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Revenue (Narrative) (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Revenue [Abstract]
Contract assets, contract liabilities, or deferred contract costs recorded

X

- Definition

Contract with Customer, Net Asset (Liability)

+ References

No definition available.

+ Details

Name:	graybar_ContractWithCustomerNetAssetLiability
Namespace Prefix:	graybar_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration