We were driving on highway at 120 kmh. The road was smooth and we had no error/service dash lights illuminated. Suddenly we heard a loud bang and we lost total control of the vehicle. We (hit) slid onlong the concrete highway which prevented the car from flipping and entering oncoming traffic. Our terrifying experience lasted about 8 seconds until we came to a stop. We were fortunate that we were not crashed into by nearby traffic. The original manufacturer alloy rear left wheel shattered. I have pictures of the wheel. The wheel totally separated from the hub. The tire was in good condition and we didn't hit any bumps or pothole. I notified KIA about this issue with reference # [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)