Acquisitions - Identifiable Assets Acquired and Liabilities (Details) - USD ($)	Oct. 01, 2021	Dec. 31, 2021	Dec. 31, 2020
Significant Acquisitions and Disposals
Common stock, issued (in shares)		892,612,010	477,828,813
Total Cimarex common stock to be converted	100,000,000
Liabilities and Mezzanine Equity assumed:
Other current liabilities	$ 83,000,000
Cimarex redeemable preferred stock	50,000,000
Cimarex
Significant Acquisitions and Disposals
Total consideration	9,120,000,000
Assets acquired:
Cash and cash equivalents	1,033,000,000
Accounts receivable, net	598,000,000
Other current assets	31,000,000
Properties and equipment	13,300,000,000
Other assets	324,000,000
Total assets acquired	15,286,000,000
Liabilities and Mezzanine Equity assumed:
Accounts payable	528,000,000
Accrued liabilities	258,000,000
Derivative instruments, current	382,000,000
Long-term debt, net	2,196,000,000
Deferred income taxes	2,201,000,000	$ 2,200,000,000
Asset retirement obligation	162,000,000
Derivative instruments, noncurrent	7,000,000
Other liabilities	299,000,000
Cimarex redeemable preferred stock	50,000,000
Total liabilities and mezzanine equity assumed	6,166,000,000
Net assets acquired	9,120,000,000
Cimarex | Stock Options
Significant Acquisitions and Disposals
Value of shares issued	15,000,000
Cimarex | Restricted Stock Awards
Significant Acquisitions and Disposals
Value of shares issued	$ 22,000,000
Cimarex | Common Shares
Significant Acquisitions and Disposals
Exchange ratio (in shares)	4.0146
Coterra common stock closing price (in dollars per share)	408,000,000
Coterra common stock issued in exchange for Cimarex common stock (in shares)	403,000,000
Coterra common stock issued for Cimarex share awards vested on October 1, 2021 (in shares)	5,000,000
Coterra common stock closing price on October 1, 2021	$ 22.25
Value of shares issued	$ 9,083,000,000
Cimarex | Cimarex
Significant Acquisitions and Disposals
Common stock, issued (in shares)	103,000,000
Less unvested common stock	(3,000,000)