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BNY MELLON CALIFORNIA AMT-FREE MUNICIPAL BOND FUND, INC.  
Risk/Return: rr_RiskReturnAbstract  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock

November 22, 2021

BNY MELLON CALIFORNIA AMT-FREE MUNICIPAL BOND FUND, INC.

Supplement to Current Summary Prospectus and Prospectus
Risk/Return [Heading] rr_RiskReturnHeading BNY MELLON CALIFORNIA AMT-FREE MUNICIPAL BOND FUND, INC.
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

Effective December 1, 2021, the following information supersedes and replaces any contrary information contained in "Fees and Expenses" in the fund's summary prospectus and "Fund Summary - Fees and Expenses" in the fund's prospectus:
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination Sep. 30, 2022
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The Example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the fund for the time periods indicated. The Example also assumes that your investment has a 5% return each year and that the fund's operating expenses remain the same. The one-year example and the first year of the three-, five- and ten-years examples are based on net operating expenses, which reflect the fee waiver agreement by BNY Mellon Investment Adviser, Inc. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
BNY MELLON CALIFORNIA AMT-FREE MUNICIPAL BOND FUND, INC. | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.50%
Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price) rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Management fees rr_ManagementFeesOverAssets 0.60%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder services fees rr_Component1OtherExpensesOverAssets 0.25%
Miscellaneous other expenses rr_Component2OtherExpensesOverAssets 0.11% [2]
Total other expenses rr_OtherExpensesOverAssets 0.36%
Total annual fund operating expenses rr_ExpensesOverAssets 0.96%
Fee waiver rr_FeeWaiverOrReimbursementOverAssets (0.05%) [3]
Total annual fund operating expenses (after fee waiver) rr_NetExpensesOverAssets 0.91%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Class A shares bought without an initial sales charge as part of an investment of $1 million or more may be charged a deferred sales charge of 1.00% if redeemed within one year.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 539
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 737
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 952
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,571
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 539
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 737
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 952
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,571
BNY MELLON CALIFORNIA AMT-FREE MUNICIPAL BOND FUND, INC. | Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management fees rr_ManagementFeesOverAssets 0.60%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.75%
Shareholder services fees rr_Component1OtherExpensesOverAssets 0.25%
Miscellaneous other expenses rr_Component2OtherExpensesOverAssets 0.12% [2]
Total other expenses rr_OtherExpensesOverAssets 0.37%
Total annual fund operating expenses rr_ExpensesOverAssets 1.72%
Fee waiver rr_FeeWaiverOrReimbursementOverAssets (0.05%) [3]
Total annual fund operating expenses (after fee waiver) rr_NetExpensesOverAssets 1.67%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 270
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 537
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 929
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,026
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 170
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 537
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 929
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,026
BNY MELLON CALIFORNIA AMT-FREE MUNICIPAL BOND FUND, INC. | Class I  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management fees rr_ManagementFeesOverAssets 0.60%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder services fees rr_Component1OtherExpensesOverAssets none
Miscellaneous other expenses rr_Component2OtherExpensesOverAssets 0.11% [2]
Total other expenses rr_OtherExpensesOverAssets 0.11%
Total annual fund operating expenses rr_ExpensesOverAssets 0.71%
Fee waiver rr_FeeWaiverOrReimbursementOverAssets (0.05%) [3]
Total annual fund operating expenses (after fee waiver) rr_NetExpensesOverAssets 0.66%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 67
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 222
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 390
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 878
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 67
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 222
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 390
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 878
BNY MELLON CALIFORNIA AMT-FREE MUNICIPAL BOND FUND, INC. | Class Y  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management fees rr_ManagementFeesOverAssets 0.60%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder services fees rr_Component1OtherExpensesOverAssets none
Miscellaneous other expenses rr_Component2OtherExpensesOverAssets 0.10% [2]
Total other expenses rr_OtherExpensesOverAssets 0.10%
Total annual fund operating expenses rr_ExpensesOverAssets 0.70%
Fee waiver rr_FeeWaiverOrReimbursementOverAssets (0.05%) [3]
Total annual fund operating expenses (after fee waiver) rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 219
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 385
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 866
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 66
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 219
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 385
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 866
BNY MELLON CALIFORNIA AMT-FREE MUNICIPAL BOND FUND, INC. | Class Z  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management fees rr_ManagementFeesOverAssets 0.60%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder services fees rr_Component1OtherExpensesOverAssets 0.04%
Miscellaneous other expenses rr_Component2OtherExpensesOverAssets 0.10% [2]
Total other expenses rr_OtherExpensesOverAssets 0.14%
Total annual fund operating expenses rr_ExpensesOverAssets 0.74%
Fee waiver rr_FeeWaiverOrReimbursementOverAssets (0.05%) [3]
Total annual fund operating expenses (after fee waiver) rr_NetExpensesOverAssets 0.69%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 70
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 232
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 407
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 914
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 70
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 232
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 407
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 914
[1] Class A shares bought without an initial sales charge as part of an investment of $1 million or more may be charged a deferred sales charge of 1.00% if redeemed within one year.
[2] Includes interest expense in the amount of .02% in connection with inverse floater securities.
[3] The fund's investment adviser, BNY Mellon Investment Adviser, Inc., has contractually agreed to waive receipt of a portion of its management fee, in the amount of .05% of the value of the fund's average daily net assets until September 30, 2022. On or after September 30, 2022, BNY Mellon Investment Adviser, Inc. may terminate this waiver agreement at any time.