ESPN is owned by Disney: http://corporate.disney.go.com/
So ask the Mouse.
Edit - Here's their 10-Q http://dolimg.com/investorrelations/webcasts/q2-earnings-2011_kdaijbjdkl2.pdf
But in scanning it, I do not see where Disney break out the revenue on the level of detail you are asking for. The closest I see is what Disney call "Cable Networks", which includes ESPN, ABC FAmily, and the Disney Channels. That number is $1.357 Billion