Access the 2017 Form 10-Ks for General Motors, Inc. and Berkshire Hathaway. What was the impact of the Tax Cuts and Jobs Act on their income tax provision for 2017? Why was the impact in opposite directions (i.e., in one case the provision increased and in the other it decreased)?

To access the Form 10-Ks, go to sec.gov. Input the company's name under "Search EDGAR. You will find the detailed financial statements in each company's 10-K, a filing required by the SEC.