On top of your Multi-Policy discount, some insurers, like Esurance, give you a single deductible for both policies. Here's how that helps you save:
A deductible is the amount you pay out of pocket before coverage steps in. If your home is insured with one company while your car's insured with another, you'll likely have a deductible for each policy.
Now, say you've insured both your home and car with Esurance. You only have one deductible for a claim involving both your home and auto. So if you ever back into the fence with your car — you'd only need to file one claim and pay one deductible to get both the car and the fence repaired.