GE says to sell remaining 49 percent stake in NBC to Comcast

General Electric Co said on Tuesday that it would sell the remainder of its stake in NBC Universal to Comcast Corp for $18.1 billion in cash, debt and stock.

The largest U.S. conglomerate said it had raised its authorized stock buyback to $35 billion and plans to buy back $10 billion worth of shares in 2013.

(Reporting By Scott Malone; Editing by Gary Hill)