Earnings per Common Share - Schedule of EPS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income (Numerator)
Net income	$ 608	$ 126
Less: dividends attributable to participating securities	(2)	0
Less: Cimarex redeemable preferred stock dividends	(1)	0
Net income available to common stockholders	$ 605	$ 126
Shares (Denominator)
Weighted-average shares - basic (in shares)	810	399
Dilution effect of stock awards at end of period (in shares)	4	3
Weighted-average shares - diluted (in shares)	814	402
Earnings per share:
Basic (in dollars per share)	$ 0.75	$ 0.32
Diluted (in dollars per share)	$ 0.74	$ 0.31