Does IBKR or Schwab provide interest on cash set aside as option collateral after writing options?

Currently on Fidelity I generate interest on all uninvested cash, regardless of whether it is being used as margin for some option positions or not. Even the cash generated from writing an option will be generating interest on the account. This can add up over the months to be a nice little boost in annual % return of the portfolio. I've heard this is something Fidelity is praised for, so curious if other brokers like IBKR or Schwab also do this?