XML 86 R61.htm IDEA: XBRL DOCUMENT v3.22.4

Derivative Financial Instruments (Details) bbl in Thousands, BTU in Billions		2 Months Ended
	Dec. 31, 2022 BTU $ / Barrels $ / EnergyContent bbl	Feb. 23, 2023 BTU $ / EnergyContent $ / Barrels bbl
NYMEX Oil Swap Contract First Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	294
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels	45.20
NYMEX Oil Swap Contract Second Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	333
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels	45.18
NYMEX Oil Swap Contract Third Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	304
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels	45.20
NYMEX Oil Swap Contract Fourth Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	259
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels	45.23
NYMEX Oil Swap Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	0
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels	0
NYMEX Oil Swap Contract, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	0
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels	0
ICE Brent Oil Swap Contract First Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	900
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels	86.50
ICE Brent Oil Swap Contract Second Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	910
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels	86.50
ICE Brent Oil Swap Contract Third Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	920
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels	86.50
ICE Brent Oil Swap Contract Fourth Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	920
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels	86.50
ICE Brent Oil Swap Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	910
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels	85.50
ICE Brent Oil Swap Contract, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	0
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels	0
NYMEX Oil Collar Contract First Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	577
Derivative, Weighted-Average Floor Price | $ / Barrels	60.00
Derivative, Weighted-Average Ceiling Price | $ / Barrels	74.02
NYMEX Oil Collar Contract Second Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	464
Derivative, Weighted-Average Floor Price | $ / Barrels	67.85
Derivative, Weighted-Average Ceiling Price | $ / Barrels	81.53
NYMEX Oil Collar Contract Third Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	291
Derivative, Weighted-Average Floor Price | $ / Barrels	75.00
Derivative, Weighted-Average Ceiling Price | $ / Barrels	93.05
NYMEX Oil Collar Contract Fourth Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	0
Derivative, Weighted-Average Floor Price | $ / Barrels	0
Derivative, Weighted-Average Ceiling Price | $ / Barrels	0
NYMEX Oil Collar Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	919
Derivative, Weighted-Average Floor Price | $ / Barrels	75.00
Derivative, Weighted-Average Ceiling Price | $ / Barrels	81.47
NYMEX Oil Collar Contract, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	0
Derivative, Weighted-Average Floor Price | $ / Barrels	0
Derivative, Weighted-Average Ceiling Price | $ / Barrels	0
NYMEX Oil Calendar Month Average Roll Differential Contract First Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	1,220
Derivative, Oil Roll Differential Swap, Weighted-Average Contract Price | $ / Barrels	0.60
NYMEX Oil Calendar Month Average Roll Differential Contract Second Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	1,243
Derivative, Oil Roll Differential Swap, Weighted-Average Contract Price | $ / Barrels	0.62
NYMEX Oil Calendar Month Average Roll Differential Contract Third Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	1,304
Derivative, Oil Roll Differential Swap, Weighted-Average Contract Price | $ / Barrels	0.64
NYMEX Oil Calendar Month Average Roll Differential Contract Fourth Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	1,201
Derivative, Oil Roll Differential Swap, Weighted-Average Contract Price | $ / Barrels	0.62
NYMEX Oil Calendar Month Average Roll Differential Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	0
Derivative, Oil Roll Differential Swap, Weighted-Average Contract Price | $ / Barrels	0
NYMEX Oil Calendar Month Average Roll Differential Contract, Year 2 | Subsequent Event
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		2,200
Derivative, Oil Roll Differential Swap, Weighted-Average Contract Price | $ / Barrels		0.42
NYMEX Oil Calendar Month Average Roll Differential Contract, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	0
Derivative, Oil Roll Differential Swap, Weighted-Average Contract Price | $ / Barrels	0
