SINGAPORE (Reuters) - Asian stock markets made a cautious start on Thursday following two days of rallies, as investors await the passage and details of a $2 trillion stimulus package in the United States to combat the economic fallout from the coronavirus. Senate leaders hope to vote on the plan later on Wednesday in Washington, but it still faces criticism. The bill includes a $500 billion fund to help hard-hit industries and a comparable amount for payments up to $3,000 to millions of U.S. families.