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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 1, 2022

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

Supplement to Current Summary Prospectus and Prospectus

Effective on or about December 1, 2022 (the "Effective Date"), the following information supersedes and replaces any contrary information in the sections "Fees and Expenses" in the fund's summary prospectus and "Fund Summary – Fees and Expenses" in the fund's prospectus:
Risk/Return [Heading] rr_RiskReturnHeading BNY MELLON CALIFORNIA AMT-FREE MUNICIPAL BOND FUND, INC.
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)
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Restated to reflect management fees as of the Effective Date.
Expense Example [Heading] rr_ExpenseExampleHeading Example
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 0.45% [2]
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder services fees rr_Component1OtherExpensesOverAssets 0.25%
Miscellaneous other expenses rr_Component2OtherExpensesOverAssets 0.10% [3]
Total other expenses rr_OtherExpensesOverAssets 0.35%
Total annual fund operating expenses rr_ExpensesOverAssets 0.80%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Class A shares bought without an initial sales charge as part of an investment of $250,000 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 $ 528
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 694
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 874
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,395
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 528
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 694
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 874
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,395
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 0.45% [2]
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.75%
Shareholder services fees rr_Component1OtherExpensesOverAssets 0.25%
Miscellaneous other expenses rr_Component2OtherExpensesOverAssets 0.12% [3]
Total other expenses rr_OtherExpensesOverAssets 0.37%
Total annual fund operating expenses rr_ExpensesOverAssets 1.57%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 260
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 496
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 855
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,867
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 160
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 496
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 855
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,867
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 0.45% [2]
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder services fees rr_Component1OtherExpensesOverAssets none
Miscellaneous other expenses rr_Component2OtherExpensesOverAssets 0.12% [3]
Total other expenses rr_OtherExpensesOverAssets 0.12%
Total annual fund operating expenses rr_ExpensesOverAssets 0.57%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 58
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 183
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 318
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 714
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 58
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 183
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 318
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 714
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 0.45% [2]
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder services fees rr_Component1OtherExpensesOverAssets none
Miscellaneous other expenses rr_Component2OtherExpensesOverAssets 0.12% [3]
Total other expenses rr_OtherExpensesOverAssets 0.12%
Total annual fund operating expenses rr_ExpensesOverAssets 0.57%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 58
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 183
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 318
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 714
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 58
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 183
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 318
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 714
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 0.45% [2]
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder services fees rr_Component1OtherExpensesOverAssets 0.04%
Miscellaneous other expenses rr_Component2OtherExpensesOverAssets 0.10% [3]
Total other expenses rr_OtherExpensesOverAssets 0.14%
Total annual fund operating expenses rr_ExpensesOverAssets 0.59%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 60
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 189
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 329
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 738
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 60
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 189
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 329
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 738
[1] Class A shares bought without an initial sales charge as part of an investment of $250,000 or more may be charged a deferred sales charge of 1.00% if redeemed within one year.
[2] Restated to reflect management fees as of the Effective Date.
[3] Includes interest expense in the amount of .03% in connection with inverse floater securities.