Concentrations of Credit Risk (Details) - USD ($)	6 Months Ended
Jun. 30, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Receivables from Erie Insurance Exchange and its affiliates	$ 506,690,000	$ 468,636,000
Erie Insurance Exchange
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Change in allowance for credit loss	$ 0

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant