fionashanahan, If really stuck, give a touch of penetrate oil down the jaws of the chuck, put the drill in reverse, firmly grip the chuck with gloved hand and gently squeeze the trigger up the point that you cannot hold on. If it still doesn't budge and you're not able to hold the chuck against - Ryobi P202
Ryobi P202 Repair - iFixit
Ryobi P202 Repair - iFixit
SOLVED: How to get stuck bit out of ryobi drill - Ryobi
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I found EASIEST WAY to REMOVE STUCK BIT in keyless chuck to NOT DAMAGE chuck