Entity Tax Identification Number Entity Tax Identification Number Participant transfers from other plans EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Maximum Maximum [Member] Changes in deemed distributions EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Increase (Decrease) from Deemed Distribution Legal Entity [Axis] Legal Entity [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] EBP, Description of Plan [Table] EBP, Description of Plan [Table] Mutual Fund Mutual Fund [Member] Entities [Table] Entities [Table] Subsequent Events Subsequent Event [Member] Fidelity Fidelity [Member] Fidelity EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] Administrative fees (Note 1) EBP, Change in Net Asset Available for Benefit, Increase from Administrative Credit EBP, Change in Net Asset Available for Benefit, Increase from Administrative Credit EBP, Change in Net Asset Available for Benefit, Increase from Administrative Credit EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage EBP, Note Receivable from Participant, Account, Additional Interest EBP, Note Receivable from Participant, Account, Additional Interest EBP, Note Receivable from Participant, Account, Additional Interest EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount FAIR VALUE MEASUREMENTS EBP, Investment, Fair Value and NAV [Text Block] EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Investments, at fair value EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Subsequent Event Type [Domain] Subsequent Event Type [Domain] Fair Value, Inputs, Level 1 Fair Value, Inputs, Level 1 [Member] EBP, Net Asset Value per Share or Unit EBP, Net Asset Value per Share or Unit EBP, Investment, Fair Value and NAV [Abstract] Schedule of Parties-in-Interest Transactions EBP, Related Party and Party-in-Interest Transactions [Table Text Block] Excess Contributions Payable EBP, Excess Contribution Payable [Policy Text Block] Total assets EBP, Asset Assets: EBP, Asset [Abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Distributions EBP, Payment to Participant [Policy Text Block] EBP, Note Receivable from Participant, Account, Maturity Period for General Purpose Loans EBP, Note Receivable from Participant, Account, Maturity Period for General Purpose Loans EBP, Note Receivable from Participant, Account, Maturity Period for General Purpose Loans Amendment Flag Amendment Flag Deemed distributions EBP, Reconciliation to Form 5500, Net Asset Available for Benefit, Deemed Distribution EBP, Aggregate Limit Prescribed by IRS for Participants Under Age 50 EBP, Aggregate Participant Contribution Limit Prescribed by IRS for Participants Under Age 50 EBP, Aggregate Limit Prescribed by IRS for Participants Under Age 50 EBP, Asset Held for Investment, Participant Loans, Number of Loans Outstanding EBP, Asset Held for Investment, Participant Loans, Number of Loans Outstanding EBP, Asset Held for Investment, Participant Loans, Number of Loans Outstanding 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, Investment, Number of Shares EBP, Investment, Number of Shares EBP, Description of Plan and Accounting Change [Abstract] EBP, Investment Liability, Fair Value EBP, Investment Liability, Fair Value Schedule of EBP, Investment, Fair Value and NAV EBP, Investment, Fair Value and NAV [Table Text Block] EBP, Asset Held for Investment, Participant Loan, Maturity Period EBP, Asset Held for Investment, Participant Loan, Maturity Period EBP, Asset Held for Investment, Participant Loan, Maturity Period EBP, Reconciliation of Net Assets to Form 5500 EBP, Reconciliation of Net Assets Available for Plan Benefits to Form 5500 [Table Text Block] EBP, Reconciliation of Net Assets Available for Plan Benefits to Form 5500 Investments [Domain] Investments [Domain] EBP, Participant Contribution, Maximum, Deferral Rate EBP, Participant Contribution, Automatic, Deferral Rate, Annual Increase Maximum EBP, Participant Contribution, Automatic, Deferral Rate, Annual Increase Maximum Use of Estimates EBP, Use of Estimate [Policy Text Block] EBP, Related Party and Party-in-Interest [Domain] EBP, Related Party and Party-in-Interest [Domain] SCHEDULE H - SCHEDULE OF ASSETS (HELD AT END OF YEAR) EBP, Schedule of Asset Held for Investment [Text Block] Cover [Abstract] EBP, Unused Administrative Revenue Credit EBP, Revenue Credit Account EBP, Revenue Credit Account Employer contributions EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash EBP, Related Party and Party-in-Interest [Axis] EBP, Related Party and Party-in-Interest [Axis] Minimum Minimum [Member] Investment Type [Axis] Investment Type [Axis] Total contributions and transfers EBP, Change in Net Asset Available for Benefit, Increase from Contribution Participant withholdings EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Net appreciation in fair value of investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] EBP, Plan Number EBP, Plan Number Schedule of Vesting Percentage Employee Benefit Plan, Vesting Schedule [Table Text Block] Employee Benefit Plan, Vesting Schedule 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, Investment, Issuer Name [Extensible Enumeration] EBP, Investment, Issuer Name [Extensible Enumeration] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Note Receivable from