Segment Reporting - Condensed Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total assets	$ 25,475	$ 25,775
Total liabilities	23,008	22,437
Operating Segments | Las Vegas
Segment Reporting Information [Line Items]
Total assets	13,567	13,987
Total liabilities	5,799	5,730
Operating Segments | Other U.S.
Segment Reporting Information [Line Items]
Total assets	8,627	8,565
Total liabilities	5,785	5,143
Operating Segments | All Other
Segment Reporting Information [Line Items]
Total assets	6,411	6,046
Total liabilities	11,434	11,267
Elimination
Segment Reporting Information [Line Items]
Total assets	(3,130)	(2,823)
Total liabilities	$ (10)	$ 297