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Stock-Based Compensation Stock-Based Compensation - Additional Information (Details) (USD $)
In Millions, except Share data, 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, 2012
Jun. 30, 2014
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 9,379,885us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 8,463,811us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber          
Weighted Average Exercise Price Granted $ 21.18us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice [1],[2] $ 13.65us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice [1],[2] $ 8.44us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice [1],[2]        
Share-based Compensation $ 132us-gaap_ShareBasedCompensation $ 57us-gaap_ShareBasedCompensation $ 55us-gaap_ShareBasedCompensation        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options 57us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 10 months            
Allocated Share-based Compensation Expense 132us-gaap_AllocatedShareBasedCompensationExpense 57us-gaap_AllocatedShareBasedCompensationExpense 55us-gaap_AllocatedShareBasedCompensationExpense        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 10.27us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue [1] $ 5.95us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue [1] $ 3.50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue [1]        
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare          
Vesting Period One [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage of performace-based options 50.00%czr_VestingPercentageOfPerformaceBasedOptions
/ us-gaap_VestingAxis
= czr_VestingPeriodOneMember
           
Vesting Period Two [Member] [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting percentage of performace-based options 50.00%czr_VestingPercentageOfPerformaceBasedOptions
/ us-gaap_VestingAxis
= czr_VestingPeriodTwoMemberMember
           
Replacement Options [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted Average Exercise Price Granted     $ 8.22us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= czr_ReplacementOptionsMember
       
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term     10 years        
Percentage Of Stock Options Vesting Per Year 20.00%czr_PercentageOfStockOptionsVestingPerYear
/ us-gaap_AwardTypeAxis
= czr_ReplacementOptionsMember
           
Chairman, CEO and President Performance-Based Options [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number Of Stock Options Eligible For Exchange   290,334czr_NumberOfStockOptionsEligibleForExchange
/ us-gaap_AwardTypeAxis
= czr_ChairmanCeoAndPresidentPerformanceBasedOptionsMember
         
Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock Issued During Period, Value, Restricted Stock Award, Gross 25us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
           
Units Granted in Period 1,183,098us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
           
Units Outstanding 2,156,727us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
1,503,534us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
         
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 13.74us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
           
Restricted Stock Units (RSUs) [Member] | Annual [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_VestingAxis
= czr_AnnualMember
           
Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Units Granted in Period       0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Minimum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years            
Maximum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years 6 months            
Management Equity Incentive Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 23,755us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= czr_ManagementEquityIncentivePlanMember
           
Management Equity Incentive Plan [Member] | Minimum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Return On Investment 175.00%czr_ReturnOnInvestment
/ us-gaap_PlanNameAxis
= czr_ManagementEquityIncentivePlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
           
Management Equity Incentive Plan [Member] | Maximum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Return On Investment 200.00%czr_ReturnOnInvestment
/ us-gaap_PlanNameAxis
= czr_ManagementEquityIncentivePlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
           
2012 Incentive Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 15,449,468us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= czr_TwoThousandsOneTwoIncentivePlanMember
           
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 3,374,865us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= czr_TwoThousandsOneTwoIncentivePlanMember
           
Weighted Average Exercise Price Granted         $ 20.09us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= czr_TwoThousandsOneTwoIncentivePlanMember
   
Share-based Compensation 15us-gaap_ShareBasedCompensation
/ us-gaap_PlanNameAxis
= czr_TwoThousandsOneTwoIncentivePlanMember
           
2012 Incentive Plan [Member] | Replacement Options [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common Stock Closing Price Per Share $ 57.41czr_CommonStockClosingPricePerShare
/ us-gaap_AwardTypeAxis
= czr_ReplacementOptionsMember
/ us-gaap_PlanNameAxis
= czr_TwoThousandsOneTwoIncentivePlanMember
           
2012 Incentive Plan [Member] | Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common Stock Closing Price Per Share $ 35.00czr_CommonStockClosingPricePerShare
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= czr_TwoThousandsOneTwoIncentivePlanMember
           
2012 Incentive Plan [Member] | Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 2 years            
Units Granted in Period     50,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= czr_TwoThousandsOneTwoIncentivePlanMember
       
Units Outstanding 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= czr_TwoThousandsOneTwoIncentivePlanMember
           
Caesars Entertainment Operating Company [Member] | Two Thousand Fourteen Performance Incentive Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Units Granted in Period           86,936us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ dei_LegalEntityAxis
= czr_CaesarsEntertainmentOperatingCompanyMember
/ us-gaap_PlanNameAxis
= czr_TwoThousandFourteenPerformanceIncentivePlanMember
 
Allocated Share-based Compensation Expense           8us-gaap_AllocatedShareBasedCompensationExpense
/ dei_LegalEntityAxis
= czr_CaesarsEntertainmentOperatingCompanyMember
/ us-gaap_PlanNameAxis
= czr_TwoThousandFourteenPerformanceIncentivePlanMember
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value           $ 90.31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ dei_LegalEntityAxis
= czr_CaesarsEntertainmentOperatingCompanyMember
/ us-gaap_PlanNameAxis
= czr_TwoThousandFourteenPerformanceIncentivePlanMember
 
Caesars Acquisition Company [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Allocated Share-based Compensation Expense 10us-gaap_AllocatedShareBasedCompensationExpense
/ dei_LegalEntityAxis
= czr_CaesarsAcquisitionCompanyMember
           
Common stock, par value           $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
/ dei_LegalEntityAxis
= czr_CaesarsAcquisitionCompanyMember
 
Caesars Acquisition Company [Member] | CAC Equity-Based Compensation Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-Based Compensation Arrangement by Share-Based Payment Award, Value of Shares Available for Grant           25czr_ShareBasedCompensationArrangementbyShareBasedPaymentAwardValueofSharesAvailableforGrant
/ dei_LegalEntityAxis
= czr_CaesarsAcquisitionCompanyMember
/ us-gaap_PlanNameAxis
= czr_CACEquityBasedCompensationPlanMember
 
Caesars Interactive Entertainment [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 13,279us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember
17,015us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember
         
Weighted Average Exercise Price Granted $ 9,976.43us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember
$ 5,539.98us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember
$ 5,360.86us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember
       
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options 93us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember
           
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 3 years 4 months            
Units Granted in Period 1,209us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember
           
Units Outstanding 5,096us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember
7,991us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember
         
Allocated Share-based Compensation Expense 87us-gaap_AllocatedShareBasedCompensationExpense
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember
25us-gaap_AllocatedShareBasedCompensationExpense
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember
21us-gaap_AllocatedShareBasedCompensationExpense
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember
      20us-gaap_AllocatedShareBasedCompensationExpense
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 4,717.02us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember
[1] $ 2,620.48us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember
[1] $ 2,724.86us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember
[1]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 4,496.67us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember
           
Caesars Interactive Entertainment [Member] | Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Units Granted in Period   5,260us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember
         
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 5,470.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember
[1]          
Caesars Interactive Entertainment [Member] | Management Equity Incentive Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent $ 103us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember
/ us-gaap_PlanNameAxis
= czr_ManagementEquityIncentivePlanMember
           
[1] Represents the weighted-average grant date fair value per option, using the Monte Carlo simulation option-pricing model for performance-based options, and the Black-Scholes option-pricing model for time-based options.
[2] Adjusted for the February 2012 1.742-for-1 stock split.