Mel Gibson's ex-wife Robyn snagged a big chunk of Mel's retirement package ... TMZ has learned.
According to documents filed in the couple's divorce case and obtained by TMZ, Robyn got the following per their agreement:
-- Half of the Screen Actors Guild pension benefits Mel accumulated during the 31 years of their marriage.
-- A big chunk of Mel's Directors Guild of America pension benefits
-- Half of the 401(k) benefits Mel accumulated through their production company -- Icon -- during their marriage.
As TMZ previously reported ... the couple also divided earnings and property ... roughly estimated at $800 million and we're told Robyn got roughly half.