Imagine you're analyzing the tax implications of a recent merger between Pfizer Inc. and Johnson & Johnson. Pfizer reported a net income of $10 billion for the fiscal year ending December 31, 2023, while Johnson & Johnson reported $15 billion. Calculate the potential tax liability for each company post-merger, considering the corporate tax rate of 21%. Additionally, estimate the tax savings from any available deductions related to merger expenses, which are projected to be $500 million, and identify strategies to minimize the combined tax burden.