Having multiple promotions (or discounts) applied for shopping carts, how to get such promotions so I can display them in view?

Update: I want to get each. NOT the total. This is so I can display the labels of each promotions/discounts for the cart. Such as:

Sub Total: 100.00
Discounts:
   First Purchase: -10 (10%),
   Employee Discount: 5 (5%)
Shipping Fee: 20.00
Grand Total: 105