To the best of my experience, and that's a book I'm afraid, here's how the "Not invented here" rule works;
The best you can hope for when approaching an established company with an independent idea or innovation, is often to meet with the Technical manager or Director. This might seem all very locical and fine, but this guy will have every reason in the book to shoot you down, when he sees little reason to admit to his boss that there's someone smarter than him out there. And if he honestly believes in you, he might try his best to steal the concept, circumvent your patent and launch it as his own idea.
And the VP? He is typically not an engineer anyway, why he will always delegate.
Having said that, there are exceptions to the NIH rule, but most often it takes contacts and references to get anywhere. But for those of us who lives in socialistic countries, if it's green-energy-related, there are alway ways get government funding to develop the idea on your own, thereby also generate some free publicity.
"Bernoulli is a nine-letter name"