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Long-Term Debt (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Senior Notes $ 2,200,000,000us-gaap_SeniorNotes $ 2,200,000,000us-gaap_SeniorNotes
Document Period End Date Mar. 31, 2015  
Revolving Credit Facility [Member] | Line of Credit [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 2,500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
 
Line of Credit Facility, Current Borrowing Capacity 1,500,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
 
Percentage of Proved Property Secured for Credit Facility Borrowing 75.00%sm_PercentageofProvedPropertySecuredforCreditFacilityBorrowing
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
 
Line of Credit, Covenant Compliance, Maximum Annual Dividend Payment 50,000,000sm_LineOfCreditCovenantComplianceMaximumAnnualDividendPayment
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
 
Senior Notes [Member]    
Debt Instrument [Line Items]    
6.625% Senior Notes, Due 2019 350,000,000sm_A6.625SeniorNotesDue2019FaceValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
350,000,000sm_A6.625SeniorNotesDue2019FaceValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
6.50% Senior Notes, Due 2021 350,000,000sm_A6.50SeniorNotesDue2021FaceValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
350,000,000sm_A6.50SeniorNotesDue2021FaceValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
6.125% Senior Notes, Due 2022 600,000,000sm_A6.125SeniorNotesDue2022
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
600,000,000sm_A6.125SeniorNotesDue2022
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
6.50% Senior Notes, Due 2023 400,000,000sm_A6.50SeniorNotesDue2023FaceValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
400,000,000sm_A6.50SeniorNotesDue2023FaceValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
5% Senior Notes, Due 2024 500,000,000sm_A5SeniorNotesDue2024FaceValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
500,000,000sm_A5SeniorNotesDue2024FaceValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Senior Notes 2,200,000,000us-gaap_SeniorNotes
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
2,200,000,000us-gaap_SeniorNotes
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Debt Instrument, Covenant Compliance, Dividends Excluded From Computation $ 6,500,000sm_DebtInstrumentCovenantComplianceDividendsExcludedFromComputation
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
 
Senior Notes [Member] | 6.625% Senior Notes Due 2019 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 6.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sm_A6625SeniorNotesDue2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
 
Senior Notes [Member] | 6.50% Senior Notes Due 2021 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sm_A650SeniorNotesDue2021Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
 
Senior Notes [Member] | 6.125% Senior Notes Due 2022 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 6.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sm_A6.125SeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
 
Senior Notes [Member] | 6.50% Senior Notes Due 2023 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sm_A650SeniorNotesDue2023Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
 
Senior Notes [Member] | 5% Senior Notes Due 2024 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sm_A5SeniorNotesDue2024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember