Goodwill and Other Intangible Assets - Changes in Carrying Value of Goodwill by Segment (Details) - USD ($) $ in Millions			12 Months Ended
		Jul. 16, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Oct. 06, 2017
Goodwill [Line Items]
Reporting Unit, Zero or Negative Carrying Amount, Amount of Allocated Goodwill			$ 405
Goodwill [Roll Forward]
Goodwill, Gross			7,267	$ 5,060
Goodwill, Other Increase (Decrease)			(3)
Goodwill, Gross			7,539	7,267	$ 5,060
Impairment of goodwill			(43)	0	0
Goodwill, Impaired, Accumulated Impairment Loss, Beginning			(3,452)	(3,452)
Goodwill, Impaired, Accumulated Impairment Loss			(3,495)	(3,452)	(3,452)
Net Carrying Value of Goodwill	[1]		4,044	3,815
Las Vegas, NV [Member]
Goodwill [Roll Forward]
Goodwill, Gross			6,204	4,410
Goodwill, Other Increase (Decrease)			0
Goodwill, Gross			6,204	6,204	4,410
Impairment of goodwill			0
Goodwill, Impaired, Accumulated Impairment Loss, Beginning			(3,115)	(3,115)
Goodwill, Impaired, Accumulated Impairment Loss			(3,115)	(3,115)	(3,115)
Net Carrying Value of Goodwill	[1]		3,089	3,089
Other U.S. [Member]
Goodwill [Roll Forward]
Goodwill, Gross			1,002	650
Goodwill, Other Increase (Decrease)			0
Goodwill, Gross			1,277	1,002	650
Impairment of goodwill			(17)
Goodwill, Impaired, Accumulated Impairment Loss, Beginning			(337)	(337)
Goodwill, Impaired, Accumulated Impairment Loss			(354)	(337)	(337)
Net Carrying Value of Goodwill	[1]		923	665
Corporate and Other [Member]
Goodwill [Roll Forward]
Goodwill, Gross			61	0
Goodwill, Other Increase (Decrease)			(3)
Goodwill, Gross			58	61	0
Impairment of goodwill			(26)
Goodwill, Impaired, Accumulated Impairment Loss, Beginning			0	0
Goodwill, Impaired, Accumulated Impairment Loss			(26)	0	$ 0
Net Carrying Value of Goodwill	[1]		32	61
OpCo [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period	[2]			2,207
Net Carrying Value of Goodwill						$ 2,207
OpCo [Member] | Las Vegas, NV [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period	[2]			1,794
OpCo [Member] | Other U.S. [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period	[2]			352
OpCo [Member] | Corporate and Other [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period	[2]			$ 61
Centaur Holdings, LLC [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period	[2]		275
Centaur Holdings, LLC [Member] | Las Vegas, NV [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period	[2]		0
Centaur Holdings, LLC [Member] | Other U.S. [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period	[2]	$ 275
Centaur Holdings, LLC [Member] | Corporate and Other [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period	[2]		$ 0

[1] (2) $405 million of goodwill is associated with a reporting unit with zero or negative carrying value. As the reporting unit has a positive fair value, there was no impairment associated with this reporting unit.

[2] (1) See Note 4 for further details relating to the acquisitions of OpCo and Centaur.