Revenue Recognition - Disaggregation of Revenue - By Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue from Contract with Customer, Including Assessed Tax	$ 2,185	$ 993	$ 6,276	$ 2,967
Casino
Revenue from Contract with Customer, Including Assessed Tax	1,102	389	3,147	1,199
Food and Beverage [Member]
Revenue from Contract with Customer, Including Assessed Tax	408	206	1,182	617
Occupancy [Member]
Revenue from Contract with Customer, Including Assessed Tax	395	253	1,150	742
Management Service [Member]
Revenue from Contract with Customer, Including Assessed Tax	16	0	46	0
Service, Other [Member]
Revenue from Contract with Customer, Including Assessed Tax	51	0	151	0
Entertainment and other
Revenue from Contract with Customer, Including Assessed Tax	168	96	477	267
Product and Service, Other [Member]
Revenue from Contract with Customer, Including Assessed Tax	213	145	600	409
Revenues	45	49	123	142
Eliminations
Revenue from Contract with Customer, Including Assessed Tax	(2)	(1)	(7)	(2)
Eliminations | Casino
Revenue from Contract with Customer, Including Assessed Tax	0	0	0	0
Eliminations | Food and Beverage [Member]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0	0
Eliminations | Occupancy [Member]
Revenue from Contract with Customer, Including Assessed Tax	0	0	0	0
Eliminations | Management Service [Member]
Revenue from Contract with Customer, Including Assessed Tax	0		(3)
Eliminations | Service, Other [Member]
Revenue from Contract with Customer, Including Assessed Tax	0		0
Eliminations | Entertainment and other
Revenue from Contract with Customer, Including Assessed Tax	(2)	(1)	(4)	(2)
Eliminations | Product and Service, Other [Member]
Revenues	0	0	0	0
All Other
Revenue from Contract with Customer, Including Assessed Tax	152	23	446	57
All Other | Casino
Revenue from Contract with Customer, Including Assessed Tax	64	15	187	38
All Other | Food and Beverage [Member]
Revenue from Contract with Customer, Including Assessed Tax	6	0	20	0
All Other | Occupancy [Member]
Revenue from Contract with Customer, Including Assessed Tax	0	0	2	0
All Other | Management Service [Member]
Revenue from Contract with Customer, Including Assessed Tax	18		49
All Other | Service, Other [Member]
Revenue from Contract with Customer, Including Assessed Tax	50		149
All Other | Entertainment and other
Revenue from Contract with Customer, Including Assessed Tax	12	7	35	16
All Other | Product and Service, Other [Member]
Revenues	2	1	4	3
Las Vegas | Operating Segments
Revenue from Contract with Customer, Including Assessed Tax	910	687	2,804	2,042
Las Vegas | Operating Segments | Casino
Revenue from Contract with Customer, Including Assessed Tax	249	203	817	605
Las Vegas | Operating Segments | Food and Beverage [Member]
Revenue from Contract with Customer, Including Assessed Tax	244	156	731	474
Las Vegas | Operating Segments | Occupancy [Member]
Revenue from Contract with Customer, Including Assessed Tax	271	206	833	622
Las Vegas | Operating Segments | Management Service [Member]
Revenue from Contract with Customer, Including Assessed Tax	0		0
Las Vegas | Operating Segments | Service, Other [Member]
Revenue from Contract with Customer, Including Assessed Tax	0		0
Las Vegas | Operating Segments | Entertainment and other
Revenue from Contract with Customer, Including Assessed Tax	106	77	312	210
Las Vegas | Operating Segments | Product and Service, Other [Member]
Revenues	40	45	111	131
Other U.S. | Operating Segments
Revenue from Contract with Customer, Including Assessed Tax	1,125	284	3,033	870
Other U.S. | Operating Segments | Casino
Revenue from Contract with Customer, Including Assessed Tax	789	171	2,143	556
Other U.S. | Operating Segments | Food and Beverage [Member]
Revenue from Contract with Customer, Including Assessed Tax	158	50	431	143
Other U.S. | Operating Segments | Occupancy [Member]
Revenue from Contract with Customer, Including Assessed Tax	124	47	315	120
Other U.S. | Operating Segments | Management Service [Member]
Revenue from Contract with Customer, Including Assessed Tax	(2)		0
Other U.S. | Operating Segments | Service, Other [Member]
Revenue from Contract with Customer, Including Assessed Tax	1		2
Other U.S. | Operating Segments | Entertainment and other
Revenue from Contract with Customer, Including Assessed Tax	52	13	134	43
Other U.S. | Operating Segments | Product and Service, Other [Member]
Revenues	3	3	8	8
Previously Reported [Member]
Revenues		986		2,951
Previously Reported [Member] | Consolidation, Eliminations [Member]
Revenues		0		0
Accounting Standards Update 2014-09 [Member]
Revenue from Contract with Customer, Including Assessed Tax	2,140	944	6,153	2,825
Accounting Standards Update 2014-09 [Member] | Eliminations
Revenue from Contract with Customer, Including Assessed Tax	(2)	(1)	(7)	(2)
Accounting Standards Update 2014-09 [Member] | All Other
Revenue from Contract with Customer, Including Assessed Tax	150	22	442	54
Accounting Standards Update 2014-09 [Member] | Las Vegas | Operating Segments
Revenue from Contract with Customer, Including Assessed Tax	870	642	2,693	1,911
Accounting Standards Update 2014-09 [Member] | Other U.S. | Operating Segments
Revenue from Contract with Customer, Including Assessed Tax	$ 1,122	$ 281	$ 3,025	$ 862