Pros
Lots of upward mobility for the talented and politically savvy. Overall an ethical company. Salaried professionals tend to be well-paid - most other industries and especially smaller companies cannot compete with the compensation. If you are a conscientious type (look that up in the Big 5 personality traits), then you'll love and do well at this company and you'll be rewarded with promotions every 2-3 years. Conscientious types tend to be less creative and more industrious in their work habits. This company also takes safety very seriously at the corporate and mill-leadership levels.
Cons
As with any large corporation, there is entirely too much red tape. This comes with having 50K+ employees so this isn't a personal strike against IP as company but its just a common characteristic found in companies of this magnitude. The company has international agendas that it panders to, namely with the UN, WEF, etc. so that may or may not be a problem for some. In many settings, there is pressure to conform and a fear of speaking up and telling the truth the way you see it, especially if it goes against the prevailing narrative. Lastly, more about the creativity piece - This company is very mature commodities-based company and therefore has less need for someone to re-invent the wheel for them. Creativity is difficult to express in such rigid, mature industrial processes such as making paper for the largest paper company in the world. If having a creative role is your cup of tea, consider looking for a company that is still young in their business life cycle and who has a demand for innovation on a much shorter time frame. Those industries will be more appreciative of creative types (openness to experience). Again, go look up what a creative person is like in the Big 5 personality traits and go listen to Jordan Peterson on the subject of corporations and openness vs. conscientiousness. That will give you a better idea of what you're up against with this industry. If you are a creative type and you choose to work at IP, my recommendation is to have a creative hobby on the side that you take very seriously so that you can satisfy your innate desire to create something new. It is my belief that the company will fail to offer adequate opportunities to be creative - this ties back in to the company being too big for its own good and has too much red tape - such size and red tape limits how much creativity the company can entertain and the margins are too low and the stakes are too high for them to be taking large risks with paradigm-shifting ideas. Consider yourself adequately warned!