There werebillionsofflieseverywhere.
Billions ofadslike these arepostedon theInternet.
Youknowthatroad- we'vedrivendown it abilliontimes!
There arebillionsofplasticbagsin thecupboardunder thesink.
You've got abillionpens- you don't need any more!
I've madebillionsofcakeslike this over theyears.