Pros
Expedia is a company that truly cares for its employees. It fosters a feeling of trust and collaboration between employees. Throughout my time there, I felt that the way my managers treated their directs was one of utmost respect and deep care. If something is going wrong, you will be given feedback and advice very quickly so you can adjust whatever needs to be adjusted. As a result, the people I have worked with oftentimes mirror the way they are treated by their managers and everyone will go out of their way to help you succeed and make your journey a pleasant one. People tend to be well-versed and engineers are definitely not the stereotypical reclusive programmers we've heard countless jokes on.
Kontras
The biggest downside I can think of is the lack of innovation and how risk averse the company has become. Unless it's coming from the ground up, teams can end up working on some very minor tasks that are neither disruptive nor truly valuable for the business. If you have a team that promotes innovation and a manager that is willing to push it upward, then you will have a great time otherwise you may end up being bored and unmotivated. In my opinion, the company is clearly not innovating enough and is losing its standing but instead of trying to tackle this, upper management has been reshuffling organizations around in countless reorgs it's become dizzying.