There will be a formal announcement by Dan Akerson later this morning, but now that the U.S. government has divested all of its bailout related shares in General Motors,  Detroit radio stations are reporting that Dan Akerson will be stepping down as Chief Executive Officer of GM and be replaced by Mary Barra. Barra, who has been seen as Akerson’s possible replacement since she took over responsibility for global product development, will be the first woman to run a major American automobile company. More information later, after the Akerson press conference.