Acquisitions, Investments, Dispositions and Divestitures - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended			9 Months Ended	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Jun. 30, 2014	Mar. 31, 2013	Sep. 30, 2014	Jun. 30, 2013
Line Items
Tangible Asset Impairment Charges	$ 138	$ 2,576	$ 631
Impairment of tangible and other intangible assets	994	2,831	624
Write-downs, reserves, and project opening costs, net of recoveries	120	104	99
Caesars Interactive Entertainment [Member] | CIE RMG BEL [Member]
Line Items
Impairment of tangible and other intangible assets				16
Caesars Interactive Entertainment [Member] | Pacific Interactive [Member]
Line Items
Contingent earnout liability					29
Caesars Interactive Entertainment [Member] | Buffalo Studios, LLC [Member]
Line Items
Contingent earnout liability		59	6			59
Business Combination, Consideration Transferred			45
Caesars Growth Partners, LLC [Member]
Line Items
Proceeds from Divestiture of Businesses					13
Caesars Growth Partners, LLC [Member] | Baltimore, Maryland Joint Venture [Member]
Line Items
Investment or capital committment in joint venture			78
Purchase of additional interests in subsidiaries		56
Total ownership interest property	41.00%						41.00%
Caesars Entertainment Operating Company [Member] | Sterling Suffolk Racecourse, LLC [Member]
Line Items
Impairment of tangible and other intangible assets						60
Equity Method Investments		102				102
Income (Loss) from Equity Method Investments						102
Write-downs, reserves, and project opening costs, net of recoveries		42
Caesars Entertainment Operating Company [Member] | Sterling Suffolk Racecourse, LLC [Member] | Convertible Preferred Stock [Member]
Line Items
Equity Method Investments		42				42
Caesars Entertainment Operating Company [Member] | Sterling Suffolk Racecourse, LLC [Member] | Common Stock [Member]
Line Items
Equity Method Investments	60						60
Caesars Entertainment Operating Company [Member] | Macau [Member]
Line Items
Proceeds from Divestiture of Businesses						425
Tangible Asset Impairment Charges		6
Caesars Entertainment Operating Company [Member] | Showboat Atlantic City [Member]
Line Items
Business Exit Costs	26
Business Exit Costs Paid	5
Accrued Liabilities	20						20
Proceeds from Divestiture of Businesses							18
Tangible Asset Impairment Charges							10
Assets held for sale	18						18
Caesars Entertainment Operating Company [Member] | Harrahs Tunica [Member]
Line Items
Business Exit Costs								16
Business Exit Costs Paid	6
Accrued Liabilities	10						10
Tangible Asset Impairment Charges		115
Impairment of tangible and other intangible assets								68
Caesars Entertainment Operating Company [Member] | Golden Nugget Casino [Member]
Line Items
Business Exit Costs	1				13
Business Exit Costs Paid	4
Accrued Liabilities	10						10
Impairment of tangible and other intangible assets					2
Caesars Entertainment Operating Company [Member] | Alea Leeds [Member]
Line Items
Business Exit Costs	2								16
Business Exit Costs Paid	2
Accrued Liabilities	16						16
Impairment of tangible and other intangible assets									6
Caesars Entertainment Operating Company [Member] | Claridge Hotel Tower, Atlantic City [Member]
Line Items
Proceeds received from (paid for) sale of assets						13
Assets Held-for-sale, Other, Noncurrent	0	12				12	0
Caesars Entertainment Operating Company [Member] | Council Bluffs, Iowa [Member]
Line Items
Business Exit Costs	65
Accrued Liabilities	43						43
Caesars Entertainment Operating Company [Member] | Harrah's Gulf Coast [Member]
Line Items
Business Exit Costs	9		20
Business Exit Costs Paid	4
Accrued Liabilities	26	21				21	26
Caesars Entertainment Operating Company [Member] | Baluma S.A. [Member] | Conrad Punta Del Este Resort and Casino [Member]
Line Items
Dispositions, Percentage of Voting Interests Sold											45.00%
Dispositions, Consideration for Sale Of Subsidiary											140
Proceeds from the sale of a subsidiary	50
Cash Divested from Deconsolidation	30
Dispositions, Equity Received in Acquiring Company	4.50%						4.50%
Caesars Entertainment Operating Company [Member] | Enjoy S.A. [Member] | Conrad Punta Del Este Resort and Casino [Member]
Line Items
Dispositions, Deferred Cash Payment to be Received	32						32
Caesars Entertainment Resort Properties [Member] | AC Conference [Member]
Line Items
Book value of Assets Sold										$ 82