Warren Buffett has cemented his position as a financial legend over his long investing career. Since he assumed the role of Chief Executive Officer at Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B), Buffett has delivered incredible returns of 3,787,464% -- or nearly 20% compounded annually. Buffett's success can be attributed to a few factors, including his astute investment strategy and surrounding himself with intelligent individuals like longtime partner Charlie Munger.

Another crucial aspect of Berkshire Hathaway's approach is its ability to generate consistent cash flows, providing Buffett and his team with a reliable source of capital. This financial strength allows him to hold investment positions for a long time while always having cash available to take advantage of discounted stock prices.

Remarkably, one key metric under Buffett's leadership has grown 863,732% since he took over at Berkshire Hathaway. Here's what that crucial metric is and why it makes Berkshire Hathaway a money-making machine.

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Source Fool.com