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Accounts Receivable Sales Agreement (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Receivables [Abstract] |  |  |
Sale agreement term | 1 year |  |
Sale agreement amount | $ 1,000 |  |
Principal amount outstanding of receivables sold at period end | 1,000 |  | $ 1,000
Amount held as collateral | 1,600 |  | $ 1,300
Accounts receivable sales transactions fees | $ 39 | $ 47 |

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- Definition Accounts Receivable, Sale Agreement Amount + References No definition available. + Details
Name: | gpc_AccountsReceivableSaleAgreementAmount
Namespace Prefix: | gpc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Accounts Receivable, Sale Agreement Term + References No definition available. + Details
Name: | gpc_AccountsReceivableSaleAgreementTerm
Namespace Prefix: | gpc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Accounts Receivable, Sales Transactions Fees + References No definition available. + Details
Name: | gpc_AccountsReceivableSalesTransactionsFees
Namespace Prefix: | gpc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Transfer of Financial Assets Accounted for as Sales, Pledged Receivable + References No definition available. + Details
Name: | gpc_TransferOfFinancialAssetsAccountedForAsSalesPledgedReceivable
Namespace Prefix: | gpc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Proceeds from securitizations of receivables treated as collateralized borrowings, which are classified as financing transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration