Suppose Caterpillar, Inc., has 655 million shares outstanding with a share price of $ 72.06 comma and $ 25.67 billion in debt. If in three years, Caterpillar has 702 million shares outstanding trading for $ 86.98 per share, how much debt will Caterpillar have if it maintains a constant debt-equity ratio? The amount of debt required in three years will be $____ billion.(Round to two decimal places.)