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Employee Benefit Plans - Pension Plan Participation and Contribution Summary (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Multiemployer Plans [Line Items]      
Contributions $ 46us-gaap_MultiemployerPlanPeriodContributions $ 50us-gaap_MultiemployerPlanPeriodContributions $ 48us-gaap_MultiemployerPlanPeriodContributions
Southern Nevada Culinary and Bartenders Pension Plan [Member]      
Multiemployer Plans [Line Items]      
Entity Tax Identification Number 886016617    
Pension Plan Number 001    
Pension Protection Act Zone Status Green [1] Green [1]  
FIP/RP Status Pending/Implemented No [2]    
Contributions 18us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= czr_SouthernNevadaCulinaryAndBartendersPensionPlanMember
20us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= czr_SouthernNevadaCulinaryAndBartendersPensionPlanMember
19us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= czr_SouthernNevadaCulinaryAndBartendersPensionPlanMember
Surcharge Imposed No    
Expiration Date of Collective-Bargaining Agreement May 31, 2018    
Pension Plan of the UNITE HERE National Retirement Fund [Member]      
Multiemployer Plans [Line Items]      
Entity Tax Identification Number 136130178 [3]    
Pension Plan Number 001 [3]    
Pension Protection Act Zone Status Red [1],[3] Red [1],[3]  
FIP/RP Status Pending/Implemented Implemented [2],[3]    
Contributions 14us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= czr_PensionPlanOfUniteHereNationalRetirementFundMember
[3] 14us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= czr_PensionPlanOfUniteHereNationalRetirementFundMember
[3] 14us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= czr_PensionPlanOfUniteHereNationalRetirementFundMember
[3]
Surcharge Imposed No [3]    
Expiration Date of Collective-Bargaining Agreement Mar. 14, 2015 [3]    
Local 68 Engineers Union Pension Plan2 [Member]      
Multiemployer Plans [Line Items]      
Entity Tax Identification Number 510176618 [4]    
Pension Plan Number 001 [4]    
Pension Protection Act Zone Status Green [1],[4] Yellow [1],[4]  
FIP/RP Status Pending/Implemented Pending [2],[4]    
Contributions 1us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= czr_Local68EngineersUnionPensionPlan2Member
[4] 2us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= czr_Local68EngineersUnionPensionPlan2Member
[4] 2us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= czr_Local68EngineersUnionPensionPlan2Member
[4]
Surcharge Imposed No [4]    
Expiration Date of Collective-Bargaining Agreement Apr. 30, 2017    
NJ Carpenters Pension Fund [Member]      
Multiemployer Plans [Line Items]      
Entity Tax Identification Number 226174423    
Pension Plan Number 001    
Pension Protection Act Zone Status Yellow [1] Yellow [1]  
FIP/RP Status Pending/Implemented Implemented [2]    
Contributions 0us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= czr_NjCarpentersPensionFundMember
1us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= czr_NjCarpentersPensionFundMember
0us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= czr_NjCarpentersPensionFundMember
Surcharge Imposed No    
Expiration Date of Collective-Bargaining Agreement Apr. 30, 2017    
Painters IUPAT [Member]      
Multiemployer Plans [Line Items]      
Entity Tax Identification Number 526073909    
Pension Plan Number 001    
Pension Protection Act Zone Status Yellow [1] Yellow [1]  
FIP/RP Status Pending/Implemented Implemented [2]    
Contributions 1us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= czr_PaintersIUPATMember
1us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= czr_PaintersIUPATMember
1us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= czr_PaintersIUPATMember
Surcharge Imposed No    
Multiemployer Plan, Individually Insignificant Multiemployer Plans [Member]      
Multiemployer Plans [Line Items]      
Contributions $ 12us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= us-gaap_MultiemployerPlanIndividuallyInsignificantMultiemployerPlansMember
$ 12us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= us-gaap_MultiemployerPlanIndividuallyInsignificantMultiemployerPlansMember
$ 12us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= us-gaap_MultiemployerPlanIndividuallyInsignificantMultiemployerPlansMember
Maximum [Member] | Painters IUPAT [Member]      
Multiemployer Plans [Line Items]      
Expiration Date of Collective-Bargaining Agreement Apr. 30, 2017    
[1] Represents the Pension Protection Act (“PPA”) zone status for applicable plan year beginning January 1, 2014, except where noted otherwise.
[2] Indicates plans for which a financial improvement plan (“FIP”) or a rehabilitation plan (“RP”) is either pending or has been implemented.
[3] As described in Note 22, “Subsequent Events - Other,” in 2015, the Pension Plan of the UNITE HERE National Retirement Fund voted to expel Caesars Entertainment and its participating subsidiaries from the plan.
[4] Plan years begin July 1.