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Short-term Borrowings and Long-term Debt - Debt Repayments and Redemptions (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Jan. 17, 2023
CNP Term Loan 1.50% Due 2023
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 250
CNP Term Loan 1.50% Due 2023 | Term Loan
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 250
CNP Term Loan 1.50% Due 2023 | Term Loan | SOFR
Debt Instrument [Line Items]
Interest rate of debt (as a percent)	1.50%
CERC
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 1,700
CERC | Senior Notes
Debt Instrument [Line Items]
Interest rate of debt (as a percent)	0.70%
CERC | CERC Term Loan 0.70%Due 2023
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 500
CERC | CERC Term Loan 0.70%Due 2023 | SOFR
Debt Instrument [Line Items]
Interest rate of debt (as a percent)	0.70%
CERC | CERC Senior Notes .70% due 2023 | Term Loan | SOFR
Debt Instrument [Line Items]
Adjustment to basis spread (as a percent)	0.10%
Long-term Debt
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 2,036
Long-term Debt | CERC
Debt Instrument [Line Items]
Aggregate Principal Amount	1,775
Long-term Debt | CERC | CERC Senior Notes 0.70% Due 2023 | Senior Notes
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 700
Interest rate of debt (as a percent)	0.70%
Long-term Debt | CERC | CERC Floating Rate Senior 0.5% Due 2023 | Senior Notes
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 575
Long-term Debt | CERC | CERC Floating Rate Senior 0.5% Due 2023 | Senior Notes | LIBOR Plus
Debt Instrument [Line Items]
Interest rate of debt (as a percent)	0.50%
Long-term Debt | SIGECO | CNP First Mortgage Bonds 4.00% Due 2044 | First Mortgage Bonds
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 11	$ 11
Interest rate of debt (as a percent)	4.00%
Long-term Debt | SIGECO | CNP First Mortgage Bonds Due 2044 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt instrument, redemption price (as a percent)	100.00%

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