Easy come, easy go. What seemed like a billion dollar bank mistake was actually no mistake at all.

A woman from Largo, Florida, says she was stunned over the weekend when she tried to withdraw $20 from a Chase Bank ATM.

The balance showed nearly $1 billion in the account, but the ATM wouldn't let her withdraw any money from that account.

Chase Bank now says the balance was actually a negative number used to freeze the account, which the woman shared with her recently deceased husband.

Chase Bank said people are required to turn in proper documentation in a situation like this to avoid a freeze on a joint bank account.