Cover Page - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2020	Feb. 22, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2020
Entity File Number	1-10447
Entity Registrant Name	CABOT OIL & GAS CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	04-3072771
Entity Address, Address Line One	Three Memorial City Plaza
Entity Address, Address Line Two	840 Gessner Road
Entity Address, Address Line Three	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
Title of 12(b) Security	Common Stock, par value $0.10 per share
Trading Symbol	COG
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 6.7
Entity Common Stock, Shares Outstanding		399,419,748
Entity Central Index Key	0000858470
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	false
Documents Incorporated by Reference	Portions of the Proxy Statement for the Annual Meeting of Stockholders to be held April 29, 2021 are incorporated by reference into Part III of this report.