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OTHER - Narrative (Details) - derivative_instrument	Mar. 31, 2021	Mar. 31, 2020
Other Income and Expenses [Abstract]
Number of foreign currency option outstanding	0	0
Number of foreign forward contracts outstanding	0	0

X

- Definition

Number of foreign currency option outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	shw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of foreign forward contracts outstanding.

+ References

No definition available.

+ Details

Name:	shw_NumberOfForeignForwardContractsOutstanding
Namespace Prefix:	shw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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