The film is presented on DVD in Academy Ratio (1.37:1). And, no, it is not a Pan and Scan cut. Kubrick preferred to film on full frame 35mm. Widescreen cinema presentations were made by masking the tops and bottoms of the frames. On the DVD, you see the whole of the picture as recorded on the negative.
The quality of this transfer is extraordinary. The detail is immaculate, convincing. The colours are rich and Kubrick's framing and photography most likely cannot be surpassed.