Entity tax identification number Entity Tax Identification Number Maximum Maximum [Member] Legal Entity [Axis] Legal Entity [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] EBP, Description of Plan [Table] EBP, Description of Plan [Table] Mutual Funds Mutual Fund [Member] Subsequent Event Subsequent Event [Member] Cost of investment sold EBP, Investment Sold, Excluding Plan Interest in Master Trust, Selling Price EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] Pretax, maximum annual compensation to total compensation, percentage EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Personal Choice Retirement Account EBP, Self-Directed Brokerage Account [Member] Investment contribution, minimum increment, percent EBP, Investment Contribution, Minimum Increment, Percent EBP, Investment Contribution, Minimum Increment, Percent Total deductions EBP, Change in Net Asset Available for Benefit, Decrease Maximum borrowing, amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount INVESTMENTS EBP, Investment, Fair Value and NAV [Text Block] Minimum borrowing, amount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Accrued expenses EBP, Accrued Expense Investments, at fair value Total Investments, at fair value EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Subsequent Event Type [Domain] Subsequent Event Type [Domain] Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] EBP, After Tax Account Contribution EBP, After Tax Account Contribution [Member] EBP, After Tax Account Contribution EBP, Investment, Fair Value and NAV [Abstract] Primary residence, borrowing term EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term Total assets EBP, Asset Assets EBP, Asset [Abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] Additions to net assets attributed to: EBP, Change in Net Asset Available for Benefit, Increase [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Payment of Benefits EBP, Payment to Participant [Policy Text Block] Total liabilities EBP, Liability After tax, minimum annual compensation to total compensation, percentage EBP, Participant Contribution, After Tax, Minimum Annual Contribution to Eligible Compensation, Percentage EBP, Participant Contribution, After Tax, Minimum Annual Contribution to Eligible Compensation, Percentage Automatic deferral rate, annual increase EBP, Participant Contribution, Automatic, Annual Increase Deferral Rate Annual increase in percentage of eligible compensation contributed for participant automatically enrolled in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) until the contribution reaches maximum threshold. Amendment Flag Amendment Flag Participant EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution Basis of Presentation EBP, Basis of Accounting [Policy Text Block] EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] EBP, Description of Plan and Accounting Change [Abstract] EBP, Investment, Fair Value and NAV EBP, Investment, Fair Value and NAV [Table Text Block] Vested account balance for terminated employee, maximum amount for lump sum distribution EBP, Vested Account Balance For Terminated Employee, Maximum Amount For Lump Sum Distribution EBP, Vested Account Balance For Terminated Employee, Maximum Amount For Lump Sum Distribution Investments [Domain] Investments [Domain] Use of Estimates EBP, Use of Estimate [Policy Text Block] Schedule H, Line 4i – Schedule of Assets (Held At End of Year) EBP, Schedule of Asset Held for Investment [Text Block] Cover [Abstract] RISKS AND UNCERTAINTIES EBP, Risk and Uncertainty [Text Block] Employer (net of forfeitures) EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Investment, purchased, number of shares (in shares) EBP, Investment, Purchased, Number of Shares Minimum Minimum [Member] Investment Type [Axis] Investment Type [Axis] Interest on notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Net appreciation in fair value of investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment Interest and dividend income EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] Plan number EBP, Plan Number EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] DESCRIPTION OF THE PLAN EBP, Description of Plan [Text Block] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] Number of consecutive one-year breaks before re-employment for restoration of employer contributions, maximum EBP, Number Of Consecutive One-Year Breaks Before Re-Employment For Restoration Of Employer Contributions, Maximum EBP, Number Of Consecutive One-Year Breaks Before Re-Employment For Restoration Of Employer Contributions, Maximum Humana Unitized Stock Fund/Humana Common Stock EBP, Employer, Common Stock [Member] EBP, Schedule of Asset Held for Investment [Abstract] EBP, Employee Contribution, Type [Axis] EBP, Employee Contribution, Type [Axis] EBP, Employee Contribution, Type EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Total additions EBP, Change in Net Asset Available for Benefit, Increase Note receivable from participant, allowance for credit loss EBP, Note Receivable from Participant, Allowance for Credit Loss Investment income: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Investment, Identifier [Axis] Investment, Identifier [Axis] Administrative expenses EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Total EBP, Asset Held for Investment Document Information [Line Items] Document Information [Line Items] EBP, Risk and Uncertainty [Line Items] EBP, Risk and Uncertainty [Line Items] EBP, Risk and Uncertainty [Table] EBP, Risk and Uncertainty [Table] Participant compensation matched, percentage EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Investment sold, number of shares (in shares) EBP, Investment, Sold, Number of Shares Vesting period EBP, Employer Contribution Vesting Service Period Minimum Vesting service period for company contribution and/ or investment earning to the participant in Company Matching