| Cover Page | Jun. 29, 2023 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jun. 29, 2023 |
| Entity Registrant Name | SOUTHERN INDIANA GAS AND ELECTRIC COMPANY |
| Entity Central Index Key | 0000092195 |
| Entity File Number | 001-03553 |
| Entity Tax Identification Number | 35-0672570 |
| Entity Incorporation, State or Country Code | IN |
| Entity Address, Address Line One | 211 NW Riverside Drive |
| Entity Address, City or Town | Evansville |
| Entity Address, State or Province | IN |
| Entity Address, Postal Zip Code | 47708 |
| City Area Code | 812 |
| Local Phone Number | 491-4000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Current Fiscal Year End Date | --12-31 |
| SIGECO SECURITIZATION I, LLC [Member] | |
| Document Information [Line Items] | |
| Entity Registrant Name | SIGECO SECURITIZATION I, LLC |
| Entity Central Index Key | 0001968445 |
| Entity File Number | 333-270851-01 |
| Entity Tax Identification Number | 92-2762878 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 211 NW Riverside Drive |
| Entity Address, Address Line Two | Suite 800-04 |
| Entity Address, City or Town | Evansville |
| Entity Address, State or Province | IN |
| Entity Address, Postal Zip Code | 47708 |
| City Area Code | 812 |
| Local Phone Number | 491-4141 |
