# File lib/fog/aws/models/elb/load_balancer.rb, line 46
        def deregister_instances(instances)
          requires :id
          data = connection.deregister_instances_from_load_balancer(instances, id).body['DeregisterInstancesFromLoadBalancerResult']
          data['Instances'].map!{|h| h['InstanceId']}
          merge_attributes(data)
        end