| Cover | Sep. 25, 2019 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Sep. 25, 2019 |
| Entity File Number | 1-3543 |
| Entity Registrant Name | DUKE ENERGY INDIANA, LLC |
| Entity Central Index Key | 0000081020 |
| Entity Tax Identification Number | 35-0594457 |
| Entity Incorporation, State or Country Code | IN |
| Entity Address, Address Line One | 1000 East Main Street |
| Entity Address, City or Town | Plainfield |
| Entity Address, State or Province | IN |
| Entity Address, Postal Zip Code | 46168 |
| City Area Code | 704 |
| Local Phone Number | 382-3853 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
