Rex Tillerson, President-elect Donald Trump’s pick for U.S. secretary of state, disclosed assets worth as much as $400 million in a federal ethics filing that reflected investments spanning more than a dozen nations. If confirmed by the U.S. Senate, Tillerson will recuse himself for a year from government decisions involving Exxon Mobil Corp., where he served as chairman and chief executive officer until Jan. 1, according to a separate filing posted by the Office of Government Ethics on Wednesday.