The relevant section of the google terms of service is the Your Content In Our Services section:
Some of our Services allow you to upload, submit, store, send or receive content. You retain ownership of any intellectual property rights that you hold in that content. In short, what belongs to you stays yours.
When you upload, submit, store, send or receive content to or through our Services, you give Google (and those we work with) a worldwide license to use, host, store, reproduce, modify, create derivative works (such as those resulting from translations, adaptations or other changes we make so that your content works better with our Services), communicate, publish, publicly perform, publicly display and distribute such content. The rights you grant in this license are for the limited purpose of operating, promoting, and improving our Services, and to develop new ones. This license continues even if you stop using our Services (for example, for a business listing you have added to Google Maps). Some Services may offer you ways to access and remove content that has been provided to that Service. Also, in some of our Services, there are terms or settings that narrow the scope of our use of the content submitted in those Services. Make sure you have the necessary rights to grant us this license for any content that you submit to our Services.
Our automated systems analyze your content (including emails) to provide you personally relevant product features, such as customized search results, tailored advertising, and spam and malware detection. This analysis occurs as the content is sent, received, and when it is stored.
I am not a lawyer and am not affiliated with google, but the answer clearly seems to be no. Your ideas stay your own intellectual property though google may use your submitted content within their products.
Addendum On the other hand though, if I had some secret information that could be used or sold to a competitor to make a lot of money (e.g., imagine a hedge fund with a trading algorithm that has a history of making billions) then I would never publicly share that information with any service regardless of their Terms of Service. I would only consider sharing it with people who are locked under very strong non-disclosure/non-compete agreements who only have access to the information on systems I control.
Even if the other business states they will not look at information I upload, I simply will not trust them and all their employees with my (unencrypted) information. The one exception may be to backup personal source code where I encrypted it locally on a trusted computer prior to uploading an encrypted copy (protected by a very strong passphrase).