One day, you'll peraph's sell your blog for one million dollar or will just have to give it to another person cause of lack of time to maintain it. If you have others blogs in your Blogger account and want to let the new owner to have a total access and control to his new blog without seeing you among administrators you can just transfer the blog to his account. This task is really simple like we will see it set by step.
1. Send an invitation to the new owner of the blog and set him as an administrator when he'll accept your invite.
2. The new administrator can now go in his blogger account and delete you as administrator and even author of the blog.
It's all, only this two step and you're done.