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v3.23.1

Short-term Borrowings and Long-term Debt - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 30, 2023 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
Letters of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term line of credit |  |  | $ 12.0 | $ 11.0
CERC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal Amount |  |  | 1,700.0 |
CERC | Letters of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term line of credit |  |  | 1.0 | 0.0
Houston Electric | Letters of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term line of credit |  |  | 0.0 | 0.0
Houston Electric | General Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal Amount |  |  | 900.0 |
Secured debt |  |  | 7,100.0 |
General mortgage bonds used as collateral |  |  | $ 68.0 |
Percentage of property additions (as a percent) |  |  | 70.00% |
Additional first mortgage bonds and general mortgage bonds that could be issued |  |  | $ 4,400.0 |
SIGECO | Letters of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term line of credit |  |  | 0.0 | 0.0
SIGECO | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured debt |  |  | $ 457.0 |
Percentage of property additions (as a percent) |  |  | 70.00% |
Additional first mortgage bonds and general mortgage bonds that could be issued |  |  | $ 1,200.0 |
SIGECO | Forecast |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Additional proceeds ​from Issuance​ of ​secured​ tax​ exempt ​debt |  | $ 38.0 |  |
SIGECO | Subsequent Event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from issuance of secured tax exempt debt | $ 148.0 |  |  |
Vectren | Letters of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term line of credit |  |  | 0.2 |
Vectren | Maximum | Letters of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term line of credit |  |  | 5.0 |
Third Party AMAs |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Inventory financings |  |  | 0.0 | 11.0
Third Party AMAs | CERC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Inventory financings |  |  | $ 0.0 | $ 11.0
Environmental Improvement Revenue Bonds, Series 2013 | SIGECO | Subsequent Event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal Amount | 107.0 |  |  |
Environmental Improvement Revenue Bonds, Series 2014 | SIGECO | Subsequent Event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal Amount | $ 41.0 |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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