Casino Promotional Allowances (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Promotional Allowances	$ 679	$ 538	$ 563
Cost of Promotional Allowances	351	269	269
Food and beverage
Promotional Allowances	347	277	281
Cost of Promotional Allowances	223	170	169
Rooms
Promotional Allowances	285	234	234
Cost of Promotional Allowances	100	82	83
Other
Promotional Allowances	47	27	48
Cost of Promotional Allowances	$ 28	$ 17	$ 17