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Regulatory Matters - Narrative (Details)						12 Months Ended
	Sep. 11, 2024 MW	Mar. 06, 2024 USD ($) $ / KWH_Kilowatt_hour	Aug. 23, 2023 USD ($)	Apr. 05, 2023 USD ($)	Mar. 23, 2023 USD ($)	Dec. 31, 2021 USD ($) lease	Jan. 10, 2025 USD ($)	Dec. 31, 2024 USD ($)	Nov. 08, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jun. 29, 2023 USD ($)	Jan. 04, 2023 USD ($)	Dec. 31, 2022	Oct. 19, 2022 USD ($)	Jul. 01, 2022 USD ($)
Public Utilities, General Disclosures [Line Items]
Total Current Regulatory Assets								$ 239,000,000		$ 161,000,000
Regulatory assets								3,108,000,000		2,513,000,000
Total Regulatory Assets								3,347,000,000		2,674,000,000
Cost of recovery for power consumption | MW	32
Return on investment for power consumption | MW	5
Property, Plant and Equipment, Gross								42,667,000,000		40,396,000,000
Estimated case processing expenses and carrying costs									$ 502,000,000
Operation And Maintenance Expense | February 2021 Winter Storm
Public Utilities, General Disclosures [Line Items]
Total Regulatory Assets								19,000,000		17,000,000
Public Utility Commission Of Texas
Public Utilities, General Disclosures [Line Items]
Total Regulatory Assets								8,000,000		8,000,000
IURC
Public Utilities, General Disclosures [Line Items]
Regulatory asset, authorized issuance costs												$ 350,000,000
CERC
Public Utilities, General Disclosures [Line Items]
Total Current Regulatory Assets								238,000,000		161,000,000
Regulatory assets								903,000,000		850,000,000
Total Regulatory Assets								1,141,000,000		1,011,000,000
Property, Plant and Equipment, Gross								15,552,000,000		15,672,000,000
CERC | CERC
Public Utilities, General Disclosures [Line Items]
Regulatory liability, approximate total gas cost														$ 409,000,000
CERC | Minnesota Public Utility Commission
Public Utilities, General Disclosures [Line Items]
Disallowance of regulatory asset														$ 36,000,000
Houston Electric
Public Utilities, General Disclosures [Line Items]
Total Current Regulatory Assets								0		0
Regulatory assets								1,284,000,000		752,000,000
Total Regulatory Assets								1,284,000,000		752,000,000
Number of leases entered into | lease						2
Property, Plant and Equipment, Gross								21,750,000,000		19,515,000,000
Houston Electric | Minimum | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Intervenor recommended disallowances							$ 4,100,000
Houston Electric | Maximum | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Intervenor recommended disallowances							$ 101,900,000
Houston Electric | Operation And Maintenance Expense | February 2021 Winter Storm
Public Utilities, General Disclosures [Line Items]
Total Regulatory Assets								19,000,000		17,000,000
Houston Electric | Public Utility Commission Of Texas
Public Utilities, General Disclosures [Line Items]
Total Regulatory Assets								8,000,000		8,000,000
Recovery of deferred costs sought															$ 200,000,000
Houston Electric | Public Utility Commission Of Texas | TEEEF Lease One
Public Utilities, General Disclosures [Line Items]
Regulatory asset, revenue requirement amount				$ 39,000,000
Regulatory asset, amortization period				82 months 15 days
Houston Electric | Public Utility Commission Of Texas | TEEEF Lease Two
Public Utilities, General Disclosures [Line Items]
Regulatory asset, amortization period				78 months									102 months
Regulatory asset, annual revenue requirement amount				$ 188,000,000
Annual revenue increase from lease agreements				$ 149,000,000
Regulatory asset, revenue requirement amount reduction			$ 35,000,000
SIGECO | Subsidiaries
Public Utilities, General Disclosures [Line Items]
Regulatory asset, issued											$ 341,000,000
February 2021 Winter Storm Event
Public Utilities, General Disclosures [Line Items]
Regulatory liability, approximate total gas cost						$ 2,000,000,000
Total Current Regulatory Assets										86,000,000
Regulatory assets								67,000,000		130,000,000
February 2021 Winter Storm Event | Customer Rate Relief Bond Financing
Public Utilities, General Disclosures [Line Items]
Cash proceeds received from government grants					$ 1,100,000,000
February 2021 Winter Storm Event | CERC
Public Utilities, General Disclosures [Line Items]
Regulatory liability, approximate total gas cost						$ 2,000,000,000
Total Current Regulatory Assets										86,000,000
Regulatory assets								67,000,000		$ 130,000,000
February 2021 Winter Storm Event | CERC | Customer Rate Relief Bond Financing
Public Utilities, General Disclosures [Line Items]
Cash proceeds received from government grants					$ 1,100,000,000
February 2021 Winter Storm
Public Utilities, General Disclosures [Line Items]
Total Current Regulatory Assets								67,000,000
February 2021 Winter Storm | February 2021 Winter Storm
Public Utilities, General Disclosures [Line Items]
Regulatory asset, expected settlement		$ 50,000,000
Decrease in regulatory revenue		$ 1
Residential customers average usage | $ / KWH_Kilowatt_hour		1,000
February 2021 Winter Storm | CERC
Public Utilities, General Disclosures [Line Items]
Total Current Regulatory Assets								67,000,000
May 2024 Storm Events | Houston Electric
Public Utilities, General Disclosures [Line Items]
Total Regulatory Assets								73,000,000
Property, Plant and Equipment, Gross								345,000,000
Estimated storm restoration costs								458,000,000
Hurricane Harvey | Houston Electric
Public Utilities, General Disclosures [Line Items]
Total Regulatory Assets								442,000,000
Property, Plant and Equipment, Gross								654,000,000
Estimated storm restoration costs								$ 1,100,000,000

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