NYMEX Oil Swap Contract, Year 1 | Subsequent Event
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		600
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels		73.89
WTI Midland NYMEX WTI | Oil Basis Swap Contract First Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	1,294
Derivative, Oil Basis Swap, Weighted-Average Contract Price | $ / Barrels	0.99
WTI Midland NYMEX WTI | Oil Basis Swap Contract Second Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	1,357
Derivative, Oil Basis Swap, Weighted-Average Contract Price | $ / Barrels	0.99
WTI Midland NYMEX WTI | Oil Basis Swap Contract Third Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	1,414
Derivative, Oil Basis Swap, Weighted-Average Contract Price | $ / Barrels	0.88
WTI Midland NYMEX WTI | Oil Basis Swap Contract Fourth Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	1,294
Derivative, Oil Basis Swap, Weighted-Average Contract Price | $ / Barrels	0.88
WTI Midland NYMEX WTI | Oil Basis Swap Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	893
Derivative, Oil Basis Swap, Weighted-Average Contract Price | $ / Barrels	1.10
WTI Midland NYMEX WTI | Oil Basis Swap Contract, Year 2 | Subsequent Event
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		2,100
Derivative, Oil Basis Swap, Weighted-Average Contract Price | $ / Barrels		1.20
WTI Midland NYMEX WTI | Oil Basis Swap Contract, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	0
Derivative, Oil Basis Swap, Weighted-Average Contract Price | $ / Barrels	0
WTI Houston MEH NYMEX WTI | Oil Basis Swap Contract First Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	390
Derivative, Oil Basis Swap, Weighted-Average Contract Price | $ / Barrels	1.65
WTI Houston MEH NYMEX WTI | Oil Basis Swap Contract Second Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	431
Derivative, Oil Basis Swap, Weighted-Average Contract Price | $ / Barrels	1.68
WTI Houston MEH NYMEX WTI | Oil Basis Swap Contract Third Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	361
Derivative, Oil Basis Swap, Weighted-Average Contract Price | $ / Barrels	1.59
WTI Houston MEH NYMEX WTI | Oil Basis Swap Contract Fourth Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	296
Derivative, Oil Basis Swap, Weighted-Average Contract Price | $ / Barrels	1.53
WTI Houston MEH NYMEX WTI | Oil Basis Swap Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	297
Derivative, Oil Basis Swap, Weighted-Average Contract Price | $ / Barrels	1.75
WTI Houston MEH NYMEX WTI | Oil Basis Swap Contract, Year 2 | Subsequent Event
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		600
Derivative, Oil Basis Swap, Weighted-Average Contract Price | $ / Barrels		1.90
WTI Houston MEH NYMEX WTI | Oil Basis Swap Contract, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl	0
Derivative, Oil Basis Swap, Weighted-Average Contract Price | $ / Barrels	0
NYMEX HH | Gas Swaps Contract First Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	0
Derivative, Swap Type, Weighted-Average Contract Price	0
NYMEX HH | Gas Swaps Contract Second Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	1,420
Derivative, Swap Type, Weighted-Average Contract Price	5.05
NYMEX HH | Gas Swaps Contract Third Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	1,470
Derivative, Swap Type, Weighted-Average Contract Price	5.11
NYMEX HH | Gas Swaps Contract Fourth Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	0
Derivative, Swap Type, Weighted-Average Contract Price	0
NYMEX HH | Gas Swaps Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	0
Derivative, Swap Type, Weighted-Average Contract Price	0
NYMEX HH | Gas Swaps Contract, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	0
Derivative, Swap Type, Weighted-Average Contract Price	0
NYMEX HH | Gas Collar Contract, First Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	7,919
Derivative, Weighted-Average Floor Price	3.84
Derivative, Weighted-Average Ceiling Price	9.75
NYMEX HH | Gas Collar Contract, Second Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	5,181
Derivative, Weighted-Average Floor Price	3.83
Derivative, Weighted-Average Ceiling Price	4.68
NYMEX HH | Gas Collar Contract, Third Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	6,194
Derivative, Weighted-Average Floor Price	3.75
Derivative, Weighted-Average Ceiling Price	4.62
NYMEX HH | Gas Collar Contract, Fourth Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	8,362
Derivative, Weighted-Average Floor Price	3.90
Derivative, Weighted-Average Ceiling Price	5.70
NYMEX HH | Gas Collar Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	13,722
Derivative, Weighted-Average Floor Price	4.00
Derivative, Weighted-Average Ceiling Price	6.39
