires entities to consider the factors in Topic 805 when a business combination involving a VIE is effected primarily by exchanging equity interests in which a VIE is acquired.

The ASU will be effective for fiscal years beginning after December 15, 2026, and interim periods within those fiscal years. Citi is currently evaluating the impact of the ASU. Adoption of the ASU is not expected to have a material impact on Citi’s operating results or financial position.

Disaggregation of Income Statement Expenses

In November 2024, the FASB issued ASU No. 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40), to improve the disclosures of expenses by requiring public business entities to provide further disaggregation of relevant expense captions (i.e., employee compensation, depreciation, intangible asset amortization) in a separate note to the financial statements, a qualitative description of the amounts remaining in relevant expense captions that are not separately disaggregated quantitatively, and the total amount of selling expenses and, in an annual reporting period, an entity’s definition of selling expenses.

The transition method is prospective with the retrospective method permitted, and the ASU will be effective for Citi for its annual period ending December 31, 2027 and interim periods for the interim period beginning January 1, 2028. Citi is currently evaluating the impact on its disclosures.