Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) - Schedule of Sale of Equity Securities (CenterPoint Energy) (Details) - Energy Transfer Common Units - USD ($) $ in Millions	1 Months Ended	2 Months Ended
	Mar. 31, 2022	Mar. 31, 2022
Debt and Equity Securities, FV-NI [Line Items]
Units sold (in shares)		50,999,768
Proceeds from sale of units		$ 515
Energy Transfer Series G Preferred Units
Debt and Equity Securities, FV-NI [Line Items]
Units sold (in shares)	192,390
Proceeds from sale of units	$ 187