In order to balance the merged league , all ten of the former AFL teams along with the NFL 's Cleveland Browns , Pittsburgh Steelers , and Baltimore Colts formed the AFC , while the remaining 13 NFL teams formed the NFC .
While all of the former AFL teams along with the NFL 's Cleveland Browns , Pittsburgh Steelers , and Baltimore Colts made up the American Football Conference ( AFC ) , the other 13 NFL teams formed the NFC .