magento2 – How to get Order from Order/Interceptor

Im in a custom controller tying to get the order info with checkout session. There is my code.

    $order = $this->_checkoutSession->getLastRealOrder(); // MagentoSalesModelOrderInterceptor
    $orderId = $order->getEntityId(); // null
    $orderIncrementId = $order->getIncrementId(); // null 

But actually Im getting null on $orderId and $orderIncrementId.