Segment Reporting - Condensed Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total assets	$ 25,512	$ 14,923
Total liabilities	22,216	16,532
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Total assets	7,519	7,896
Total liabilities	11,843	15,599
Operating Segments [Member] | Las Vegas, NV [Member]
Segment Reporting Information [Line Items]
Total assets	14,145	8,583
Total liabilities	5,238	456
Operating Segments [Member] | Other U.S. [Member]
Segment Reporting Information [Line Items]
Total assets	6,880	1,580
Total liabilities	5,027	477
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total assets	(3,032)	(3,136)
Total liabilities	$ 108	$ 0