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Short-term Borrowings and Long-term Debt - Debt Transactions (Details)
$ in Millions
6 Months Ended
Jun. 30, 2023
USD ($)
CERC  
Debt Instrument [Line Items]  
Aggregate Principal Amount $ 2,000
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
Term Loan  
Debt Instrument [Line Items]  
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees $ 250
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
Securitization Bonds  
Debt Instrument [Line Items]  
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees 337
Senior Notes, Term Loan, Securitization Bonds, FMBs and GMBs  
Debt Instrument [Line Items]  
Aggregate Principal Amount 3,671
General Mortgage Bonds 4.95% Due 2033 | General Mortgage Bonds | Houston Electric  
Debt Instrument [Line Items]  
Aggregate Principal Amount $ 600
Interest rate of debt (as a percent) 4.95%
General Mortgage Bonds 5.30% Due 2033 | General Mortgage Bonds | Houston Electric  
Debt Instrument [Line Items]  
Aggregate Principal Amount $ 300
Interest rate of debt (as a percent) 5.30%
CERC Term Loan 5.25% Due 2024 | Term Loan | CERC  
Debt Instrument [Line Items]  
Aggregate Principal Amount $ 500
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees $ 500
CERC Term Loan 5.25% Due 2024 | Term Loan | CERC | SOFR  
Debt Instrument [Line Items]  
Basis spread on variable rate (as a percent) 0.85%
CERC Senior Notes 5.25% Due 2028 | Senior Notes | CERC  
Debt Instrument [Line Items]  
Aggregate Principal Amount $ 600
Interest rate of debt (as a percent) 525.00%
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees $ 308
Interest Payable 3
CERC Senior Notes 5.40% Due 2033 | Senior Notes | CERC  
Debt Instrument [Line Items]  
Aggregate Principal Amount $ 600
Interest rate of debt (as a percent) 540.00%
CNP First Mortgage Bonds 4.98% Due 2028 | First Mortgage Bonds | SIGECO  
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
CNP First Mortgage Bonds 5.04% Due 2033 | First Mortgage Bonds | SIGECO  
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
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%
Basis spread on variable rate (as a percent) 1.50%
CNP Securitization Bonds | Securitization Bonds | SIGECO  
Debt Instrument [Line Items]  
Aggregate Principal Amount $ 341
CNP Securitization Bonds | Securitization Bonds | SIGECO | Minimum  
Debt Instrument [Line Items]  
Interest rate of debt (as a percent) 5.026%
CNP Securitization Bonds | Securitization Bonds | SIGECO | Maximum  
Debt Instrument [Line Items]  
Interest rate of debt (as a percent) 5.172%
CERC Senior Notes .70% due 2023 | Term Loan | CERC | SOFR  
Debt Instrument [Line Items]  
Adjustment to basis spread (as a percent) 0.10%
Term Loan Due February 2024 | Term Loan | CERC  
Debt Instrument [Line Items]  
Aggregate Principal Amount $ 500
CERC Senior Notes, 5.25% Due May 2028 | Senior Notes | CERC  
Debt Instrument [Line Items]  
Aggregate Principal Amount $ 300
Interest rate of debt (as a percent) 525.00%