How many times have the Packers played the Lions in Detroit on Thanksgiving Day?

Green Bay has played the Lions 18 times in Detroit on Thanksgiving day. The Lions have won 11 of the 18 matchups and there has been just one tie.

The two teams played on Thanksgiving for 13 straight years (1951-1963), then took a 21 year rest before renewing the matchup in 1984.

http://www.packers.com/history/record_book/results_and_rosters/thanksgiving_games/