LOS ANGELES — The Coen brothers have completed their journey from the fringes to Hollywood’s mainstream, winning four Academy Awards for “No Country for Old Men,” including best picture.

Javier Bardem won for supporting actor in “No Country,” which earned Joel and Ethan Coen the best-picture honor as producers, best director, and adapted screenplay.

Accepting the directing honor alongside his brother, Joel Coen recalled how they were making films since childhood, including one at the Minneapolis airport called “Henry Kissinger: Man on the Go.”

“What we do now doesn’t feel that much different from what we were doing then,” Joel Coen said. “We’re very thankful to all of you out there for continuing to let us play in our corner of the sandbox.”

Daniel Day-Lewis won his second best-actor Academy Award for the oil-boom epic “There Will Be Blood,” while “La Vie En Rose” star Marion Cotillard was a surprise winner for best actress, riding the spirit of Edith Piaf to Oscar triumph over Julie Christie, who had been expected to win for “Away From Her.”

While the quirky American Coens led the night, the Oscars had a strong international flavor, with all four acting prizes went to Europeans: Frenchwoman Ms. Cotillard, Spaniard Mr. Bardem, and Britons Mr. Day-Lewis and Tilda Swinton, the supporting-actress winner for “Michael Clayton.”