Government-controlled mortgage giant Freddie Mac has requested $6 billion in additional aid after posting a wider loss in the third quarter. Freddie Mac said Thursday that it lost $4.4 billion, or $1.86 per share, in the July-September quarter. That compares with a loss of $4.1 billion, or $1.25 a share, in the same quarter of 2010. This quarter's $6 billion request from taxpayers is the largest since April 2010.