Acquisitions, Investments, Dispositions and Divestitures - Income from Discontinued Operations (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Tangible and intangible asset impairments	$ 1	$ 994	$ 2,831
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues	0	163	343
Pre-tax loss from operations	(7)	(213)	(239)
Loss, net of income taxes	(7)	(192)	(207)
Tangible and intangible asset impairments	0	95	199
Discontinued Operations, Held-for-sale [Member] | Discontinued Operations [Member] | Showboat Atlantic City [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues	0	115	199
Pre-tax loss from operations	(6)	(59)	(66)
Loss, net of income taxes	(6)	(38)	(83)
Tangible and intangible asset impairments	0	10	69
Discontinued Operations, Disposed of by Means Other than Sale, Abandonment [Member] | Discontinued Operations [Member] | Harrahs Tunica [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues	0	46	130
Pre-tax loss from operations	0	(120)	(140)
Loss, net of income taxes	0	(120)	(91)
Tangible and intangible asset impairments	0	68	118
Discontinued Operations, Disposed of by Means Other than Sale, Abandonment [Member] | Discontinued Operations [Member] | Disposal Group Other [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues	0	2	14
Pre-tax loss from operations	(1)	(34)	(33)
Loss, net of income taxes	(1)	(34)	(33)
Tangible and intangible asset impairments	$ 0	$ 17	$ 12