Polite everyday word for paper money, commonly used in spoken and written Japanese. The honorific prefix お makes it sound natural and respectful.
There isn't a single bill in my wallet.
Could you break this bill for me?
I paid for the taxi fare with bills.
I got the convenience store to break my ten-thousand-yen bill.
There were three thousand-yen bills in my wallet.
The bank teller counted the bills with practiced hands.