Given his remarkable track record of compounding capital for multiple decades at Berkshire Hathaway, it's not surprising that individual investors like to look at the Warren Buffett conglomerate's enormous portfolio to find winning stock ideas. Even small positions can be worthwhile investment candidates.

Among the dozens of Berkshire holdings, investors might want to take a closer look at Visa (NYSE: V) and Mastercard (NYSE: MA). Together, they make up just 1.1% of its portfolio. But that doesn't mean they don't have sizable upside.

In fact, these two financial stocks could turn $100,000 into $1 million over the next 20 years.

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Source Fool.com