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Label Element Value
Prospectus: rr_ProspectusTable  
Document Type dei_DocumentType 497
Document Period End Date dei_DocumentPeriodEndDate Jul. 29, 2016
Entity Registrant Name dei_EntityRegistrantName AMERICAN CENTURY MUTUAL FUNDS, INC.
Central Index Key dei_EntityCentralIndexKey 0000100334
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Jul. 29, 2016
Document Effective Date dei_DocumentEffectiveDate Mar. 01, 2016
Prospectus Date rr_ProspectusDate Mar. 01, 2016
Supplement [Text Block] ck000077367_SupplementTextBlock
American Century Mutual Funds, Inc.
Summary Prospectus and Prospectus Supplement
Veedot® Fund
Supplement dated August 1, 2016 n Summary Prospectus dated March 1, 2016 (as revised March 21, 2016) and Prospectus dated March 1, 2016
VEEDOT FUND  
Prospectus: rr_ProspectusTable  
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The following replaces the tables in the Fees and Expenses section on page 1 of the summary prospectus and page 2 of the prospectus:
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination July 31, 2017
VEEDOT FUND | INVESTOR CLASS  
Prospectus: rr_ProspectusTable  
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Maximum Account Fee rr_MaximumAccountFee $ 25
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.25%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.26%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.10%) [1]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.16%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 118
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 390
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 683
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,513
VEEDOT FUND | INSTITUTIONAL CLASS  
Prospectus: rr_ProspectusTable  
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Maximum Account Fee rr_MaximumAccountFee none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.05%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.06%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.10%) [1]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.96%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 98
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 328
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 576
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,285
[1] Effective August 1, 2016, the advisor has agreed to waive 0.10 percentage points of the fund’s management fee. The advisor expects this waiver to continue until July 31, 2017 and cannot terminate it prior to such date without the approval of the Board of Directors.