Similar to M&T at UPenn.
No, not a joint major. Though Management is a very common double major choice. Indeed about half of the undergraduate majors in the business school are double majors, which is significantly more than almost any other major. The most common double majors are with Electrical Engineering, Computer Science, Mathematics, and Economics, though others are possible. Alternatively the Management school offers two minors (one in Management and one in Management Science). See http://mitsloan.mit.edu/undergrad/major-and-minors/compare-programs/
And note that to double-major, you just have to complete the requirements for both majors – any class that’s required for both majors, or could fulfill a requirement for both, can be double-counted.