Which customers do not have any policies? Find the details of these customers.
SELECT customer_details FROM Customers EXCEPT SELECT T1.customer_details FROM Customers AS T1 JOIN Customer_Policies AS T2 ON T1.customer_id  =  T2.customer_id
SELECT customer_details FROM Customers EXCEPT SELECT T1.customer_details FROM Customers AS T1 JOIN Customer_Policies AS T2 ON T1.customer_id  =  T2.customer_id
[{'Customer_Details': 'Augustine Kerluke'}, {'Customer_Details': 'Buddy Marquardt'}, {'Customer_Details': 'Miss Felicita Reichel'}, {'Customer_Details': 'Mrs. Lilly Graham III'}]