STATEMENTS OF CONSOLIDATED CHANGES IN EQUITY - CERC - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in-Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Loss	CERC Corp	CERC Corp Common Stock	CERC Corp Additional Paid-in-Capital	CERC Corp Retained Earnings (Accumulated Deficit)	CERC Corp Accumulated Other Comprehensive Loss
Balance, beginning of year (in shares) at Dec. 31, 2020		551,000,000					1,000
Balance, end of year (in shares) at Dec. 31, 2021		629,000,000					1,000
Balance, beginning of year at Dec. 31, 2020		$ 6	$ 6,914	$ (845)	$ (90)		$ 0	$ 3,966	$ 644	$ 10
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contribution from parent								0
Cash contribution from parent								140
Contribution to parent for sale of Arkansas and Oklahoma Natural Gas businesses								0
Net income (loss)	$ 1,486			1,486		$ 390			390
Dividend to parent									(17)
Balance, end of year at Dec. 31, 2021	9,415	$ 6	8,529	154	(64)	5,133	$ 0	4,106	1,017	10
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net current period other comprehensive income (loss)	$ 26				26	0				0
Balance, end of year (in shares) at Dec. 31, 2022	629,535,631	630,000,000					1,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contribution from parent								54
Cash contribution from parent								289
Contribution to parent for sale of Arkansas and Oklahoma Natural Gas businesses								(720)
Net income (loss)	$ 1,057			1,057		725			725
Dividend to parent									(124)
Balance, end of year at Dec. 31, 2022	10,042	$ 6	8,568	709	(31)	5,363	$ 0	3,729	1,618	16
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net current period other comprehensive income (loss)	$ 33				33	6				6
Balance, end of year (in shares) at Dec. 31, 2023	631,225,829	631,000,000					1,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contribution from parent								0
Cash contribution from parent								500
Contribution to parent for sale of Arkansas and Oklahoma Natural Gas businesses								0
Net income (loss)	$ 917			917		512			512
Dividend to parent									(496)
Balance, end of year at Dec. 31, 2023	9,667	$ 6	$ 8,604	$ 1,092	(35)	5,879	$ 0	$ 4,229	$ 1,634	16
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net current period other comprehensive income (loss)	$ (4)				$ (4)	$ 0				$ 0