Elon Musk has said he is actively considering merging Tesla and SpaceX, his two biggest companies. "Do I think it would be a good idea? Yes," Musk said during a call with financial analysts to discuss SpaceX's latest results on Tuesday. While Musk noted it could not be assumed a merger will go ahead, and it would need shareholders' support, he said special committees within both companies had been formed to examine the move. "The special committees have not reached agreement on terms of any transaction and there's no guarantee that they will," he said. "But I do think there is a lot of merit to merging and a lot to be gained." With Tesla valued at roughly $1.5 trillion (1.1 trillion) and SpaceX at $2 trillion, a combination of the two companies would mark one of the largest mergers in history.