shopify-cart-total-save.liquid

{% assign cart_com_total_price = 0 %}
{% for line_item in cart.items %}
  {% if line_item.product.compare_at_price %}
    {% assign com_price = line_item.product.compare_at_price | times: line_item.quantity %}
    {% assign cart_com_total_price = cart_com_total_price | plus: com_price %}
  {% else %}
    {% assign cart_com_total_price = cart_com_total_price | plus: line_item.final_price %}
  {% endif %}
{% endfor %}

{% if cart_com_total_price > cart.total_price %}
  {% assign total_price_diff = cart.total_price | minus: cart_com_total_price %}
  <div>
    <span style="color:green;">Savings</span>
    <span style="color:green;">{{ total_price_diff | money }}</span>
  </div>
{% endif %}