If you're in Engineering, be prepared to Lean In and make an extra effort to counteract the "brogrammer" culture that, in my opinion, is still subtly pervasive. Outside of Eng, it really depends on the org you're a member of.
I have worked here for nearly 5 years. In my experience, my gender has never been a consideration to how I operate, am perceived or have been developed...I have had incredible opportunities based on merit and hardwork.
My very first team at this company was 50% women, which is unheard of anywhere else, but not an uncommon thing here. I don't about pay, but women are highly respected and often treated better than men at this company.
I worked there for over five years and have no regrets. It was the most stimulating and impactful job I'll probably ever have. Constant availability was expected, and you only had work-life balance if work was your life... but when your job impacts over a billion people, that's probably reasonable.