Given a yes-no question such as:
Did you call him?
Is it idiomatic to simply answer:
Yes. / No.
As opposed to:
Yes, I did. / No, I didn't.
I did. / I didn't.
I've noticed that in some languages simply answering yes or no seems to be the common unmarked way of answering (e.g. Spanish), but not in others (e.g. Portuguese).