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Stock-Based Compensation Stock-Based Compansation - CIE Stock Option Activity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
CIE Stock Option Activity, Shares      
Shares Outstanding, Beginning of Period 8,463,811us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber    
Shares Granted 1,500,770us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 550,812us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 8,173,944us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Shares Exercised (317,703)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised (143,109)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Shares Forfeited (237,202)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod    
Shares Outstanding, End of Period 9,379,885us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 8,463,811us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber  
Shares Vested and Expected to Vest, Outstanding, Number 9,060,016us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber    
Shares Exercisable 3,746,013us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber    
Weighted Average Exercise Price [Abstract]      
Weighted Average Exercise Price Outstanding, Beginning of Period $ 12.09us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice    
Weighted Average Exercise Price Granted $ 21.18us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice [1],[2] $ 13.65us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice [1],[2] $ 8.44us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice [1],[2]
Weighted Average Exercise Price Exercised $ 9.10us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice    
Weighted Average Exercise Price Forfeited $ 11.30us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice    
Weighted Average Exercise Price Outstanding, End of Period $ 13.65us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 12.09us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice  
Weighted Average Exercise Price, Vested and Expected to Vest $ 12.09us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice    
Weighted Average Exercise Price Exercisable $ 9.61us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice    
Fair Value, Weighted Average Exercise Price      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value $ 3.35czr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageGrantDateFairValue [1] $ 2.68czr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageGrantDateFairValue [1]  
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]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Weighted Average Grant Date Fair Value $ 1.78czr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageGrantDateFairValue [1]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Grant Date Fair Value $ 3.98czr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageGrantDateFairValue [1]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Grant Date Fair Value $ 3.28czr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageGrantDateFairValue [1]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Grant Date Fair Value $ 1.80czr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageGrantDateFairValue [1]    
Weighted Average Remaining Contractual Term [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 7 years 10 months 8 years 6 months  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term 7 years 10 months    
Options Exercisable, Weighted Average Remaining Contractual Term 7 years 6 months    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 53us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value 52us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value 25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue    
Caesars Interactive Entertainment [Member]      
CIE Stock Option Activity, Shares      
Shares Outstanding, Beginning of Period 17,015us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember		    
Shares Granted 1,135us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember		 6,300us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember		 1,442us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember
Shares Exercised (3,822)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember		 (365)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember		 0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember
Shares Forfeited (1,049)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember		    
Shares Outstanding, End of Period 13,279us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember		 17,015us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember		  
Shares Vested and Expected to Vest, Outstanding, Number 12,581us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember		    
Shares Exercisable 6,920us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember		    
Weighted Average Exercise Price [Abstract]      
Weighted Average Exercise Price Outstanding, Beginning of Period $ 3,194.48us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ 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
Weighted Average Exercise Price Exercised $ 1,649.71us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember		    
Weighted Average Exercise Price Forfeited $ 5,767.76us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember		    
Weighted Average Exercise Price Outstanding, End of Period $ 3,953.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember		 $ 3,194.48us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember		  
Weighted Average Exercise Price, Vested and Expected to Vest $ 3,832.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember		    
Weighted Average Exercise Price Exercisable $ 2,202.24us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember		    
Fair Value, Weighted Average Exercise Price      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value $ 1,616.01czr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageGrantDateFairValue
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember		 [1] $ 1,124.81czr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageGrantDateFairValue
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember		 [1]  
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, Options, Exercises in Period, Weighted Average Grant Date Fair Value $ 249.57czr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageGrantDateFairValue
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember		 [1]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Grant Date Fair Value $ 2,764.01czr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageGrantDateFairValue
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember		 [1]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Grant Date Fair Value $ 1,544.87czr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageGrantDateFairValue
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember		 [1]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Grant Date Fair Value $ 547.75czr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageGrantDateFairValue
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember		 [1]    
Weighted Average Remaining Contractual Term [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 6 years 9 months 7 years 4 months  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term 6 years 8 months    
Options Exercisable, Weighted Average Remaining Contractual Term 5 years 1 month    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value 115us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember		    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value 111us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember		    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value $ 72us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue
/ dei_LegalEntityAxis
= czr_CaesarsInteractiveEntertainmentMember		    
[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.