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v3.23.1

Short-term Borrowings and Long-term Debt - Debt Transactions (Details) $ in Millions | 3 Months Ended
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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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