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v3.23.1

Short-term Borrowings and Long-term Debt - Schedule of Revolving Credit Facilities (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2023 USD ($)
Debt Instrument [Line Items] |
Aggregate principal amount | $ 4,000
Houston Electric |
Debt Instrument [Line Items] |
Aggregate principal amount | 300
Restoration costs | 100
CERC |
Debt Instrument [Line Items] |
Aggregate principal amount | $ 1,050
Line of Credit | Maximum |
Debt Instrument [Line Items] |
Percentage on limitation of debt to total capitalization under covenant amended (in hundredths) (as a percent) | 70.00%
Line of Credit | Houston Electric |
Debt Instrument [Line Items] |
Ratio of indebtedness to net capital (as a percent) | 0.675
Percentage on limitation of debt to total capitalization under covenant (as a percent) | 52.40%
Consecutive period for system restoration costs to exceed $100 million (in months) | 12 months
Line of Credit | Houston Electric | Maximum |
Debt Instrument [Line Items] |
Percentage on limitation of debt to total capitalization under covenant amended (in hundredths) (as a percent) | 70.00%
Line of Credit | CERC |
Debt Instrument [Line Items] |
Ratio of indebtedness to net capital (as a percent) | 0.650
Percentage on limitation of debt to total capitalization under covenant (as a percent) | 45.20%
Line of Credit | SOFR Plus | Houston Electric |
Debt Instrument [Line Items] |
Basis spread on variable rate (as a percent) | 1.25%
Line of Credit | SOFR Plus | CERC |
Debt Instrument [Line Items] |
Basis spread on variable rate (as a percent) | 1.125%
Parent Company |
Debt Instrument [Line Items] |
Aggregate principal amount | $ 2,400
Parent Company | Line of Credit |
Debt Instrument [Line Items] |
Ratio of indebtedness to net capital (as a percent) | 0.650
Percentage on limitation of debt to total capitalization under covenant (as a percent) | 60.60%
Parent Company | Line of Credit | SOFR Plus |
Debt Instrument [Line Items] |
Basis spread on variable rate (as a percent) | 1.50%
SIGECO |
Debt Instrument [Line Items] |
Aggregate principal amount | $ 250
SIGECO | Line of Credit |
Debt Instrument [Line Items] |
Ratio of indebtedness to net capital (as a percent) | 0.650
Percentage on limitation of debt to total capitalization under covenant (as a percent) | 47.00%
SIGECO | Line of Credit | SOFR Plus |
Debt Instrument [Line Items] |
Basis spread on variable rate (as a percent) | 1.125%

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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