TheStreet's Jim Cramer says Exxon didn't give investors the upside when oil was booming but it doesn't have that terrible downside when oil is no good. He explains that the reason Exxon can withstand the volatility in the oil market is because the company has a 50-year plan. That allows them to have a day where it says we don't think oil is coming back up, we're very worried about the near-term of oil, we don't think it's going to have a rally -- and nobody cares and sells Exxon stock. Exxon has a great balance sheet unlike Enterra and Encana both of which had to do an equity offering. That's why Cramer says Exxon is a great long term hold.