Lilly says it doesn't tolerate retaliation, but, as a whole, the company does a lot to look the other way when people report it or other HR concerns. Retaliation, as with other forms of HR violations on the part of managers/leadership, is often subtle in nature and difficult to prove. Most of the time, people don't document their abuse in a written manner. Yes, you can document things, but it's still a he-said-she-said, unless you can get others to also back you up and report.
I reported a manager (Ericka Riding) for creating a hostile work environment. She was so toxic and two-faced that I was hesitant to name others on my team who could support me, since I knew she would target them (and she did). People were terrified of her because her tactics were subtle. She would say one thing, but document something else. I later found out, she was no stranger to having HR cases against her, so she also knew how to game the system. That entire team has pretty much jumped ship, except for the few stragglers that have had a more difficult time finding other job opportunities.
Someone once referred to Lilly as the Catholic Church of Pharma with its tendency to "rotate" troublesome managers.