Shopify - Show total savings on cart page

gistfile1.txt

{% assign total_saving = 0 %}
{% for item in cart.items %}
{% if item.variant.compare_at_price > item.variant.price %}
{% capture saving %}{{ item.variant.compare_at_price | minus: item.variant.price }}{% endcapture %}
{% assign total_saving = saving | plus: total_saving %}
{% endif %} 
...rest of cart code within for loop
{% endfor %}

Display saving:

Saving - {{ total_saving | money }}

add to cart.liquid to displage compare_at_price on the cart page.

{% if item.product.compare_at_price > item.price %}<s>{{ item.product.compare_at_price | money }}</s>{% endif %}
{{ item.price | money }}