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Long-Term Debt - Summary of Long-term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2021	Sep. 24, 2021	Dec. 31, 2020	Sep. 18, 2020	Jul. 20, 2020	Jul. 06, 2020	Oct. 16, 2017
Long-term debt
Interest rate (as a percent)	4.30%
Total debt	$ 14,323
Current portion of long-term debt	(70)		$ (67)
Long-term debt	13,722		14,073
Estimate of Fair Value Measurement
Long-term debt
Special Improvement District Bonds	49
Long-term notes and other payables	2
Total debt	14,323
Current portion of long-term debt	(70)
Deferred finance charges associated with the CEI Revolving Credit Facility	0
Long-term debt	14,253
Fair value	14,713
Reported Value Measurement
Long-term debt
Special Improvement District Bonds	49		51
Long-term notes and other payables	2		2
Total debt	13,807		14,159
Current portion of long-term debt	(70)		(67)
Deferred finance charges associated with the CEI Revolving Credit Facility	(15)		(19)
Long-term debt	13,722		14,073
Unamortized premiums, discounts, and deferred finance charges	531		883
Baltimore Revolving Credit Facility \| Senior Notes \| Estimate of Fair Value Measurement
Long-term debt
Long-term debt, gross	0
Baltimore Revolving Credit Facility \| Senior Notes \| Reported Value Measurement
Long-term debt
Long-term debt, gross	0		0
CRC Revolving Credit Facility \| Senior Notes \| Estimate of Fair Value Measurement
Long-term debt
Long-term debt, gross	0
CRC Revolving Credit Facility \| Senior Notes \| Reported Value Measurement
Long-term debt
Long-term debt, gross	0		0
Baltimore Term Loan \| Senior Notes \| Estimate of Fair Value Measurement
Long-term debt
Long-term debt, gross	282
Baltimore Term Loan \| Senior Notes \| Reported Value Measurement
Long-term debt
Long-term debt, gross	275		0
CRC Term Loan \| Senior Notes \| Estimate of Fair Value Measurement
Long-term debt
Long-term debt, gross	4,512
CRC Term Loan \| Senior Notes \| Reported Value Measurement
Long-term debt
Long-term debt, gross	4,190		4,133
CEI Revolving Credit Facility \| Senior Notes \| Estimate of Fair Value Measurement
Long-term debt
Long-term line of credit	0
CEI Revolving Credit Facility \| Senior Notes \| