Mike Blake/File PhotoComcast plans to spin off some NBCUniversal cable channels.The planned spinoff includes MSNBC, CNBC, E!, and Oxygen, among others.NBC, Bravo, and the streaming service Peacock would not be spun off under the plan.Comcast is planning to break off some of its cable television channels.The plan to spin off some NBCUniversal channels includes MSNBC, CNBC, USA, Oxygen, E!, Syfy, and the Golf Channel, while NBC, Bravo, and the streaming service Peacock would remain under NBCUniversal, a source close to the plans told Business Insider.The assets that are part of the planned spinoff generated $7 billion in revenue during the year that ended in September, according to The Wall Street Journal, which first reported that the spinoff was going ahead.Comcast believed the spinoff, which would take about a year, would enable growth in NBCUniversal's remaining assets, The Journal reported.The outlet also said the new entity's ownership structure would be similar to Comcast's and that Mark Lazarus, currently chairman of NBCUniversal's media group, would be named CEO.Comcast declined to comment when reached by Business Insider.Comcast said it was exploring spinning off its cable networks late last month, with BI's Peter Kafka writing that the move served as yet another signal of cable TV's decline.