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A common complaint with Automatic transmissions.
Normal operation while idling in drive.
Depends on many factors, especially the slope of the hill.
You need to apply the brake to hold the vehicle stationary, then apply the accelerator pedal when you want to move forward again.
I hope my advice has been of assistance to you.
Have you ever noticed that ALL autos will roll backwards while idling on diffferent slopes?
All autos have torque convertor slip at idle.
If there is no other abnormality, I would say some driving will relearn the engine ECM and the idle may be more correct.
Hope this all makes sense for you.