US President Barack Obama has signed a bipartisan federal budget Bill, averting the risk of an embarrassing government shutdown for two years in the world's largest economy. Obama also approved a defense spending Bill that includes provisions altering the way sexual assaults are handled in the military. The measure also makes it easier to transfer detainees out of the Guantanamo Bay detention facility in Cuba.The hard-fought legislation was passed by both the Senate and the House of Representatives earlier this month. The Bill had been drafted by a cross-party budget committee set up after October's 16-day government shutdown. It outlines federal spending through 2015, meaning the government will remain open for the foreseeable future. A government shutdown at the beginning of October cost the US government millions of dollars, and left a large swath of the federal workers at home.