| Document And Entity Information | Feb. 09, 2023 |
| Document Information Line Items | |
| Entity Registrant Name | AEI INCOME & GROWTH FUND 26 LLC |
| Trading Symbol | NONE |
| Document Type | 8-K |
| Amendment Flag | false |
| Entity Central Index Key | 0001326321 |
| Document Period End Date | Feb. 09, 2023 |
| Entity Emerging Growth Company | false |
| Entity File Number | 000-51823 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 41-2173048 |
| Entity Address, Address Line One | 30 East 7th Street, Suite 1300 |
| Entity Address, City or Town | St. Paul |
| Entity Address, State or Province | MN |
| Entity Address, Postal Zip Code | 55101 |
| City Area Code | 651 |
| Local Phone Number | 227-7333 |
| Entity Information, Former Legal or Registered Name | Not Applicable |
| Security Exchange Name | NONE |
| Title of 12(g) Security | Limited Partnership Units |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
