Australia's supermarkets, banks and miners have again made up the local entries on the list of the world's largest 500 corporations. The Forbes Fortune Global 500 has ranked miner BHP Billiton as Australia's largest and the world's 168th largest company, based on revenue. It slipped from 139th largest last year.Australia's supermarket giants aren't too far behind, with Coles' owner Wesfarmers steady at 171 and Woolworths raising five spots to 176.They are followed by the big four banks, Commonwealth (269), NAB (304), Westpac (336) and ANZ (362).Telstra is the last Australian company ranked at number 482. There were no new Australian additions to the list from last year. Australian-British mining giant Rio Tinto, which Forbes has listed as British, is ranked at number 296.The list uses reported revenue in the financial year ending before   March 2016 and uses US dollars. It has produced different results to other rankings of Australia's biggest companies.An IBISWorld report released earlier this year, for example, ranked the supermarkets at number one and two, followed by Rio Tinto, BHP Billiton and then the banks.American retail giant Walmart again topped the worldwide list with revenue of $US482.1 billion ($642.5 billion), followed by Chinese n ational energy companies State Grid, China National Petroleum and Sinopec Group.They were joined in the top 10 by oil giants Royal Dutch Shell, Exxon Mobil and BP and car makers Toyota Motor and Volkswagen.Apple, the manufacturer of the iPhone, cracked into the global top 10 list for the first time at number nine.Forbes says the total revenue from the top 500 companies fell 11.5 per cent to $US27.6 trillion ($36.8 trillion) from last year as the US dollar surged, China's economy slowed and the global oil price collapsed dramatically.