Your ask of between 1% and 5% of an 11b company comes out to between 100m and 550m for an idea. Without knowing your idea but with no patent, no track record of revenue or proof of concept, it's a steep ask.

At the very least, you need to make sure to have it patented before bringing it to the company, because it would be very easy to build the app at a much lower cost than your ask.