Cover
Jul. 08, 2021
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jul. 08, 2021
Entity File Number 001-31539
Entity Registrant Name SM Energy Company
Entity Central Index Key 0000893538
Entity Tax Identification Number 41-0518430
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 1775 Sherman Street
Entity Address, Address Line Two Suite 1200
Entity Address, City or Town Denver
Entity Address, State or Province CO
Entity Address, Postal Zip Code 80203
City Area Code 303
Local Phone Number 861-8140
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common stock, $0.01 par value
Trading Symbol SM
Security Exchange Name NYSE
Entity Emerging Growth Company false