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Short-term Borrowings and Long-term Debt - Debt Transactions (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)
CNP Term Loan 1.50% Due 2023
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 250
CERC
Debt Instrument [Line Items]
Aggregate Principal Amount	1,700
General Mortgage Bonds | Houston Electric
Debt Instrument [Line Items]
Aggregate Principal Amount	900
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees	890
Proceeds from debt, amount used for general limited liability purposes	593
Proceeds form issuance of debt, amount to be disbursed or allocated to finance or refinance projects	296
General Mortgage Bonds | Houston Electric | General Mortgage Bonds 4.95% Due 2033
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 600
Interest rate of debt (as a percent)	4.95%
General Mortgage Bonds | Houston Electric | General Mortgage Bonds 5.30% Due 2033
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 300
Interest rate of debt (as a percent)	5.30%
Term Loan
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees	$ 250
Term Loan | CNP Term Loan 1.50% Due 2023
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 250
Term Loan | CNP Term Loan 1.50% Due 2023 | SOFR
Debt Instrument [Line Items]
Interest rate of debt (as a percent)	1.50%
Term Loan | CERC | CERC Term Loan 5.25% Due 2024
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 500
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees	$ 500
Term Loan | CERC | CERC Term Loan 5.25% Due 2024 | SOFR
Debt Instrument [Line Items]
Interest rate of debt (as a percent)	0.85%
Term Loan | CERC | CERC Senior Notes .70% due 2023 | SOFR
Debt Instrument [Line Items]
Adjustment to basis spread (as a percent)	0.10%
Senior Notes | CERC
Debt Instrument [Line Items]
Interest rate of debt (as a percent)	0.70%
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees	$ 1,200
Senior Notes | CERC | CERC Senior Notes 5.25% Due 2028
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 600
Interest rate of debt (as a percent)	525.00%
Senior Notes | CERC | CERC Senior Notes 5.40% Due 2033
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 600
Interest rate of debt (as a percent)	540.00%
First Mortgage Bonds | SIGECO | CNP First Mortgage Bonds 4.98% Due 2028
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 100
Interest rate of debt (as a percent)	4.98%
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees	$ 179
First Mortgage Bonds | SIGECO | CNP First Mortgage Bonds 5.04% Due 2033
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 80
Interest rate of debt (as a percent)	504.00%
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees	$ 179
Senior Note, Term Loan , FMBs and GMBs
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 3,030

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