Earnings Per Share (CenterPoint Energy) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Recognition of beneficial conversion feature	$ 0	$ 0	$ 32
Numerator:
Income From Continuing Operations Before Income Taxes	1,057	668	483
Less: Preferred stock dividend requirement	49	95	176
Less: Amortization of beneficial conversion feature	0	0	32
Income (loss) available to common shareholders from continuing operations - basic	1,008	573	307
Income (loss) available to common shareholders from continuing operations - diluted	1,008	573	307
Income (loss) available to common shareholders from discontinued operations - basic	0	818	(1,256)
Income (loss) available to common shareholders from discontinued operations - diluted	0	818	(1,256)
Net income attributable to Enable Common Units	1,008	1,391	(949)
Income (loss) available to common shareholders - diluted	$ 1,008	$ 1,391	$ (949)
Denominator:
Weighted average common shares outstanding - basic	629,415	592,933	531,031
Weighted average common shares outstanding - diluted	632,346	609,938	531,031
Earnings (loss) per common share:
Basic earnings per common share - continuing operations (in dollars per share)	$ 1.60	$ 0.97	$ 0.58
Basic earnings (loss) per common share - discontinued operations (in dollars per share)	0	1.38	(2.37)
Basic Earnings (Loss) Per Common Share (in dollars per share)	1.60	2.35	(1.79)
Basic Earnings (Loss) Per Common Share
Diluted earnings per common share - continuing operations (in dollars per share)	1.59	0.94	0.58
Diluted earnings (loss) per common share - discontinued operations (in dollars per share)	0	1.34	(2.37)
Diluted Earnings (Loss) Per Common Share (in dollars per share)	$ 1.59	$ 2.28	$ (1.79)
Restricted stock
Denominator:
Restricted stock	2,931	5,181	0
Anti-dilutive Incremental Shares Excluded from Denominator for Diluted Earnings (Loss) Computation:
Amount of antidilutive securities excluded from computation of earnings per share	0	0	3,690
Series B Preferred Stock
Numerator:
Less: Preferred stock dividend requirement	$ 49	$ 95	$ 144
Anti-dilutive Incremental Shares Excluded from Denominator for Diluted Earnings (Loss) Computation:
Amount of antidilutive securities excluded from computation of earnings per share	0	23,906	35,922
Series C Preferred Stock
Denominator:
Preferred Stock	0	11,824	0
Anti-dilutive Incremental Shares Excluded from Denominator for Diluted Earnings (Loss) Computation:
Amount of antidilutive securities excluded from computation of earnings per share	0	0	23,807