The Liberal Arts are originally those pursuits (arts) deemed worthy of a late-Roman free (hence Liberal) man. Taken up in the nineteenth century, the idea is applied to free citizens in a free society (and some skools run by abolitionists were very aggressive in their application of the ideal).
The 6th-century codification of the liberal arts that formed the original "undergraduate" curriculum at the first universities was:
Trivium: grammar, rhetoric, and logic
Quadrivium: arithmetic, geometry, music, astronomy
To which they added Physics and Metaphysics
So, yeah, it was all what they called "philosophy"
Engineering? That's for slaves.
In short, a Liberal Arts degree is by definition not a degree for a career, but someone with a Liberal Arts degree has the critical skills and interests to be a valuable asset. The rest you'd have to train anyway.