Warren Buffett’s Berkshire Hathaway Inc. is nearing a deal to acquire Occidental Petroleum Corp.’s petrochemical business for about $10 billion, according to a person familiar with the matter. It would be Berkshire’s largest deal since its acquisition of Alleghany Corp. in 2022 for $13.7 billion, according to data compiled by Bloomberg. Representatives for Occidental and Berkshire didn’t immediately reply to messages seeking comment. Still, the conglomerate’s cash pile totaled $344 billion at the end of June, close to a record. Occidental, which is backed by Berkshire, has announced almost $4 billion of asset sales since the start of last year as it works to pay down debt.