Risk/Return Summary - FidelityMegaCapStockFund-RetailPRO - FidelityMegaCapStockFund-RetailPRO - Fidelity Mega Cap Stock Fund	Aug. 29, 2024
Risk Lose Money [Text]
Prospectus Line Items
Risk Text Block	You could lose money by investing in the fund.
Risk Not Insured Depository Institution [Text]
Prospectus Line Items
Risk Text Block	An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency .

Text block containing a risk heading and narrative for a single risk.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 4
-Subsection b
-Paragraph 1
-Subparagraph i
-Clause instruction

Name:	rr_RiskTextBlock
Namespace Prefix:	rr_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration