Comcast ( CMCSA) filed plans Monday to raise cash through a securities offering. The so-called shelf filing with regulators did not specify whether the offering would be debt or stocks, nor did it indicate an amount Comcast is seeking to raise. Comcast will use the proceeds to pay for operations and general corporate purposes, according to the filing. The No. 1 cable company carries $32.5 billion in total debt as of the end of 2008. Of that debt, $5.3 billion is due between now and 2011.. Comcast has been cutting spending as the economy has begun to slow. It also faces strong TV competition from telcos like Verizon ( VZ) and AT&T ( T), which both posted surprisingly strong numbers in recent days. Comcast shares were unchanged in afterhours trading Monday.