The Chiefs have beat the Raiders which means they are locked in at 11-5 on the season. But they are not locked into their playoff seed. A Broncos loss means the Chiefs win the AFC West while a Broncos win means the Broncos win the AFC West.
The Chiefs game ended before the Chargers-Broncos game so Arrowhead played the game in the stadium. It's the fourth quarter of that game as I type this so I don't know yet if those Chiefs fans will like the ending.