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Stockholders' Equity and Loss Per Share Stockholders' Equity and Loss Per Share Additional Information (Details) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended
Mar. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Class of Stock [Line Items]              
Maximum Aggregate Common Stock Offering Price $ 500czr_MaximumAggregateCommonStockOfferingPrice            
Stock Issued During Period, Shares, New Issues   7,000,000us-gaap_StockIssuedDuringPeriodSharesNewIssues 11,000,000us-gaap_StockIssuedDuringPeriodSharesNewIssues        
Issuance of common stock, net of fees   136us-gaap_ProceedsFromIssuanceOfCommonStock 217us-gaap_ProceedsFromIssuanceOfCommonStock 17us-gaap_ProceedsFromIssuanceOfCommonStock      
Proceeds from sale of interest in subsidiary   8us-gaap_ProceedsFromMinorityShareholders 1,198us-gaap_ProceedsFromMinorityShareholders 32us-gaap_ProceedsFromMinorityShareholders      
Caesars Entertainment Operating Company [Member]              
Class of Stock [Line Items]              
Equity Method Investment, Additional Information         68100    
Proceeds from Sale of Equity Method Investments         6us-gaap_ProceedsFromSaleOfEquityMethodInvestments
/ dei_LegalEntityAxis
= czr_CaesarsEntertainmentOperatingCompanyMember
   
Sale of Stock, Percentage of Ownership Sold   5.00%czr_SaleofStockPercentageofOwnershipSold
/ dei_LegalEntityAxis
= czr_CaesarsEntertainmentOperatingCompanyMember
         
Stock Issued During Period, Shares, Issued for Services         86,936us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ dei_LegalEntityAxis
= czr_CaesarsEntertainmentOperatingCompanyMember
   
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions           89.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
/ dei_LegalEntityAxis
= czr_CaesarsEntertainmentOperatingCompanyMember
 
Caesars Entertainment Operating Company [Member] | Noncontrolling Interest [Member]              
Class of Stock [Line Items]              
Partners' Capital Attributable to Noncontrolling Interest   (869)us-gaap_OtherMinorityInterests
/ dei_LegalEntityAxis
= czr_CaesarsEntertainmentOperatingCompanyMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
         
Other Noncontrolling Interest Allocation From Sale Of Stock   744czr_OtherNoncontrollingInterestAllocationFromSaleOfStock
/ dei_LegalEntityAxis
= czr_CaesarsEntertainmentOperatingCompanyMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
         
Caesars Baltimore AC [Member]              
Class of Stock [Line Items]              
Proceeds from sale of interest in subsidiary     35us-gaap_ProceedsFromMinorityShareholders
/ dei_LegalEntityAxis
= czr_CaesarsBaltimoreACMember
       
Net Income (Loss) Allocated to Limited Partners     9us-gaap_NetIncomeLossAllocatedToLimitedPartners
/ dei_LegalEntityAxis
= czr_CaesarsBaltimoreACMember
       
Caesars Growth Partners, LLC [Member]              
Class of Stock [Line Items]              
Proceeds from Divestiture of Businesses             13us-gaap_ProceedsFromDivestitureOfBusinesses
/ dei_LegalEntityAxis
= czr_CaesarsGrowthPartnersLlcMember
Sale of Stock, Consideration Received Per Transaction   $ 1,173us-gaap_SaleOfStockConsiderationReceivedPerTransaction
/ dei_LegalEntityAxis
= czr_CaesarsGrowthPartnersLlcMember
         
CR Baltimore Holdings [Member]              
Class of Stock [Line Items]              
Sale of Stock, Percentage of Ownership before Transaction   51.80%us-gaap_SaleOfStockPercentageOfOwnershipBeforeTransaction
/ dei_LegalEntityAxis
= czr_CRBaltimoreHoldingsMember
         
Sale of Stock, Percentage of Ownership after Transaction   41.40%us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction
/ dei_LegalEntityAxis
= czr_CRBaltimoreHoldingsMember