The singer made the announcement on Twitter on Monday. Hill called it a "difficult decision."
"Amazing 2 have been part of SNF - an honor. I've just let everyone there know it's time 2 let someone else rock the open," Hill tweeted.
Hill has been featured at the top of the broadcast for six years. "Sunday Night Football" executive producer Fred Gaudelli tweeted "great love and appreciation" to Hill.
It's unknown what producers plan to do with the show's opening now.
The Associated Press contributed to this report.