Casino Promotional Allowances Casino Promotional Allowance Estimated Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Cost of Promotional Allowances	$ 66	$ 168	$ 132	$ 337
Food and Beverage [Member]
Cost of Promotional Allowances	42	114	84	228
Rooms [Member]
Cost of Promotional Allowances	20	40	40	81
Other Promotional Allowances [Member]
Cost of Promotional Allowances	$ 4	$ 14	$ 8	$ 28