| Cover Page | Nov. 03, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Nov. 3, 2021 |
| Entity Registrant Name | COTERRA ENERGY INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 1-10447 |
| Entity Tax Identification Number | 04-3072771 |
| Entity Address, Address Line One | Three Memorial City Plaza |
| Entity Address, Address Line Two | 840 Gessner Road, Suite 1400 |
| Entity Address, City or Town | Houston |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 77024 |
| City Area Code | 281 |
| Local Phone Number | 589-4600 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Central Index Key | 0000858470 |
| Title of 12(b) Security | Common Stock, par value $0.10 per share |
| Trading Symbol | CTRA |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
