A team could claim him off waivers and pay him the remainder of his contract. There's no chance that would happen.
Once he clears waivers, the Brewers could attempt to send him to the minors, but he would have the right to refuse the assignment and become a free agent. Either way, the Brewers will still owe him the remainder of his contract.
If he becomes a free agent and signs with another team, the Brewers will still owe him the remainder of his contract minus any money he makes from other teams. So, if he signs for the league minimum, the Brewers would owe him $12.1 million, with the other $400lk being paid by his new team.