債務
account collectible // debit and credit // debt // debt owing // encumbrance《法律》〔不動産に付帯する〕 // indebtedness // liability for a debt // liability〔通例liabilities◆【用法】単数扱い〕 // obligation // obligatory duty // passive debt

Source: www.alc.co.jp

If an account has a debit balance then it owes money (to someone) because more money has been paid into it than has been drawn out...

Source: http://en.wikipedia.org/wiki/Debits_and_credits

Considering the above, I think you can simply call this debit balance amount or debit balance...Although literal translation could be liability of a debit balance account, it is obvious that if an account has a debit balance then it owes money (to someone), which is nothing but a liabiliity on your balance sheet...Therefore I think literal translation would be superfluous here..

The following document gives a good overview of basic accounting procedures...

www.textbooksonline.tn.nic.in/Books/11/Acct-EM/ 1 Accountan...

Debit Balance Liability

These one-line descriptions alone often appear as sub-sections of a broader classification in formal accounts (eg. B/S). The broader classification (eg. asset/liability class) gives the context.