How to fix Device Idle and Cell Standby in Samsung s6

A

AC Question

Before i sleep i leave my phone charged till 100% after 8 hours i realize that my phone lost 3 % of its battery, in battery usage there are Device idle and standby battery usage.

I tried few solutions which are posted in different websites and some videos youtube, but it didn't help me.

Can someone please give an accurate answer with 100% solution?

Thank You