Best unique ID type for huge amounts of data

[Greg Knox]

I'm looking to create a table that can store billions upon billions of records.

I've read that if I use an INT as the unique ID then I'm limited to the max value of an INT for my records. If this is true, what's the best option for storing unique IDs that will allow for massive amounts of data?

Would storing the IDs as GUID be a possibility or are there other types that are more efficient?

Thanks!