Collision coverage is generally sold with a separate deductible. Even if you are at fault for the accident, your collision coverage will reimburse you for the costs of repairing your car, minus the deductible. If you're not at fault, your insurance company may try to recover the amount they paid you from the other driver’s insurance company and, if they are successful, you'll also be reimbursed for the deductible.
In the U.S., there are only two states where you’re not legally required to carry auto insurance: New Hampshire and Virginia. This, however, doesn’t mean you shouldn’t buy a policy if you live there. Additionally, this means that if you do not have auto insurance in Illinois, you’re not only risking financial trouble but you may also face legal consequences.