I like to start stopping WAY before the slippery condition so by the time I get there, I've already slowed down and have control.
I have no troubles with ice as long as no other moving objects like other cars are around.
To test if its too icy to use the breaks tap on them and if its icy the car will immediate slide for that short period.
In that case take your feet off gas and let the car naturally slow while you have control of the steering.
Slamming the breaks on ice is near suicide.
Auto-braking system recently caused a serious injury accident in the professional cycling world. The lead vehicle suddenly slammed on the brakes, causing the entire group of leading , to go down. Some slammed into the back of the vehicle and suffered broken bones and internal injuries.