Berkshire Hathaway Inc. is approaching a significant $10 billion deal to acquire Occidental Petroleum Corp.'s petrochemical business, which would be its largest acquisition since the $13.7 billion purchase of Alleghany Corp. This move comes as Occidental announces nearly $4 billion in asset sales and is projected to achieve a pretax income of $800 million to $900 million from its OxyChem division this year. Concurrently, markets anticipate a potential 25 basis point rate cut by the Federal Reserve, reflecting a cautious economic outlook amid mixed employment indicators.