STATEMENTS OF CONSOLIDATED CHANGES IN EQUITY - CERC - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in-Capital	Retained Earnings (Accumulated Deficit)	Retained Earnings (Accumulated Deficit) Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss	CERC Corp	CERC Corp Common Stock	CERC Corp Additional Paid-in-Capital	CERC Corp Additional Paid-in-Capital Discontinued Operations	CERC Corp Retained Earnings (Accumulated Deficit)	CERC Corp Retained Earnings (Accumulated Deficit) Cumulative Effect, Period of Adoption, Adjustment	CERC Corp Accumulated Other Comprehensive Loss
Balance, beginning of year (in shares) at Dec. 31, 2019		502,000,000						1,000
Balance, end of year (in shares) at Dec. 31, 2020		551,000,000						1,000
Balance, beginning of year at Dec. 31, 2019		$ 5	$ 6,080	$ 632	$ (7)	$ (98)		$ 0	$ 3,915		$ 578	$ (5)	$ 10
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash contribution from parent									337
Capital distribution to parent associated with the sale of CES							$ 0			$ (286)
Net income (loss)	$ (773)			(773)			199				199
Dividend to parent											(128)
Other comprehensive income						8							0
Balance, end of year at Dec. 31, 2020	$ 8,348	$ 6	6,914	(845)		(90)	4,620	$ 0	3,966		644		10
Balance, end of year (in shares) at Dec. 31, 2021	628,923,534	629,000,000						1,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash contribution from parent									140
Capital distribution to parent associated with the sale of CES							0			0
Net income (loss)	$ 1,486			1,486			390				390
Dividend to parent											(17)
Other comprehensive income						26							0
Balance, end of year at Dec. 31, 2021	$ 9,415	$ 6	8,529	154		(64)	5,133	$ 0	4,106		1,017		10
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)
Capital distribution to parent associated with the sale of CES							(720)			$ 0
Net income (loss)	$ 1,057			1,057			725				725
Dividend to parent											(124)
Other comprehensive income						33							6
Balance, end of year at Dec. 31, 2022	$ 10,042	$ 6	$ 8,568	$ 709		$ (31)	$ 5,363	$ 0	$ 3,729		$ 1,618		$ 16