How the Chiefs can clinch a playoff spot:
1) KC win + MIA loss or tie OR
2) KC win + BAL loss or tie OR
3) KC tie + MIA loss OR
4) KC tie + BAL loss
How the Broncos can clinch a playoff spot:
1) DEN win or tie OR
2) MIA loss or tie OR
3) BAL loss or tie
The Broncos play the Titans in Denver, so they're probably going to win.
How the Patriots can clinch a playoff spot:
1) NE win + MIA loss or tie (AFC East) OR
2) NE tie + MIA loss (AFC East)
3) NE win + BAL loss or tie OR
4) NE tie + BAL loss
The Patriots can clinch the division title in early December. As usual.
How the Colts can clinch the AFC South:
1) IND win OR
2) TEN loss OR
3) IND tie + TEN tie
The Chiefs will play the Colts this season. It's possible both teams have clinched a playoff spot by then.
If you haven't used it yet, check out ESPN's Playoff Machine. Pretty neat tool.