Equity Securities and Indexed Debt Securities (ZENS) (CenterPoint Energy) - Schedule of Sale of Equity Securities (Details) - Energy Transfer Common Units - USD ($) $ in Millions	Dec. 13, 2021	Dec. 10, 2021	Dec. 08, 2021
Debt and Equity Securities, FV-NI [Line Items]
Units sold (in shares)		100,000,000	50,000,000
Proceeds from sale of units		$ 745	$ 384
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	$ 191