Typically, the Chiefs never announce signings or even confirm that they've agreed to a deal until the player has passed his physical. That came Friday night, although the team didn't reveal terms.
NFL Network insider Jason La Canfora cited a league source in reporting that Berry's deal is for six years and $60 million, with $34 million guaranteed. That would make him the highest-paid safety in league history.
Berry, the fifth overall pick in the 2010 draft, wasn't at the Chiefs' first practice at their new facility in St. Joseph, Mo., but he said on his Twitter account that he soon would be.
"Bout to head to St. Joe!!! Aka the deals done," he tweeted.
Messages to Berry's agent by The Associated Press weren't immediately returned, and the Chiefs refused to comment.
The defensive secondary was one of the weakest areas on one of the weakest defenses in the NFL last year, a big reason that Kansas City finished 4-12 and gave up big plays almost every game.
The Associated Press contributed to this report.