The maximum size of currency fields can be between -922,337,203,685,477.0000 and 922,337,203,685,477.0000 - but this is limited by the min/max you provide on an attribute by attribute basis.
The default range for a currency field is 0.0000 to 1,000,000,000,000.0000 not 1,000,000,000.0000 - so it might be worth going back and checking those commas!
hth
Scott Durow
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