"A billion dollars isn't cool. You know what is? A billion dollars."
Historically, in the UK, Australia, and other countries, "one billion" meant "one million million" (i.e. 1,000,000,000,000). Officially, at least in the UK, it now means the same as the US (i.e. 1,000,000,000)
Note that 'billion' and 'trillion' themselves have multiple meanings [1] [2], even though most people use only the short scale.