Indonesia's foreign exchange reserves fell by $1 billion to $100.7 billion in October, the country's central bank said in a statement Friday. Bank Indonesia also said that it partially used the reserves for currency intervention in the month. From September 30 to October 30, the Indonesian rupiah rose 7 percent against the dollar. Southeast Asia's largest economy lost $14.8 billion in reserves from February to October largely to defend a fragile currency against global uncertainty.