Debt - Summary of Debt (Details) - USD ($)		6 Months Ended
		Jun. 30, 2017		May 12, 2017	Apr. 27, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 6,886,000,000
Long-term Debt		6,792,000,000				$ 6,838,000,000
Current portion of long-term debt		(48,000,000)				(89,000,000)
Long Term Debt Non Current Face Value		6,838,000,000
Long-term Debt, Excluding Current Maturities		6,744,000,000				6,749,000,000
Debt Instrument, Unamortized Discount		94,000,000				110,000,000
Long-term Debt, Fair Value		7,140,000,000
Secured Debt [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		0
Variable Interest Entity, Primary Beneficiary [Member]
Debt Instrument [Line Items]
Current portion of long-term debt		(22,000,000)				(21,000,000)
Long-term Debt, Excluding Current Maturities		2,255,000,000				2,254,000,000
CERP
Debt Instrument [Line Items]
Long-term Debt, Gross		4,564,000,000
Long-term Debt		4,515,000,000				4,563,000,000
Current portion of long-term debt		(26,000,000)				(68,000,000)
Long Term Debt Non Current Face Value		4,538,000,000
Long-term Debt, Excluding Current Maturities		$ 4,489,000,000				4,495,000,000
CERP | Line of Credit [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Final Maturity Date	[1]	2018
Long-term Debt, Gross	[1]	$ 0
Long-term Debt	[1]	0				40,000,000
Line of Credit Facility, Maximum Borrowing Capacity at Rate 2		59,000,000
CERP | Line of Credit [Member] | Amended Revolver | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity at Rate 1		$ 211,000,000
CERP | Secured Debt [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Final Maturity Date	[2]	2020
Debt Instrument, Interest Rate, Stated Percentage	[2],[3]	4.73%
Long-term Debt, Gross		$ 2,413,000,000	[2]	$ 2,400,000,000
Long-term Debt	[2]	$ 2,379,000,000				2,387,000,000
CERP | Secured Debt [Member] | First Lien Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Final Maturity Date		2020
Debt Instrument, Interest Rate, Stated Percentage	[3]	8.00%
Long-term Debt, Gross		$ 1,000,000,000
Long-term Debt		$ 995,000,000				993,000,000
CERP | Secured Debt [Member] | Second Lien Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Final Maturity Date		2021
Debt Instrument, Interest Rate, Stated Percentage	[3]	11.00%
Long-term Debt, Gross		$ 1,150,000,000
Long-term Debt		$ 1,140,000,000				1,140,000,000
CERP | Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Debt Instrument, Final Maturity Date		2017
Long-term Debt, Gross		$ 1,000,000
Long-term Debt		1,000,000				3,000,000
CGP | Variable Interest Entity, Primary Beneficiary [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		2,322,000,000
Long-term Debt		2,277,000,000				2,275,000,000
Current portion of long-term debt		(22,000,000)				(21,000,000)
Long Term Debt Non Current Face Value		2,300,000,000
Long-term Debt, Excluding Current Maturities		$ 2,255,000,000				2,254,000,000
CGP | Variable Interest Entity, Primary Beneficiary [Member] | Line of Credit [Member] | Horseshoe Baltimore Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Final Maturity Date	[4]	2018
Long-term Debt, Gross	[4]	$ 0
Long-term Debt	[4]	0				0
CGP | Variable Interest Entity, Primary Beneficiary [Member] | Line of Credit [Member] | Cromwell Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		0
Long-term Debt		$ 0				167,000,000
CGP | Variable Interest Entity, Primary Beneficiary [Member] | Secured Debt [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Final Maturity Date	[5]	2021
Debt Instrument, Interest Rate, Stated Percentage	[5],[6]	4.23%
Long-term Debt, Gross		$ 1,314,000,000	[5]		$ 1,300,000,000
Long-term Debt	[5]	$ 1,291,000,000				1,119,000,000
CGP | Variable Interest Entity, Primary Beneficiary [Member] | Secured Debt [Member] | CGPH Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Final Maturity Date		2022
Debt Instrument, Interest Rate, Stated Percentage	[6]	9.38%
Long-term Debt, Gross		$ 675,000,000
Long-term Debt		$ 663,000,000				662,000,000
CGP | Variable Interest Entity, Primary Beneficiary [Member] | Secured Debt [Member] | Horseshoe Baltimore Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Final Maturity Date	[7]	2020
Debt Instrument, Interest Rate, Stated Percentage	[6],[7]	8.30%
Long-term Debt, Gross	[7]	$ 296,000,000
Long-term Debt	[7]	$ 287,000,000				287,000,000
Debt Instrument, Description of Variable Rate Basis		7.00% plus the greater of LIBOR or a 1.25% floor
