Segment Reporting - Condensed Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total assets	$ 26,136	$ 25,775
Total liabilities	23,328	22,437
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Total assets	6,548	6,046
Total liabilities	11,747	11,267
Operating Segments | Las Vegas, NV [Member]
Segment Reporting Information [Line Items]
Total assets	14,051	13,987
Total liabilities	5,842	5,730
Operating Segments | Other U.S.
Segment Reporting Information [Line Items]
Total assets	8,666	8,565
Total liabilities	5,748	5,143
Intersegment Elimination
Segment Reporting Information [Line Items]
Total assets	(3,129)	(2,823)
Total liabilities	$ (9)	$ 297