(You don’t have non-drivers in the US?)

A non-driver would get a state issued ID card which contains all the same personally identifying information but instead of being both a license to drive and proof of ID it is just proof of ID. The ubiquity of driving here leads a lot of people to use "driver's license" when they mean "state issued picture ID" since it is a form of state issued picture ID so many have but it is not the only one available.