Kant's concept of autonomy - individual and collective at the same time.

In "The Groundwork of the Metaphysics of Morals" and "The Critique of Practical Reason", we can find many concepts that refer directly to politics and collective situations. The will is "universally legislative", the ethical ideal is "the kingdom of ends". Does the fact that such concepts exist on the moral level testify to the collective nature of the autonomous will ultimately behind our decisions? All the more so because when modelling his concept of the will, Kant often looked towards the enigmatic concept of the "general will" by J. J. Rousseau. So what, according to Kant, is the nature of the autonomous will, individual or collective? The thesis that I would like to present in my presentation will be the statement that this concept combines both of these features in a specific way and, consequently, cannot be unequivocally assigned to either of these two types.