Description of Business Description of Business - Additional Information (Details) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 06, 2017 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) Casinos shares	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) reportable_segment Casinos shares	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2017 shares
Number of Reportable Segments | reportable_segment				2
Business Combination, Contingent Consideration Arrangements, Description				CEC and CAC entered into the Amended and Restated Agreement and Plan of Merger, dated as of July 9, 2016, as amended by the First Amendment to Amended and Restated Agreement and Plan of Merger, dated as of February 20, 2017 (as amended, the “Merger Agreement”). Pursuant to the Merger Agreement, on the October 6, 2017 Effective Date, CAC completed the merger with and into CEC, with CEC as the surviving company (the “Merger”). Subject to the terms and conditions of the Merger Agreement, each share of CAC common stock issued and outstanding immediately prior to the effective date of the Merger was converted into, and became exchangeable for, 1.625 (the “Exchange Ratio”) shares of CEC common stock.
Common Stock, Shares Authorized | shares		2,000,000,000		2,000,000,000			1,250,000,000
Restructuring of CEOC and other		$ (446)	$ (3,070)	$ (2,319)	$ (5,333)
Accrued restructuring and support expenses		8,776		8,776		$ 6,601
Stock Repurchased During Period, Value					625
Long-term Purchase Commitment, Amount				700
Cash and cash equivalents		1,515		1,515		1,513
Affiliated Entity [Member]
Cash and cash equivalents		92		92
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member]
Issuance of CEC common stock		3,507		3,507		1,936
CEOC
Restructuring of CEOC and other		472		2,300
Accrued restructuring and support expenses		8,776		8,776		6,601
Notes Payable, Related Parties, Current		0		0		35
CEOC | Convertible Debt [Member]
Debt Instrument, Face Amount		1,100		1,100
CEOC | Other Restructuring [Member]
Payments for Restructuring		$ 104		$ 173		$ 34
Subsequent Event [Member] | Common Stock Subject to Mandatory Redemption [Member]
Stock Repurchased During Period, Shares | shares	146,000,000
Stock Repurchased During Period, Value	$ 1,000
Sale of Stock, Price Per Share | $ / shares	$ 6.86
Subsequent Event [Member] | CEOC | Common Stock Subject to Mandatory Redemption [Member]
Stock Repurchased During Period, Shares | shares	146,000,000
UNITED STATES
Number Of Casinos Operated Or Managed | Casinos		12		12
UNITED STATES | LAS VEGAS, NEVADA | Geographic Concentration Risk [Member]
Number Of Casinos Operated Or Managed | Casinos		8		8
UNITED STATES | LAS VEGAS, NEVADA | Geographic Concentration Risk [Member] | Sales Revenue, Net [Member]
Concentration Risk, Percentage		67.00%		67.00%
CERP
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest				100.00%
Corporate, Non-Segment [Member]
Restructuring of CEOC and other		$ (472)	$ (3,072)	$ (2,348)	$ (5,335)
Cash and cash equivalents		$ 122		$ 122