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Short-term Borrowings and Long-term Debt - Debt Transactions (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)
General Mortgage Bonds | Houston Electric
Debt Instrument [Line Items]
Principal amount of debt issued	$ 1,600
Senior Notes and Term Loan | CERC Corp
Debt Instrument [Line Items]
Principal amount of debt issued	1,000
Senior Note and GMBs
Debt Instrument [Line Items]
Principal amount of debt issued	2,600
General Mortgage Bonds 3.00% Due 2032 | General Mortgage Bonds | Houston Electric
Debt Instrument [Line Items]
Principal amount of debt issued	$ 300
Debt instrument interest rate (as a percent)	3.00%
General Mortgage Bonds 3.60% Due 2052 | General Mortgage Bonds | Houston Electric
Debt Instrument [Line Items]
Principal amount of debt issued	$ 500
Debt instrument interest rate (as a percent)	3.60%
General Mortgage Bonds 4.45% Due 2032 | General Mortgage Bonds | Houston Electric
Debt Instrument [Line Items]
Principal amount of debt issued	$ 500
Debt instrument interest rate (as a percent)	4.45%
General Mortgage Bonds 4.85% Due 2052 | General Mortgage Bonds | Houston Electric
Debt Instrument [Line Items]
Principal amount of debt issued	$ 300
Debt instrument interest rate (as a percent)	4.85%
CERC Senior notes 4.40% due 2032 | Senior Notes | CERC Corp
Debt Instrument [Line Items]
Principal amount of debt issued	$ 500
Debt instrument interest rate (as a percent)	4.40%
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees	$ 495
CERC Term Loan due 2023 | Term Loan | CERC Corp
Debt Instrument [Line Items]
Principal amount of debt issued	500
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees	$ 500
CERC Term Loan due 2023 | Term Loan | CERC Corp | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Adjustment to basis spread (as a percent)	0.10%
CERC Term Loan due 2023 | Term Loan | CERC Corp | Secured Overnight Financing Rate
Debt Instrument [Line Items]
Basis spread (as a percent)	0.70%
General Mortgage Bonds Issued In February 2022 | General Mortgage Bonds | Houston Electric
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees	$ 784
General Mortgage Bonds Issued In September 2022 | General Mortgage Bonds | Houston Electric
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees	$ 789

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