That's not really true, though. Motorola Mobility had ~$3B in cash at the acquisition point, and Google immediately sold off the cable box unit to Arris for $2.35B. Add in the ~$3B from this sale, and we are now at a cost of ~$4B. And I believe there were several tax advantages for Google, so it wouldn't surprise me if this whole acquisition only cost around $1B or so (and they keep the patents).