Segment Reporting - Condensed Statement of Operations (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Other revenue									$ 626	$ 527	$ 495
Net revenues	$ 1,901	$ 986	$ 1,002	$ 963	$ 949	$ 986	$ 992	$ 950	4,852	3,877	3,929
Depreciation and amortization									628	439	374
Loss from operations	$ 153	$ 81	$ 149	$ 149	$ 95	$ (53)	$ 105	$ 80	532	227	315
Interest expense									(774)	(599)	(683)
Gain on deconsolidation of subsidiary									30	0	7,125
Restructuring and support expenses									(2,028)	(5,729)	(1,017)
Loss on extinguishment of debt									(232)	0	0
Other income/(losses)									95	(29)	7
Income tax benefit/(provision)									1,995	(327)	106
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Other revenue									48	15	29
Net revenues									206	47	78
Depreciation and amortization									22	5	16
Loss from operations									(212)	(462)	(409)
Interest expense									(556)	(548)	(640)
Gain on deconsolidation of subsidiary									0		7,125
Restructuring and support expenses									(1,851)	(5,729)	(1,017)
Loss on extinguishment of debt									(215)
Other income/(losses)									90	(29)	7
Income tax benefit/(provision)									1,993	(328)	106
Operating Segments [Member] | Las Vegas, NV [Member]
Segment Reporting Information [Line Items]
Other revenue									492	447	399
Net revenues									2,897	2,625	2,543
Depreciation and amortization									420	344	278
Loss from operations									546	526	533
Interest expense									(65)	(21)	(16)
Gain on deconsolidation of subsidiary									0		0
Restructuring and support expenses									0	0	0
Loss on extinguishment of debt									(4)
Other income/(losses)									4	0	0
Income tax benefit/(provision)									0	1	0
Operating Segments [Member] | Other U.S. [Member]
Segment Reporting Information [Line Items]
Other revenue									93	65	67
Net revenues									1,756	1,205	1,308
Depreciation and amortization									186	90	80
Loss from operations									198	163	191
Interest expense									(153)	(30)	(27)
Gain on deconsolidation of subsidiary									30		0
Restructuring and support expenses									(177)	0	0
Loss on extinguishment of debt									(13)
Other income/(losses)									1	0	0
Income tax benefit/(provision)									2	0	0
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Other revenue									(7)	0	0
Net revenues									(7)	0	0
Depreciation and amortization									0	0	0
Loss from operations									0	0	0
Interest expense									0	0	0
Gain on deconsolidation of subsidiary									0		0
Restructuring and support expenses									0	0	0
Loss on extinguishment of debt									0
Other income/(losses)									0	0	0
Income tax benefit/(provision)									$ 0	$ 0	$ 0