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Commitments and Contingencies - Narrative (Details) $ in Millions			12 Months Ended
	Feb. 10, 2023 USD ($)	Oct. 27, 2021	Dec. 31, 2022 USD ($) gasManufacturingAndStorageSite ashPond lawsuit day surety_bond warranty_obligation	Jul. 05, 2022 MW	Jan. 31, 2022 MW	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Purchase Obligations
Number of surety bond obligations outstanding | surety_bond			66
Performance guarantee obligations outstanding face amount			$ 646
Percentage of work yet to be completed on projects with open surety bonds			37.00%
Number of warranty obligations outstanding | warranty_obligation			34
Warranty obligations outstanding face amount			$ 521
Energy savings commitments not guaranteed			1,400
Maximum exposure amount			$ 527
Number of coal ash ponds owned | ashPond			3
Asset retirement obligation			$ 610			$ 659	$ 664
Subsequent Event
Purchase Obligations
Estimated project costs	$ 50
F.B. Culley
Purchase Obligations
Number of coal ash ponds owned | ashPond			2
A.B. Brown
Purchase Obligations
Number of coal ash ponds owned | ashPond			1
F.B. Culley East
Purchase Obligations
Number of coal ash ponds owned | ashPond			1
Indiana Gas Service Territory
Purchase Obligations
Environmental remediation number of sites with potential remedial responsibility | gasManufacturingAndStorageSite			26
SIGECO
Purchase Obligations
Environmental remediation number of sites with potential remedial responsibility | gasManufacturingAndStorageSite			5
February 2021 Winter Storm Event | Loss from Catastrophes
Purchase Obligations
Number of pending lawsuits | lawsuit			250
CERC Corp
Purchase Obligations
Asset retirement obligation			$ 420			479	514
Houston Electric
Purchase Obligations
Asset retirement obligation			36			$ 42	$ 43
Indiana Electric
Purchase Obligations
Asset retirement obligation			104
Indiana Electric | Minimum
Purchase Obligations
Estimated capital expenditure to clean ash ponds			60
Indiana Electric | Maximum
Purchase Obligations
Estimated capital expenditure to clean ash ponds			$ 80
CenterPoint Energy, Utility Holding and Houston Electric | February 2021 Winter Storm Event | Loss from Catastrophes
Purchase Obligations
Number of pending lawsuits | lawsuit			160
Utility Holding, LLC | February 2021 Winter Storm Event
Purchase Obligations
Number of pending lawsuits | day			20
Posey Solar
Purchase Obligations
Solar array asset, useful life		35 years
Solar array generating capacity (in Megawatts) | MW					191
Pike Solar
Purchase Obligations
Solar array generating capacity (in Megawatts) | MW				130

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