Participant, Account, Maturity Period for Loans Made to Purchase Principal Residence EBP, Note Receivable from Participant, Account, Maturity Period for Loans Made to Purchase Principal Residence EBP, Note Receivable from Participant, Account, Maturity Period for Loans Made to Purchase Principal Residence EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] Interest on participant loans EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Investment EBP, Schedule of Asset Held for Investment [Abstract] EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] EBP, Asset Held for Investment, Participant Loan, Cost of Loan EBP, Asset Held for Investment, Participant Loan, Cost of Loan EBP, Asset Held for Investment, Participant Loan, Cost of Loan Net increase in net assets available for plan benefits per the financial statements EBP, Change in Net Asset Available for Benefit, Increase Investment, Identifier [Axis] Investment, Identifier [Axis] Aflac Incorporated Common Stock Aflac Incorporated Common Stock [Member] Aflac Incorporated Common Stock EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense EBP, Asset Held for Investment EBP, Asset Held for Investment EBP, Vesting Percentage, Years of Service, Four Years EBP, Vesting Percentage, Years of Service, Four Years EBP, Vesting Percentage, Years of Service, Four Years EBP, Vesting Percentage on Plan Termination EBP, Vesting Percentage on Plan Termination EBP, Vesting Percentage on Plan Termination EBP, Aggregate Limit Prescribed by IRS for Participants Age 60-63 EBP, Aggregate Participant Contribution Limit Prescribed by IRS for Participants Age 60-63 EBP, Aggregate Participant Contribution Limit Prescribed by IRS for Participants Age 60-63 EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Participant Contribution, Automatic Annual Increase, Deferral Rate EBP, Participant Contribution, Automatic, Deferral Rate, Annual Increase EBP, Participant Contribution, Automatic, Deferral Rate, Annual Increase EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Fair Value, Inputs, Level 2 Fair Value, Inputs, Level 2 [Member] EBP, Vesting Percentage, Years of Service, Five Years or More EBP, Vesting Percentage, Years of Service, Five Years or More EBP, Vesting Percentage, Years of Service, Five Years or More Fidelity Stock Selector Small Cap Fund Fidelity Stock Selector Small Cap Fund [Member] Fidelity Stock Selector Small Cap Fund Net income per the Form 5500 EBP, Form 5500 Caption, Net Income (Loss) Subsequent Event Type [Axis] Subsequent Event Type [Axis] Net increase in net assets Net increase in net assets available for plan benefits per the financial statements EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Entity Information [Line Items] Entity Information [Line Items] EBP 004 EBP 004 [Member] EBP 004 EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Text Block [Abstract] Accrued employer contribution EBP, Employer Contribution, Receivable EBP, Participant Contribution, Automatic, Deferral Rate EBP, Participant Contribution, Automatic, Deferral Rate Distributions to participants EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Dividend and interest income EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value EBP, Vesting Percentage, Years of Service, One Year EBP, Vesting Percentage, Years of Service, One Year EBP, Vesting Percentage, Years of Service, One Year Other Receivables EBP, Other Receivables [Policy Text Block] EBP, Other Receivables Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] EBP, Vesting Percentage, Years of Service, Three Years EBP, Vesting Percentage, Years of Service, Three Years EBP, Vesting Percentage, Years of Service, Three Years EBP, Participant Contribution, Vesting Percentage EBP, Participant Contribution, Vesting Percentage EBP, Participant Contribution, Vesting Percentage EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Reconciliation of Changes in Net Assets to Form 5500 EBP, Reconciliation of Changes in Net Assets Available for Plan Benefits to Form 5500 [Table Text Block] EBP, Reconciliation of Changes in Net Assets Available for Plan Benefits to Form 5500 EBP, Investment, Current Value, Type [Extensible Enumeration] EBP, Investment, Current Value, Type [Extensible Enumeration] EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] EBP, Tax Status [Abstract] EBP, Employer, Common Stock Fund EBP, Employer, Common Stock Fund [Member] Document Period End Date Document Period End Date EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Plan Name EBP, Plan Name EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] Fidelity Balanced Fund Fidelity Balanced Fund [Member] Fidelity Balanced Fund Expenses EBP, Expense [Policy Text Block] RECONCILIATION OF FINANCIAL STATEMENTS TO FORM 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Text Block] EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Investment Valuation and Income Recognition EBP, Investment [Policy Text Block] Accrued participant contribution EBP, Participant Contribution, Receivable EBP, Asset Held for Investment, Party-in-Interest [true false] EBP, Asset Held for Investment, Party-in-Interest [true false] Document Type Document Type PLAN TERMINATION EBP, Plan Termination [Text Block] Entity Central Index Key Entity Central Index Key EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, Reconciliation of Financial Statement to Form 5500 [Abstract] Common Collective Trust Common Collective Trust [Member] Contributions and transfers: EBP, Net Asset Available for Benefit [Abstract] EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] EBP, Subsequent Event [Table] EBP, Subsequent Event [Table] EBP, 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] Fidelity Total Bond Fund Fidelity Total Bond Fund [Member] Fidelity Total Bond Fund SUMMARY OF ACCOUNTING POLICIES EBP, Summary of Accounting Policy [Text Block] Entity Registrant Name Entity Registrant Name EBP, Vesting Percentage, Years of Service, Less Than One Year EBP, Employer Contribution, Vesting Percentage, Years of Service, Less than One Year EBP, Employer Contribution, Vesting Percentage, Years of Service, Less than One Year EBP, Subsequent Event [Abstract] SUBSEQUENT EVENTS EBP, Subsequent Event [Text Block] FEDERAL INCOME TAXES EBP, Tax Status [Text Block] EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage EBP, Dividends Received EBP, Dividends Received EBP, Dividends Received EBP, Employer Nonelective Contribution EBP, Employer Contribution, Participant Compensation Matched, Nonelective, Percentage EBP, Employer Contribution, Participant Compensation Matched, Nonelective, Percentage EBP, Subsequent Event [Line Items] EBP, Subsequent Event [Line Items] Fidelity U.S. Bond Index Fund Fidelity U.S. Bond Index Fund [Member] Fidelity U.S. Bond Index Fund Notes Receivable from Participants EBP, Note Receivable from Participant [Policy Text Block] EBP, Aggregate Limit Prescribed by IRS for Participants Aged 50-59 or 64 EBP, Aggregate Participant Contribution Limit Prescribed by IRS for Participants Age 50-59 or 64 and Over EBP, Aggregate Participant Contribution Limit Prescribed by IRS for Participants Age 50-59 or 64 and Over EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] Fair Value, Inputs, Level 3 Fair Value, Inputs, Level 3 [Member] EBP, Vesting Percentage, Years of Service, Two Years EBP, Vesting Percentage, Years of Service, Two Years EBP, Vesting Percentage, Years of Service, Two Years Other receivables EBP, Other Receivable Net assets available for plan benefits Beginning of year End of year Net assets available for plan benefits per the financial statements EBP, Net Asset Available for Benefit Entity [Domain] Entity [Domain] EBP, Forfeited Nonvested Account EBP, Forfeited Nonvested Account EBP, Employer Contribution, Matching Percentage EBP, Employer Contribution, Matching Percentage Net assets available for plan benefits per the Form 5500 EBP, Form 5500 Caption, Net Assets EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items] Vanguard Equity Income Fund, Admiral [Member] Vanguard Equity Income Fund, Admiral Vanguard Federal Money Market Fund [Member] Vanguard Federal Money Market Fund Vanguard Inflation-Protected Securities Fund, Admiral [Member] Vanguard Inflation-Protected Securities Fund, Admiral American Funds Europacific Growth Fund, R6 [Member] American Funds Europacific Growth Fund, R6 JPMorgan Large Cap Growth Fund, R6 [Member] JPMorgan Large Cap Growth Fund, R6 T. Rowe Price Stable Value Common Trust Fund [Member] T. Rowe Price Stable Value Common Trust Fund T. Rowe Price Retirement Blend 2005 Trust Class B [Member] T. Rowe Price Retirement Blend 2005 Trust Class B T. Rowe Price Retirement Blend 2010 Trust Class B [Member] T. Rowe Price Retirement Blend 2010 Trust Class B T. Rowe Price Retirement Blend 2015 Trust Class B [Member] T. Rowe Price Retirement Blend 2015 Trust Class B T. Rowe Price Retirement Blend 2020 Trust Class B [Member] T. Rowe Price Retirement Blend 2020 Trust Class B T. Rowe Price Retirement Blend 2025 Trust Class B [Member] T. Rowe Price Retirement Blend 2025 Trust Class B T. Rowe Price Retirement Blend 2030 Trust Class B [Member] T. Rowe Price Retirement Blend 2030 Trust Class B T. Rowe Price Retirement Blend 2035 Trust Class B [Member] T. Rowe Price Retirement Blend 2035 Trust Class B T. Rowe Price Retirement Blend 2040 Trust Class B [Member] T. Rowe Price Retirement Blend 2040 Trust Class B T. Rowe Price Retirement Blend 2045 Trust Class B [Member] T. Rowe Price Retirement Blend 2045 Trust Class B T. Rowe Price Retirement Blend 2050 Trust Class B [Member] T. Rowe Price Retirement Blend 2050 Trust Class B T. Rowe Price Retirement Blend 2055 Trust Class B [Member] T. Rowe Price Retirement Blend 2055 Trust Class B T. Rowe Price Retirement Blend 2060 Trust Class B [Member] T. Rowe Price Retirement Blend 2060 Trust Class B T. Rowe Price Retirement Blend 2065 Trust Class B [Member] T. Rowe Price Retirement Blend 2065 Trust Class B T. Rowe Price U.S. Treasury Money Market Trust [Member] T. Rowe Price U.S. Treasury Money Market Trust T. Rowe Price U.S. Mid-Cap Growth Equity Trust Class D [Member] T. Rowe Price U.S. Mid-Cap Growth Equity Trust Class D T. Rowe Price U.S. Mid-Cap Value Equity Trust Class D [Member] T. Rowe Price U.S. Mid-Cap Value Equity Trust Class D Spartan 500 Index Pool Class C [Member] Spartan 500 Index Pool Class C Spartan Global ex US Index Pool Class C [Member] Spartan Global ex US Index Pool Class C Spartan Extended Market Index Pool Class C [Member] Spartan Extended Market Index Pool Class C Common Stock [Member]