Segment Reporting - Condensed Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total assets	$ 26,036	$ 25,775
Total liabilities	22,914	22,437
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Total assets	6,496	6,046
Total liabilities	11,416	11,267
Operating Segments | Las Vegas, NV [Member]
Segment Reporting Information [Line Items]
Total assets	13,978	13,987
Total liabilities	5,771	5,730
Operating Segments | Other U.S.
Segment Reporting Information [Line Items]
Total assets	8,690	8,565
Total liabilities	5,735	5,143
Intersegment Elimination
Segment Reporting Information [Line Items]
Total assets	(3,128)	(2,823)
Total liabilities	$ (8)	$ 297