Pros
Get to work with very intelligent people who also can have fun. Variety of things to work on due to huge company size. Chance to work with people from other countries on a daily basis. Great name to have on your resume. Benefits are very comprehensive and insurance premiums lower than others. Have good training offerings and they encourage people to go.
Cons
Lots of pressure to complete the project no matter what personal circumstances you may have. Career advancement depends on the economy, in good times there are opportunities, in bad, you'll be stagnant for a while. Senior leaders are competent but manage more than lead. Few people in management positions are willing to step up and give people constructive criticism. Recognition depends on who you report to, some are better than others.