Casino Promotional Allowances (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Promotional Allowances	$ 138	$ 131	$ 411	$ 403
Cost of Promotional Allowances	67	65	202	197
Food and beverage
Promotional Allowances	68	66	206	207
Cost of Promotional Allowances	41	40	125	124
Rooms
Promotional Allowances	60	57	178	174
Cost of Promotional Allowances	20	20	61	60
Other
Promotional Allowances	10	8	27	22
Cost of Promotional Allowances	$ 6	$ 5	$ 16	$ 13