A banking union should therefore be set up in the Union, underpinned by a comprehensive and detailed single rulebook for financial services for the internal market as a whole and composed of a single supervisory mechanism and new frameworks for deposit insurance and resolution. In view of the close links and interactions between Member States whose currency is the euro, the banking union should apply at least to all euro area Member States. With a view to maintaining and deepening the internal market, and to the extent that this is institutionally possible, the banking union should also be open to the participation of other Member States.