As part of the "Hot Line" with teammates Bobby Hull and Ulf Nilsson that played from 1974 to 1978, Hedberg won two Avco World Trophies as WHA champions with the Winnipeg Jets.

[4] At the time the Toronto Maple Leafs of the National Hockey League owned Hedberg's NHL rights, but by going to the WHA there was no compensation required.

[4] Hedberg was an instant sensation in the WHA, recording 100 points in 65 games in his first season, and playing alongside established superstar Bobby Hull.

After his active career, Hedberg became an assistant to general manager Craig Patrick of the New York Rangers, the first European to have a front office job in the NHL.

In 2000, he was appointed general manager of the Swedish national ice hockey team, later serving with the Ottawa Senators as Director of Player Personnel from 2002 to 2007.