American International Group Inc. agreed to pay $9.8 billion to Warren Buffett’s Berkshire Hathaway Inc. to take on long-term risks from commercial policies written in prior years. The reinsurance deal covers 80 percent of the risks on certain U.S. policies from 2015 and earlier, representing reserves of about $34 billion as of Jan. 1, 2016, New York-based AIG said Friday in a statement.