6. Subcontracted work and other external costs
(in millions of euros) | 2017 | 2016 |
Subcontracted work | 73 | 75 |
Cleaning | 95 | 87 |
Maintenance | 122 | 149 |
IT costs | 185 | 170 |
Total | 475 | 481 |
The costs of subcontracted work are the costs relating to the execution of assignments by third parties that are not covered by the other items in this category.