NYMEX HH | Gas Collar Contract, Year 2 | Subsequent Event
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU		5,735
Derivative, Weighted-Average Floor Price		3.00
Derivative, Weighted-Average Ceiling Price		4.70
NYMEX HH | Gas Collar Contract, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	0
Derivative, Weighted-Average Floor Price	0
Derivative, Weighted-Average Ceiling Price	0
IF WAHA | Gas Swaps Contract First Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	900
Derivative, Swap Type, Weighted-Average Contract Price	3.98
IF WAHA | Gas Swaps Contract Second Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	0
Derivative, Swap Type, Weighted-Average Contract Price	0
IF WAHA | Gas Swaps Contract Third Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	0
Derivative, Swap Type, Weighted-Average Contract Price	0
IF WAHA | Gas Swaps Contract Fourth Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	0
Derivative, Swap Type, Weighted-Average Contract Price	0
IF WAHA | Gas Swaps Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	0
Derivative, Swap Type, Weighted-Average Contract Price	0
IF WAHA | Gas Swaps Contract, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	0
Derivative, Swap Type, Weighted-Average Contract Price	0
IF HSC | Gas Collar Contract, First Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	900
Derivative, Weighted-Average Floor Price	3.38
Derivative, Weighted-Average Ceiling Price	7.75
IF HSC | Gas Collar Contract, Second Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	1,345
Derivative, Weighted-Average Floor Price	4.25
Derivative, Weighted-Average Ceiling Price	5.00
IF HSC | Gas Collar Contract, Third Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	1,389
Derivative, Weighted-Average Floor Price	4.25
Derivative, Weighted-Average Ceiling Price	4.95
IF HSC | Gas Collar Contract, Fourth Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	1,451
Derivative, Weighted-Average Floor Price	4.25
Derivative, Weighted-Average Ceiling Price	5.55
IF HSC | Gas Collar Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	0
Derivative, Weighted-Average Floor Price	0
Derivative, Weighted-Average Ceiling Price	0
IF HSC | Gas Collar Contract, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	0
Derivative, Weighted-Average Floor Price	0
Derivative, Weighted-Average Ceiling Price	0
IF WAHA NYMEX HH | Gas Basis Swap Contract, First Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	1,816
Derivative, Gas Basis Swap Type, Weighted-Average Contract Price	(0.81)
IF WAHA NYMEX HH | Gas Basis Swap Contract, Second Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	2,462
Derivative, Gas Basis Swap Type, Weighted-Average Contract Price	(1.93)
IF WAHA NYMEX HH | Gas Basis Swap Contract, Third Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	2,442
Derivative, Gas Basis Swap Type, Weighted-Average Contract Price	(1.05)
IF WAHA NYMEX HH | Gas Basis Swap Contract, Fourth Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	2,337
Derivative, Gas Basis Swap Type, Weighted-Average Contract Price	(1.01)
IF WAHA NYMEX HH | Gas Basis Swap Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	20,958
Derivative, Gas Basis Swap Type, Weighted-Average Contract Price	(0.86)
IF WAHA NYMEX HH | Gas Basis Swap Contract, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	20,501
Derivative, Gas Basis Swap Type, Weighted-Average Contract Price	(0.66)
IF HSC NYMEX HH | Gas Basis Swap Contract, First Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	6,737
Derivative, Gas Basis Swap Type, Weighted-Average Contract Price	0.19
IF HSC NYMEX HH | Gas Basis Swap Contract, Second Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	1,774
Derivative, Gas Basis Swap Type, Weighted-Average Contract Price	(0.25)
IF HSC NYMEX HH | Gas Basis Swap Contract, Third Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	1,813
Derivative, Gas Basis Swap Type, Weighted-Average Contract Price	(0.25)
IF HSC NYMEX HH | Gas Basis Swap Contract, Fourth Quarter, Year 1
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	2,008
Derivative, Gas Basis Swap Type, Weighted-Average Contract Price	(0.25)
IF HSC NYMEX HH | Gas Basis Swap Contract, Year 2
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	0
Derivative, Gas Basis Swap Type, Weighted-Average Contract Price	0
IF HSC NYMEX HH | Gas Basis Swap Contract, Year 3
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	0
Derivative, Gas Basis Swap Type, Weighted-Average Contract Price	0
OPIS Propane Mont Belvieu Non-TET | NGL Swaps Contract, Year 1 | Subsequent Event
Derivative Financial Instruments
Derivative, Nonmonetary Notional Amount, Volume | bbl		400
Derivative, Swap Type, Weighted-Average Contract Price | $ / Barrels		36.12

