Revenue Recognition Revenue Recognition - Effect of Adopting New Revenue Recognition Standard (Details) - USD ($) $ in Millions		3 Months Ended									12 Months Ended
		Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017		Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Receivables, net		$ 457				$ 494					$ 457		$ 494		$ 167
Property and equipment, net (1)	[1]	16,045				16,154	[2]				16,045		16,154	[2]
Accrued expenses and other current liabilities ($1 and $0 attributable to our VIEs)	[3]	1,217				1,326					1,217		1,326
Contract liabilities	[3]	144				129					144		129
Financing obligations	[1]	10,057				9,355					10,057		9,355
Deferred credits and other liabilities		849				1,474					849		1,474
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		3,338				3,297					3,338		3,297		(1,607)		$ 2,042
Revenue from Contract with Customer, Including Assessed Tax		2,115	$ 2,185	$ 2,119	$ 1,972	1,901		$ 993	$ 1,008	$ 966	8,391		4,868		3,877
Promotional allowance													0		0
Selling, General and Administrative Expense											1,761		1,124		1,147
Other Cost of Operating Revenue											202		48		0
Depreciation, Depletion and Amortization, Nonproduction											1,145		626		439
Corporate expense											332		202		194
Other Cost and Expense, Operating											155	[4]	65	[4]	91	[5]
Total operating expenses											7,652		4,331		3,651
Income from operations		100	232	282	125	154		84	149	150	739		537		226
Interest expense											(1,346)		(773)		(599)
Deconsolidation, Gain (Loss), Amount											0		31		0
Restructuring Charges											0		(2,028)		(5,729)
Gain (Loss) on Extinguishment of Debt											(1)		(232)		0
Other Nonoperating Income (Expense)											791	[4]	95	[4]	(29)
Income (loss) from continuing operations before income taxes, Noncontrolling Interest											183		(2,370)		(6,131)
Income Tax Expense (Benefit)	[6],[7]										121		1,995		(327)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest											304		(375)		(6,458)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest											0		0		3,380
Net income/(loss)		198	111	29	(34)	2,004		(439)	(1,432)	(508)	304		(375)		(3,078)
Net Income (Loss) Attributable to Noncontrolling Interest											(1)		7		29
Net Income (Loss) Attributable to Parent		$ 198	$ 110	$ 29	$ (34)	2,004		$ (433)	$ (1,432)	$ (507)	303		(368)		(3,049)
Adjustments for New Accounting Pronouncement [Member]
Receivables, net						(2)							(2)
Property and equipment, net (1)	[1]					(74)							(74)
Accrued expenses and other current liabilities ($1 and $0 attributable to our VIEs)	[3]					(133)							(133)
Contract liabilities	[3]					129							129
Financing obligations	[1]					(74)							(74)
Deferred credits and other liabilities						1							1
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest						1							1		2		3
Previously Reported [Member]
Receivables, net						496							496
Property and equipment, net (1)	[1]					16,228							16,228
Accrued expenses and other current liabilities ($1 and $0 attributable to our VIEs)	[3]					1,459							1,459
Contract liabilities	[3]					0							0
Financing obligations	[1]					9,429							9,429
Deferred credits and other liabilities						1,473							1,473
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest						$ 3,296							3,296		(1,609)		$ 2,039
Net revenues													4,852		3,877
Promotional allowance													(679)		(538)
Selling, General and Administrative Expense													1,133		1,166
Other Cost of Operating Revenue													48		0
Depreciation, Depletion and Amortization, Nonproduction													628		439
Corporate expense													204		194
Other Cost and Expense, Operating													64		91
Total operating expenses													4,320		3,650
Income from operations													532		227
Interest expense													(774)		(599)
Deconsolidation, Gain (Loss), Amount													30		0
Restructuring Charges													(2,028)		(5,729)
Gain (Loss) on Extinguishment of Debt													(232)		0
Other Nonoperating Income (Expense)													95		(29)
Income (loss) from continuing operations before income taxes, Noncontrolling Interest													(2,377)		(6,130)
Income Tax Expense (Benefit)													1,995		(327)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest													(382)		(6,457)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest													0		3,380
Net income/(loss)													(382)		(3,077)
Net Income (Loss) Attributable to Noncontrolling Interest													7		29
Net Income (Loss) Attributable to Parent													(375)		(3,048)
Casino [Member]
Revenue from Contract with Customer, Including Assessed Tax											4,247		2,168		1,608
Direct Operating Costs											(2,393)		(1,213)		(890)
Casino [Member] | Previously Reported [Member]
Net revenues													2,865		2,177
Direct Operating Costs													(1,521)		(1,128)
Food and Beverage [Member]
Revenue from Contract with Customer, Including Assessed Tax											1,574		982		822
Direct Operating Costs											(1,106)		(693)		(572)
Food and Beverage [Member] | Previously Reported [Member]
Net revenues													938		788
Direct Operating Costs													(446)		(383)
Occupancy [Member]
Revenue from Contract with Customer, Including Assessed Tax											1,519		1,074		950
Direct Operating Costs											(480)		(360)		(318)
Occupancy [Member] | Previously Reported [Member]
Net revenues													1,054		923
Direct Operating Costs													(276)		(249)
License and Service [Member]
Revenue from Contract with Customer, Including Assessed Tax											60		12		0
License and Service [Member] | Previously Reported [Member]
Net revenues													626		527
Product and Service, Other [Member]
Net revenues											161		179		178
Revenue from Contract with Customer, Including Assessed Tax											789		584		497
Product and Service, Other [Member] | Previously Reported [Member]
Net revenues													0		0
Service, Other [Member]
Revenue from Contract with Customer, Including Assessed Tax											$ 202		48		0
Service, Other [Member] | Previously Reported [Member]
Net revenues													$ 48		$ 0

[1] The conditions that were considered prohibited forms of continuing involvement related to our sale of the Golf Course Properties (see Note 11) are no longer considered continuing involvement under the new revenue recognition standard. As a result of adopting the new standard on a full retrospective basis, we are now reflecting this transaction as a completed sale in the period in which it occurred.

[2] (1) We reclassified $73 million in land improvements to Buildings, riverboats and leasehold and land improvements to align with our 2018 reporting presentation.

[3] Adjustments are primarily related to the reclassification of assets and liabilities in accordance with the new accounting and disclosure requirements.

[4] (2) Amounts include changes in fair value of the derivative liability related to the conversion option of the CEC Convertible Notes and the disputed claims liability as well as interest and dividend income.

[5] (3) Amounts primarily represent costs incurred in connection with development activities and reorganization activities, and/or recoveries associated with such items, including acquisition and integration costs, contract exit fees including exiting the fully bundled sales system of NV Energy for electric service at our Nevada properties, lease termination costs, gains and losses on asset sales, weather related property closure costs, demolition costs primarily at our Las Vegas properties for renovations, and project opening costs.

[6] (1) Taxes are recorded at the consolidated level and not estimated or recorded to our Las Vegas and Other U.S. segments.

[7] (1) Taxes are recorded at the consolidated level and not estimated or recorded to our Las Vegas and Other U.S. segments.