I feel I should know the answer but I am seeing conflicting information.

If I book a flight with Airline A using Expedia and need to cancel. Do I maintain flight credit with Expedia and can use that credit to book a flight on Expedia with Airline B? Or does it stay as a credit for Airline A?

I am considering a flight on a carrier I am unlikely to book again for years. It needs to be a non-refundable ticket (for reimbursement), so ability to transfer to a different airline, just in case, would be preferable.

TIA