No money left the bank, but the "inputting error" came amid CEO Jane Fraser's efforts to convince regulators she's fixing the bank's controls.

Citigroup Inc. erroneously credited $81 trillion to a customer’s account instead of $280 last April before reversing the transaction hours later, according to the Financial Times. The bank called it a "near miss.

In a surprising turn of events, one of the largest banks in the world, Citigroup, made a massive financial mistake. Instead of sending a small payment of $280, an employee accidentally credited a staggering $81 trillion to a customer’s account.