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Derivative Financial Instruments Credit Facility (Details)	Dec. 31, 2022
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Percentage of proved property secured for credit facility borrowing	85.00%

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- Definition

Percentage of Proved Property Secured for Credit Facility Borrowing

+ References

No definition available.

+ Details

Name:	sm_PercentageofProvedPropertySecuredforCreditFacilityBorrowing
Namespace Prefix:	sm_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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