How Much Do You Share?

For those of my readers who are also writers, I have a question. I know how I operate, but I'm curious to see what others do...

When it comes to a big project, I'm thinking particularly of novel-length, how many of the details do you share with others? Are you one who keeps mum about everything from the storyline to the progress you're making, choosing not to relinquish updates to anyone? Or do you talk things through with one person or more, because you like to share, or feel you work better through your project that way?

For me, I'm hesitant to give too much detail, either because I'll "jinx" myself, or look silly before my idea has fully developed. But I can't keep everything in. I have to give the basic rundown to my parents and a friend or two. I have to have that initial feedback to kick myself into drive. And I periodically update my husband ("I hit 1000 words and a new chapter today!"), or run a scene by him, ask for input.

How do you work? What do you share?