Sumber:
http://womepo.b1.jcink.com/index.php?showtopic=330
"Million" is "juta".
1.000.000 = satu juta ("sejuta" is okay, but is rarely used in formal speaking).
2.500.000 = dua juta lima ratus ribu
"Billion" is "milyar":
1.000.000.000 = satu milyar
2.000.000.000 (the highest price in Deal or No Deal Indonesia) = dua milyar
After "milyar", we have "triliun" to mention 1.000.000.000.000 (12 zeroes), then we follow the short scale for large numbers (you can see it here:
http://en.wikipedia.org/wiki/Names_of_large_numbers) with adapted writing. The highest number Indonesian can talk about is "kuadriliun" for 1.000.000.000.000.000, but since it's unpopular (and it's a very rare case to mention that huge amount), we usually call it "seribu triliun".