CGP | Variable Interest Entity, Primary Beneficiary [Member] | Secured Debt [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Final Maturity Date	[8]	2019
Long-term Debt, Gross	[8]	$ 0
Long-term Debt	[8]	$ 0				0
CGP | Variable Interest Entity, Primary Beneficiary [Member] | Secured Debt [Member] | Horseshoe Baltimore FF&E Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Final Maturity Date	[9],[10]	2019
Debt Instrument, Interest Rate, Stated Percentage	[6],[9],[10]	8.75%
Long-term Debt, Gross	[9],[10]	$ 19,000,000
Long-term Debt	[9],[10]	$ 19,000,000				22,000,000
Debt Instrument, Description of Variable Rate Basis		7.50% plus the greater of LIBOR or a 1.25% floor. The rate is set at the 1.25% floor as of June 30, 2017
CGP | Variable Interest Entity, Primary Beneficiary [Member] | Secured Debt [Member] | Other Debt Obligations [Member]
Debt Instrument [Line Items]
Debt Instrument, Final Maturity Date		2018
Debt Instrument, Interest Rate, Stated Percentage	[6]	8.00%
Long-term Debt, Gross		$ 5,000,000
Long-term Debt		$ 4,000,000				4,000,000
CGP | Variable Interest Entity, Primary Beneficiary [Member] | Unsecured Debt [Member] | Special Improvement District Bonds [Member]
Debt Instrument [Line Items]
Debt Instrument, Final Maturity Date		2037
Debt Instrument, Interest Rate, Stated Percentage	[6]	5.30%
Long-term Debt, Gross		$ 13,000,000
Long-term Debt		$ 13,000,000				$ 14,000,000
London Interbank Offered Rate (LIBOR) [Member] | CERP | Line of Credit [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		6.00%
London Interbank Offered Rate (LIBOR) [Member] | CERP | Line of Credit [Member] | Amended Revolver | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		3.50%
London Interbank Offered Rate (LIBOR) [Member] | CERP | Secured Debt [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis		6.00% plus the greater of LIBOR or a 1% floor
London Interbank Offered Rate (LIBOR) [Member] | CGP | Variable Interest Entity, Primary Beneficiary [Member] | Line of Credit [Member] | Horseshoe Baltimore Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		7.00%
London Interbank Offered Rate (LIBOR) [Member] | CGP | Variable Interest Entity, Primary Beneficiary [Member] | Line of Credit [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		5.25%
London Interbank Offered Rate (LIBOR) [Member] | CGP | Variable Interest Entity, Primary Beneficiary [Member] | Line of Credit [Member] | Amended Revolver | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		3.00%
London Interbank Offered Rate (LIBOR) [Member] | CGP | Variable Interest Entity, Primary Beneficiary [Member] | Secured Debt [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis		5.25% plus the greater of LIBOR or a 1% floor
Amended First Lien Credit Agreement | London Interbank Offered Rate (LIBOR) [Member] | CERP | Secured Debt [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis		3.50% plus the greater of LIBOR or a 1% floor
Amended First Lien Credit Agreement | London Interbank Offered Rate (LIBOR) [Member] | CGP | Variable Interest Entity, Primary Beneficiary [Member] | Secured Debt [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis		3.00% plus the greater of LIBOR or a 1% floor

[1] Variable interest rate for the $211 million amended revolver is LIBOR plus 3.50%, down from 6.00% prior to the amendment. The variable interest rate on the remaining $59 million is determined by adding LIBOR to a base rate of 6.00%

[2] Variable interest rate was amended during the 2017 second quarter from 6.00% plus the greater of LIBOR or a 1% floor to 3.50% plus the greater of LIBOR or a 1% floor.

[3] Interest rate is fixed, except where noted.

[4] Variable interest rate calculated as LIBOR plus 7.00%

[5] Variable interest rate was amended during the 2017 second quarter from 5.25% plus the greater of LIBOR or a 1% floor to 3.00% plus the greater of LIBOR or a 1% floor

[6] Interest rate is fixed, except where noted.

[7] Variable interest rate calculated as 7.00% plus the greater of LIBOR or a 1.25% floor

[8] Variable interest rate calculated as LIBOR plus 3.00%, down from 5.25% prior to the amendment.

[9] This represents an equipment financing term loan facility.

[10] Variable interest rate calculated as 7.50% plus the greater of LIBOR or a 1.25% floor. The rate is set at the 1.25% floor as of June 30, 2017.