Jakarta - Beijing - USA

Your right is to remain airside and to wait for your onward flight to US. However, if you want to exit the airport for the purpose of staying in a hotel, you will approach 24/144 hour visa free transit counter immediately upon your landing in Beijing. Here you will apply, for free, for a temporary entry permit to be allowed to exit the airport. You will present your flight tickets and your hotel accommodation confirmation in a hope that a temporary entry permit will be granted to you. You have to be aware that this permit is not a passenger's right, but more as a bonus that can be granted to those with long layovers. In your case, you have a very good chance to be granted a permit especially since your accommodation is associated with your flight itinerary, but also the permit can be denied without any explanation. If I were you I would definitely try to obtain a permit and if not successful, you will stay airside... There is no other alternative.

Just to repeat, this is not 24 hour free visa, but a temporary entry permit that is granted to those traveling on 24 hour visa free transit.