McLean,VA-Based Hotel Co Hilton Worldwide Holdings 4Q 2017 Pretax Income Increased 55% Over the 4Q 2016 ....................................................................................... $665 Mil or 79% of Hilton's $841 Mil of Net Income in the 4Q 2017 Came From an Income Tax Benefit of $665 Mil Resulting Primarily From the Puzzling, Very Lucrative US Federal Income Tax Debt Forgiveness Feature in the US Trump Tax Cuts Act