Earnings per Common Share - Schedule of EPS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Income (Numerator)
Net income	$ 209	$ 677	$ 1,229	$ 608	$ 886	$ 1,837
Less: dividends attributable to participating securities	(1)		(1)		(3)	(3)
Less: Cimarex redeemable preferred stock dividends	0		0		0	(1)
Net income available to common stockholders	$ 208		$ 1,228		$ 883	$ 1,833
Shares (Denominator)
Weighted-average shares - basic (in shares)	755		803		760	806
Dilution effect of stock awards at end of period (in shares)	5		5		4	3
Weighted-average shares - diluted (in shares)	760		808		764	809
Earnings per share:
Basic (in dollars per share)	$ 0.28		$ 1.53		$ 1.16	$ 2.28
Diluted (in dollars per share)	$ 0.27		$ 1.52		$ 1.16	$ 2.27