The destruction caused by the Los Angeles-area wildfires, possibly the worst ever in California, is almost certain to rank as one of the most costly natural disasters in U.S. history, with the total economic toll well into the tens of billions of dollars. Experts at Moody’s also said that they expected the insured losses stemming from the L.A. County fires to run in the billions of dollars given the high value of properties in coastal Pacific Palisades, where the first blazes broke out on Tuesday.