Exxon Mobil Corp. more than doubled the budget cuts announced by any other shale company last week. In all, nearly three dozen shale drillers have slashed more than $27 billion from their budgets in less than a month. Exxon, alone, said it would cut $10 billion in spending, a 30 percent reduction. ExxonMobil saw its credit rating downgraded by Moody's on Thursday from Aaa to Aa1, with a Negative outlook.