After Big Bet, Google Is to Sell Motorola Unit - NYTimes.com

$12.5B - $2.9B cash - $2.35B set-top - $2.91B from Lenovo - assorted transaction costs = probably not a bad deal on the remaining patent portfolio

"It is unclear exactly how much money Google lost on the Motorola deal over all. In addition to the patents Google is keeping, Google sold Motorola Home, the portion of the business that made set-top boxes, to Arris in 2012 for $2.35 billion. Motorola also had $2.9 billion cash on hand when Google bought it.

Google is also retaining a small division working on cutting-edge technologies, led by Regina Dugan, who was hired from the government’s Defense Advanced Research Projects Agency."

After Big Bet, Google Is to Sell Motorola Unit - NYTimes.com