By a 5-3 vote, the high court ruled that the punitive damages award should be slashed -- limited by the circumstances of the case to an amount equal to the total relevant compensatory damages of $507.5 million.

The justices overturned a ruling by a U.S. Court of Appeals that had awarded the record punitive damages to about 32,000 commercial fishermen, Alaska natives, property owners and others harmed by the nation's worst tanker spill.

In the majority opinion, Justice David Souter concluded the $2.5 billion in punitive damages was excessive under federal maritime law, and should be cut to the amount of actual harm.

Soaring oil prices have propelled Exxon Mobil to previously unforeseen levels of profitability in recent years; the company posted earnings of $40.6 billion in 2007.

It took Exxon Mobil just under two days to bring in $2.5 billion in revenue during the first quarter of 2007.

The Exxon Valdez supertanker ran aground in Alaska's Prince William Sound in March 1989, spilling about 11 million gallons of crude oil.

The spill spread oil to more than 1,200 miles of coastline, closed fisheries and killed thousands of marine mammals and hundreds of thousands of sea birds.

A federal jury in Alaska awarded $5 billion in punitive damages in 1994. A federal judge later reduced the punitive damages to $4.5 billion, and the appeals court further cut it to $2.5 billion.

Exxon Mobil, the largest U.S. company by market capitalization, then appealed to the Supreme Court, arguing it already had paid more than $3.5 billion for the spill.

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