Warren Buffett isn't shy about making big bets. Within Berkshire Hathaway's portfolio of publicly traded stocks, just 10 positions comprise more than 90% of its invested capital.

One of those positions is Occidental Petroleum (NYSE: OXY). Buffett and Berkshire are betting on this company in a far greater way than most investors realize.

According to the most recent filings, Berkshire's publicly traded portfolio is worth around $350 billion. It's important to note that this is just a piece of Berkshire's total asset base. It has, for example, complete ownership over dozens of additional businesses whose value is not included in this figure. Still, this $350 billion portfolio is a great way to see what Buffett and his investment team are backing.

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Source Fool.com