Segment Reporting - Condensed Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total assets	$ 25,775	$ 25,436
Total liabilities	22,437	22,139
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Total assets	6,046	7,458
Total liabilities	11,267	11,780
Operating Segments [Member] | Las Vegas, NV [Member]
Segment Reporting Information [Line Items]
Total assets	13,987	14,145
Total liabilities	5,730	5,239
Operating Segments [Member] | Other U.S. [Member]
Segment Reporting Information [Line Items]
Total assets	8,565	6,865
Total liabilities	5,143	5,012
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total assets	(2,823)	(3,032)
Total liabilities	$ 297	$ 108