BASIS OF PRESENTATION AND SIGNIFICANT EVENTS (Policies)	9 Months Ended
BASIS OF PRESENTATION AND SIGNIFICANT EVENTS (Policies)	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	The accompanying condensed consolidated financial statements are presented in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the disclosures normally required by accounting principles generally accepted in the United States of America, or GAAP, or those normally made in an Annual Report on Form 10-K. The year-end condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by GAAP. For further information, the reader of this Form 10-Q should refer to our Form 10-K for the year ended December 31, 2020, that was filed with the Securities and Exchange Commission, or the SEC, on February 18, 2021. We refer to the Form 10-K as the “2020 Form 10-K” in this document. References throughout this document to “we,” “us,” “our,” “Company,” and “Humana” mean Humana Inc. and its subsidiaries. The preparation of our condensed consolidated financial statements in accordance with GAAP requires us to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. The areas involving the most significant use of estimates are the estimation of benefits payable, the impact of risk adjustment provisions related to our Medicare contracts, the valuation and related impairment recognition of investment securities, and the valuation and related impairment recognition of long-lived assets, including goodwill. These estimates are based on knowledge of current events and anticipated future events, and accordingly, actual results may ultimately differ materially from those estimates. Refer to Note 2 to the consolidated financial statements included in our 2020 Form 10-K for information on accounting policies that we consider in preparing our consolidated financial statements. Since the filing of our 2020 Form 10-K we have acquired noncontrolling interest and indefinite-lived intangible assets as part of our acquisition of Kindred at Home, or KAH, during the third quarter of 2021. See Note 3 for further information. We have updated our accounting policies accordingly. The financial information has been prepared in accordance with our customary accounting practices and has not been audited. In our opinion, the information presented reflects all adjustments necessary for a fair statement of interim results. All such adjustments are of a normal and recurring nature.
Indefinite-lived Assets	Indefinite-lived Assets We are required to annually compare the fair values of other indefinite-lived intangible assets to their carrying amounts. If the carrying amount of an indefinite-lived intangible asset exceeds its fair value, an impairment loss is recognized. Fair values of indefinite-lived intangible assets are determined based on the income approach.
Noncontrolling Interests	Noncontrolling Interests The consolidated financial statements include all assets, liabilities, revenues and expenses of less than 100% owned affiliates that we control. Accordingly, we record noncontrolling interests in the earnings and equity of such entities. We record adjustments to noncontrolling interests for the allocable portion of income or loss to which the noncontrolling interest holders are entitled based upon their portion of the subsidiaries they own. Distributions to holders of noncontrolling interests are adjusted to the respective noncontrolling interest holders’ balances. Noncontrolling interests, which relate to the minority ownership held by third party investors in certain of our Home Health Solutions business, are reported below net income under the heading “Net income attributable to noncontrolling interest” in the condensed consolidated statements of income and presented as a component of equity in the condensed consolidated balance sheets.
Revenue Recognition	Revenue RecognitionOur revenues include premium and service revenues. Service revenues include administrative service fees that are recorded based upon established per member per month rates and the number of members for the month and are recognized as services are provided for the month. Additionally, service revenues include net patient service revenues that are recorded based upon established billing rates, less allowances for contractual adjustments, and are recognized as services are provided.
Recently Issued Accounting Pronouncements	In September 2018, the FASB issued new guidance related to accounting for long-duration contracts of insurers which revises key elements of the measurement models and disclosure requirements for long-duration contracts issued by insurers, including the amortization of deferred contract acquisition costs and the measurement of liabilities for future policy benefits using current, rather than locked-in assumptions. The new guidance is effective for us beginning with annual and interim periods in 2023, with earlier adoption permitted, and are to be applied to contracts in force or at the beginning of the earliest period presented, with an option to apply retrospectively with a cumulative effect adjustment to the opening balances of retained earnings as of the earliest period presented. We are currently evaluating the impact on our results of operations, financial position and cash flows. There are no other recently issued accounting standards that apply to us or that are expected to have a material impact on our results of operations, financial condition, or cash flows.