It's been almost two decades since the Exxon Valdez dumped 11 million gallons of crude oil into Prince William Sound, Alaska. In the intervening years, the spill has become synonymous with corporate negligence and failed stewardship. It stands as one of the worst environmental disasters in history.

As we near the special day, don't feel like you have to bake a cake for Exxon. The U.S. Supreme Court has already beaten you to the punch.

In the original judgment on the case, which came five years after the actual spill, an Anchorage jury awarded the plaintiffs $287 million in actual damages and $5 billion in punitive damages. At the time, the punitive judgment was equal to one year's profits for the company. Predictably, Exxon repeatedly appealed the judgment, which was reduced to $4 billion, then increased to $4.5 billion, then reduced to $2.5 billion. Last week, the Supreme Court (minus justice Alito, who owns over $100,000 worth of Exxon stock, and recused himself from the case), ruled on the original judgment. In a 5-3 decision, the Supremes determined that the damages were excessive in light of maritime law and ruled that Exxon owes $507 million. With interest, that would come to roughly $1 billion, but it seems likely that Exxon will appeal the interest.

The $507 million represents approximately $15,000 each for the 34,000 fishermen who have had their livelihoods ruined by Exxon. It also represents approximately one week's profits for the company. For a ruling that is supposed to punish Exxon's corporate mistakes -- errors that the Supremes themselves called "more than negligent, but less than malicious" -- this seems like a joke. However, with extremely deep pockets and an apparent willingness to litigate until the end of eternity, I can't help but wonder if Exxon is done. Given a little more time and a consistently tractable Supreme Court, is it hard to imagine a day in which Exxon demands payment for the high-octane shoreline that it so generously donated to Alaska?