如何回滚已更改的列

I want to produce the below SQL query,

ALTER TABLE `api`.`users` CHANGE COLUMN `id` `id` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT ;

in Laravel 5 another abstract layer was introduced, change, after that you can code like this,

public function up()
{
    Schema::table('users', function (Blueprint $table) {
        //DB::statement("ALTER TABLE `api`.`users`
        //    CHANGE COLUMN `id` `id` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT ;");
        $table->increments('id')->unsigned()->change();
    });
}

What is the way to undo the change, how should I write my down()?

Unsuccessfully I tried the following.

public function down()
{
    //DB::statement("ALTER TABLE `api`.`users`
    //    CHANGE COLUMN `id` `id` INT(11) NOT NULL AUTO_INCREMENT ;");
    $table->increments('id')->change();
}

--- Edit ---

I'm working with an existing table with live data (in fact a replica in my local environment). So I'm afraid perhaps dropping a column is not my option.

You can drop the column and re-add it. Because it's auto incrementing all the existing rows should keep the same ID.

public function down()
{
    $table->dropColumn('id');
    $table->increments('id');
}

But don't forget, using increments will automatically add unsigned for you and all of your keys should be unsigned, including any foreign key columns.