Contributions, Fixed Rate Contributions, Discretionary Profit-Sharing Contributions, Qualified Non-Elective Contributions, and Disability Contributions. General loan, borrowing term EBP, Note Receivable From Participant, General Loan, Borrowing Term EBP, Note Receivable From Participant, General Loan, Borrowing Term EBP 004 EBP 004 [Member] EBP 004 Subsequent Event Type [Axis] Subsequent Event Type [Axis] EBP, Tax Status [Table] EBP, Tax Status [Table] Net increase EBP, Change in Net Asset Available for Benefit, Increase (Decrease) RELATED PARTY AND PARTY-IN-INTEREST TRANSACTIONS EBP, Related Party and Party-in-Interest Transactions [Text Block] EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Total receivables EBP, Receivable Employer contributions receivable EBP, Employer Contribution, Receivable EBP, Employer, Common Stock And Common Stock Fund Humana Unitized Stock Fund EBP, Employer, Common Stock And Common Stock Fund [Member] EBP, Employer, Common Stock And Common Stock Fund Automatic deferral rate EBP, Participant Contribution, Automatic, Deferral Rate Benefits paid to participants EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Maximum annual compensation to total compensation, percentage EBP, Participant Contribution, Maximum Annual Compensation to Total Compensation, Percentage EBP, Participant Contribution, Maximum Annual Compensation to Total Compensation, Percentage Investment, current value EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Vesting percentage EBP, Employer Contribution Vesting Percentage EBP, Employer Contribution Vesting Percentage EBP, Statement of Net Asset Available for Benefit [Abstract] Pretax, minimum annual compensation to total compensation, percentage EBP, Participant Contribution, Pretax, Minimum Annual Compensation to Total Compensation, Percentage EBP, Participant Contribution, Pretax, Minimum Annual Compensation to Total Compensation, Percentage EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] Payroll period from date pf hire EBP, Participant Contribution, Automatic, Payroll Period From Date Of Hire EBP, Participant Contribution, Automatic, Payroll Period From Date Of Hire Participant compensation matched, minimum service period EBP, Requisite Service Period EBP, Requisite Service Period EBP, Tax Status [Abstract] Humana Unitized Stock Fund / Money Market Fund EBP, Employer, Common Stock Fund [Member] Cash and cash equivalents EBP, Noninterest-Bearing Cash Administrative Expenses EBP, Expense [Policy Text Block] Notes receivable from participants, current value EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Investment Valuation and Income Recognition EBP, Investment [Policy Text Block] Participant contributions receivable EBP, Participant Contribution, Receivable Fair Value, Inputs, Level 1, Level 2, and Level 3 Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Document Type Document Type Entity Central Index Key Entity Central Index Key Participant loan, interest rate EBP, Asset Held for Investment, Participant Loan, Interest Rate Common/Collective Trust Funds Common Collective Trust [Member] Net assets available for benefits: EBP, Net Asset Available for Benefit [Abstract] EBP, Risk and Uncertainty [Abstract] EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] Deductions from net assets attributed to: EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Forfeited nonvested account, decrease from employer contribution EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Notes receivable from participants EBP, Note Receivable from Participant Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES EBP, Summary of Accounting Policy [Text Block] Entity Registrant Name Entity Registrant Name Cost of investment purchased EBP, Investment Acquired, Excluding Plan Interest in Master Trust, Cost Liabilities EBP, Liability [Abstract] Nonvested account, break in service forfeiture period EBP, Nonvested Account, Break In Service Forfeiture Period EBP, Nonvested Account, Break In Service Forfeiture Period INCOME TAX STATUS EBP, Tax Status [Text Block] Maximum borrowing, to total account, percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Concentration of investment at fair value to total investments, percentage EBP, Risk and Uncertainty, Concentration of Investment at Fair Value to Total Investments, Percentage Document Information [Table] Document Information [Table] After tax, maximum annual compensation to total compensation, percentage EBP, Participant Contribution, After Tax, Maximum Annual Contribution to Eligible Compensation, Percentage EBP, Participant Contribution, After Tax, Maximum Annual Contribution to Eligible Compensation, Percentage Notes Receivable from Participants EBP, Note Receivable from Participant [Policy Text Block] Total investment income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] Net assets available for benefits Beginning of year End of year EBP, Net Asset Available for Benefit Entity [Domain] Entity [Domain] Vested account balance for terminated employee, minimum amount for leaving in plan EBP, Vested Account Balance For Terminated Employee, Minimum Amount For Leaving In Plan EBP, Vested Account Balance For Terminated Employee, Minimum Amount For Leaving In Plan Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Forfeited nonvested account EBP, Forfeited Nonvested Account Matching percentage EBP, Employer Contribution, Matching Percentage NAV Fair Value Measured at Net Asset Value Per Share [Member] EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] Consecutive break period for restoration of employer contributions EBP, Consecutive Break Period For Restoration Of Employer Contributions EBP, Consecutive Break Period For Restoration Of Employer Contributions EBP, Employee Contribution, Type [Domain] EBP, Employee Contribution, Type [Domain] EBP, Employer Contribution, Type [Domain] EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items]