keywords: bhp commodity billiton doubled doubles
text: BHP Billiton 2nd-Half Net Doubles on Commodity Prices (Update3) Aug. 18 (Bloomberg) -- BHP Billiton, the world #39;s biggest mining company, more than doubled second-half profit as Chinese demand boosted commodity prices and said it may return as much as \$2 billion to investors, including through share buybacks. 