X

- Definition

Derivative, Calendar Month Average Roll Differential Swap Type, Weighted-Average Contract Price

+ References

No definition available.

+ Details

Name:	sm_DerivativeCalendarMonthAverageRollDifferentialSwapTypeWeightedAverageContractPrice
Namespace Prefix:	sm_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Derivative, Gas Basis Swap Type, Weighted-Average Contract Price

+ References

No definition available.

+ Details

Name:	sm_DerivativeGasBasisSwapTypeWeightedAverageContractPrice
Namespace Prefix:	sm_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Derivative, Oil Basis Swap Type, Weighted-Average Contract Price

+ References

No definition available.

+ Details

Name:	sm_DerivativeOilBasisSwapTypeWeightedAverageContractPrice
Namespace Prefix:	sm_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeCapPrice
Namespace Prefix:	us-gaap_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Floor rate on a price risk derivative such as a floor or a collar. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFloorPrice
Namespace Prefix:	us-gaap_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Nominal energy measure used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:energyItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeNonmonetaryNotionalAmountVolume
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:volumeItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Average fixed price related to the group of price risk swap derivatives.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeSwapTypeAverageFixedPrice
Namespace Prefix:	us-gaap_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_NYMEXOilSwapContractFirstQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_NYMEXOilSwapContractSecondQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_NYMEXOilSwapContractThirdQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_NYMEXOilSwapContractFourthQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_NYMEXOilSwapContractYear2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_NYMEXOilSwapContractYear3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_ICEBrentOilSwapContractFirstQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_ICEBrentOilSwapContractSecondQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_ICEBrentOilSwapContractThirdQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_ICEBrentOilSwapContractFourthQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_ICEBrentOilSwapContractYear2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_ICEBrentOilSwapContractYear3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_NYMEXOilCollarContractFirstQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_NYMEXOilCollarContractSecondQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_NYMEXOilCollarContractThirdQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_NYMEXOilCollarContractFourthQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_NYMEXOilCollarContractYear2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_NYMEXOilCollarContractYear3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_NYMEXOilCalendarMonthAverageRollDifferentialContractFirstQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_NYMEXOilCalendarMonthAverageRollDifferentialContractSecondQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_NYMEXOilCalendarMonthAverageRollDifferentialContractThirdQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_NYMEXOilCalendarMonthAverageRollDifferentialContractFourthQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_NYMEXOilCalendarMonthAverageRollDifferentialContractYear2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_NYMEXOilCalendarMonthAverageRollDifferentialContractYear3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_NYMEXOilSwapContractYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	sm_DerivativeUnderlyingIndexAxis=sm_WTIMidlandNYMEXWTIMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_OilBasisSwapContractFirstQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_OilBasisSwapContractSecondQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_OilBasisSwapContractThirdQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_OilBasisSwapContractFourthQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_OilBasisSwapContractYear2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_OilBasisSwapContractYear3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	sm_DerivativeUnderlyingIndexAxis=sm_WTIHoustonMEHNYMEXWTIMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	sm_DerivativeUnderlyingIndexAxis=sm_NYMEXHHMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_GasSwapsContractFirstQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_GasSwapsContractSecondQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_GasSwapsContractThirdQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_GasSwapsContractFourthQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_GasSwapsContractYear2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_GasSwapsContractYear3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_GasCollarContractFirstQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_GasCollarContractSecondQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_GasCollarContractThirdQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_GasCollarContractFourthQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_GasCollarContractYear2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_GasCollarContractYear3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	sm_DerivativeUnderlyingIndexAxis=sm_IFWAHAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	sm_DerivativeUnderlyingIndexAxis=sm_IfHscMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	sm_DerivativeUnderlyingIndexAxis=sm_IFWAHANYMEXHHMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_GasBasisSwapContractFirstQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_GasBasisSwapContractSecondQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_GasBasisSwapContractThirdQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_GasBasisSwapContractFourthQuarterYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_GasBasisSwapContractYear2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_GasBasisSwapContractYear3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	sm_DerivativeUnderlyingIndexAxis=sm_IFHSCNYMEXHHMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	sm_DerivativeUnderlyingIndexAxis=sm_OPISPropaneMontBelvieuNonTETMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sm_NGLSwapsContractYear1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: