[Breq nods, immediately realises her mistake and says aloud;]

Yes. A billion who-knows-what, for who-knows-knows-why.

[She hadn't had a chance to inquire further about the details of that bill, can't imagine it's just for the board and wrong-tasting food. Although a billion-something could be a very small or very large amount, depending on what that something was.]

I imagine they'll be eager to let us know exactly what it is we owe them, if they expect to ever see it.