Apple used a "complex web" of offshore entities — with no employees or physical offices — that allowed it to pay little or no taxes on tens of billions it earned overseas, according to a Senate investigation unveiled Monday.

Between 2009 and 2012, the company shielded at least $74 billion in profits from U.S. tax laws by setting up subsidiaries in Ireland under a special arrangement, the report said. While the practice of using foreign operations to avoid U.S. taxes is legal and common among multinationals, Apple's scheme was unprecedented in its use of multiple affiliates that had no semblance of a physical presence, Senate staffers said.

The electronics giant's rootless subsidiaries had just one purpose: to funnel much of the company's global profits and dodge billions of dollars in U.S. tax obligations, according to the report by the Permanent Subcommittee on Investigations.