Pros
Very nice office in downtown Chicago. Great location, close to both train stations. People are generally nice. Internal training programs are available for those with time to spare. There are several business resource groups to be involved in as well as Toastmasters which makes the work day/week pleasant.
Cons
Very work group oriented. Several layoffs so far in 2015 with many more expected. This is a cyclical process that happens every 3 - 5 years. Appears to be done to rid themselves of the aging population as well as under achievers. Cater towards interns and programs involving new hires right out of college offering a robust rotational training in several areas of the business. Unfortunately this is not available to experienced new hires which leaves them to fend for themselves. If you hire in for one function it is difficult to demonstrate other areas of expertise. Internal interviews focus narrowly on achievements at BP and consider related past experience prior to BP useless.