The Frenchman completed the tough, icy course at the most prestigious stop on the men's World Cup circuit in 1 minute, 38.88 seconds.
Reinfried Herbst of Austria was 0.36 seconds behind in second place -- his first career podium -- while overall World Cup leader Benjamin Raich was 0.50 back in third.
"It's simply fantastic," Vidal said. "All of us are pretty good, at a similar level, so it is not easy to win. All the other guys also know what they are doing."
Vidal fell to the ground after crossing the line and seeing his time flashing on the big screen. Other skiers and course stewards helped him back up.
Raich's total time secured him the combined title, which is calculated by adding the results of the slalom with Saturday's downhill.
Reigning overall champion Bode Miller finished 18th but his downhill performance earned him second place in the combined. Aksel Lund Svindal of Norway was third.
"It was very hard, a very tough race," Miller said. "It was very bumpy, especially in the second run."
Miller, who did not finish Friday's super-G but was fifth in Saturday's downhill, said he was content with his second place.
"It was an OK weekend. It wasn't a `Bode' weekend, but it was OK," Miller said. "Benny [Raich] is simply too strong these days, so I could not catch up."
Ryan Blais won a postponed World Cup aerials competition on Sunday, but it wasn't enough to put him on the Canadian Olympic Team.
His roommate, Jeff Bean, finished second and clinched the last Olympic berth.
Blais received 128.10 points for his jump. Bean, who needed to finish fourth or better, scored 124.34 points.
American Jeret Peterson, the defending World Cup champion, finished third with 123.48.
"We want to send the strongest team to Torino next month and I think we're doing that," Blais said. "I won tonight and I'm not even going, so how strong are we?"
Hannu Manninen of Finland won his ninth World Cup Nordic combined event this season on Sunday.
Manninen, 12th after the ski jump, dominated the 15km cross-country race and won in 39 minutes, 57.7 seconds. Bjoern Kirchreisen of Germany, fourth after the ski jump, was 47.1 seconds behind in second place.
Germany's Georg Hettich, who was second in the ski jump, finished third, 1 minute, 20.6 seconds behind Manninen.
Manninen, a favorite for next month's Winter Olympics, leads the overall standings with 1,064 points, followed by Ronny Ackermann of Germany with 501 points. Norway's Moan Magnus is third with 480 points.
Odd-Bjorn Hjelmeset and fellow Norwegian Ella Gjoemle won sprint races on Sunday at a World Cup event.
Hjelmeset won the four-man in a 1.2km classic race in 2 minutes, 29.9 seconds. He edged countryman Johan Kjolstad by 1.1 seconds.
American Todd Hays edged Canada's Pierre Lueders by 0.04 of a second on Sunday in an four-man bobsled World Cup race.
Germany's Andre Lange, Rene Hoppe, Kevin Kuske and Martin Putze took silver with 2:10.82. Russia's Alexander Zubkov, Sergej Golubjev, Alexej Seliverstov and Dimitri Stepuschkin took bronze with 2:10.89.
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