Warren Buffett is arguably one of the best investors of all time. He's created fortunes for Berkshire Hathaway shareholders during the more than five decades he's overseen the conglomerate's investments. And he continues to find new ways to grow his fellow shareowners' wealth.

Unsurprisingly, investors pay close attention to the moves Buffett and his team make in Berkshire's massive $345 billion stock portfolio. Here are two of Buffett's biggest bets in the stock market -- both of which are still attractive buys today.

Geopolitical turmoil in the Middle East and Europe makes clear the crucial need for reliable sources of affordable energy. CEO Vicki Hollub is positioning Occidental Petroleum (NYSE: OXY) to help meet the global demand for dependable energy -- specifically, in the form of oil and natural gas -- for decades to come.

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Source Fool.com