I don't know what the structure of your company is, but many of the larger companies i've worked for has had some kind of 'complaints department', although that was never what it was called. In one company, if you saw something bad happened, you went to the CEO's assistant. In another company, it was the head of HR. I don't think any of this was officially stated, but people generally knew, if you're having a serious problem, this is person is the release valve. It's the person who you go to and say, "I don't want to go over my boss's head, but...," or "I don't know who to talk to about this, but..."
In a big bureaucratic company, they should have some person, or some kind of mechanism, for complaints about your own boss that isn't breaking the chain of command. They might not be able to fix the problem, but they might be able to give you advice on what to do, from the perspective of someone who knows your company.