Agence France-Presse: BP has billed a subsidiary of Japanese trading house Mitsui and Co. up to 1.9 billion dollars for costs from the Gulf of Mexico oil spill, the Japanese company said Tuesday, adding it would withhold payment. The Japanese firm said MOEX Offshore, wholly owned by a US unit of Mitsui Oil Exploration Co., had withheld payment amid uncertainty “as to how to calculate the total claimed amount”. It said it had not paid given “ongoing investigations to determine the facts and circumstances surrounding…