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Short-term Borrowings and Long-term Debt - Debt Repayments and Redemptions (Details) - USD ($) $ in Millions			12 Months Ended
	Dec. 15, 2023	Jan. 17, 2023	Dec. 31, 2023
Long-term Debt
Debt Instrument [Line Items]
Principal amount of debt issued			$ 3,023
CERC Corp
Debt Instrument [Line Items]
Principal amount of debt issued			$ 2,000
CERC Corp | Senior Notes
Debt Instrument [Line Items]
Debt instrument interest rate (as a percent)			0.70%
CERC Corp | Long-term Debt
Debt Instrument [Line Items]
Principal amount of debt issued			$ 2,332
CERC Term Loan Zero Point Seven Due 2023 | CERC Corp
Debt Instrument [Line Items]
Principal amount of debt issued			$ 500
CERC Term Loan Zero Point Seven Due 2023 | CERC Corp | SOFR
Debt Instrument [Line Items]
Debt instrument interest rate (as a percent)			0.70%
CERC Senior Notes 0.70 percentage Due 2023 | CERC Corp | Long-term Debt | Senior Notes
Debt Instrument [Line Items]
Principal amount of debt issued			$ 700
Debt instrument interest rate (as a percent)			0.70%
CERC Floating Rate Senior Notes Zero Point Five Percentage Due 2023 | CERC Corp | Long-term Debt | Senior Notes
Debt Instrument [Line Items]
Principal amount of debt issued			$ 575
CERC Floating Rate Senior Notes Zero Point Five Percentage Due 2023 | CERC Corp | LIBOR Plus | Long-term Debt | Senior Notes
Debt Instrument [Line Items]
Debt instrument interest rate (as a percent)			0.50%
CERC Term Loan 0.85% Due 2024 | CERC Corp | Term Loan
Debt Instrument [Line Items]
Principal amount of debt issued			$ 500
CERC Term Loan 0.85% Due 2024 | CERC Corp | SOFR | Term Loan
Debt Instrument [Line Items]
Basis spread (as a percent)			0.85%
Adjustment to basis spread (as a percent)			0.10%
CERC Senior Notes 3.72 percentage Due 2023 | CERC Corp | Long-term Debt | Senior Notes
Debt Instrument [Line Items]
Principal amount of debt issued			$ 57
Debt instrument interest rate (as a percent)			3.72%
CNP First Mortgage Bonds 4.00% Due 2044 | SIGECO | Long-term Debt | First Mortgage Bonds
Debt Instrument [Line Items]
Principal amount of debt issued		$ 11	$ 11
Debt instrument interest rate (as a percent)			4.00%
Debt instrument, redemption price (as a percent)		100.00%
CNP Term Loan 1.50% Due 2023
Debt Instrument [Line Items]
Principal amount of debt issued			$ 250
CNP Term Loan 1.50% Due 2023 | Term Loan
Debt Instrument [Line Items]
Principal amount of debt issued			$ 250
CNP Term Loan 1.50% Due 2023 | SOFR | Term Loan
Debt Instrument [Line Items]
Debt instrument interest rate (as a percent)			1.50%
Basis spread (as a percent)			1.50%
Adjustment to basis spread (as a percent)			0.10%
CERC Floating Rate Senior Notes Zero Point Six Five Percentage Due 2024 | Long-term Debt | Senior Notes
Debt Instrument [Line Items]
Principal amount of debt issued			$ 350
Debt instrument, redemption price (as a percent)	100.00%
CERC Floating Rate Senior Notes Zero Point Six Five Percentage Due 2024 | SOFR | Long-term Debt | Senior Notes
Debt Instrument [Line Items]
Debt instrument interest rate (as a percent)			0.65%
CNP First Mortgage Bonds 6.72% Due 2029 | SIGECO | Long-term Debt | First Mortgage Bonds
Debt Instrument [Line Items]
Principal amount of debt issued			$ 80
Debt instrument interest rate (as a percent)			6.72%
Basis spread (as a percent)			0.10%

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