Do I need VISA to transit if my layover is 20 hrs at shanghai,An Indian citizen returning India

My flight from Chicago (China eastern Airline) will land at Shanghai at 8 PM and my next connection to my final destination Delhi (China Eastern airline) is at 2.30 PM next day from Shanghai. I am an Indian citizen returning to India. Am I eligible for 24hr transit as I want to stay in some city hotels outside the airport?
Can my airline (China eastern) deny me to board me at Chicago as I don't have the transit G type for china, although I have printed tickets for the onward journey ( also by China eastern at the same terminal, change of terminal at Shanghai is not required) to India within 24h?