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Subsequent Events (CenterPoint Energy)
 9 Months Ended
Sep. 30, 2021
Subsequent Events [Abstract]  
Subsequent Events (CenterPoint Energy) Subsequent Events (CenterPoint Energy)
Enable Distributions Declarations (CenterPoint Energy)
Equity InstrumentDeclaration DateRecord DatePayment DatePer Unit DistributionExpected Cash Distribution
(in millions)
Enable common unitsOctober 26, 2021November 8, 2021November 17, 2021$0.16525 $39 
Enable Series A Preferred UnitsOctober 26, 2021October 26, 2021November 12, 20210.54030 8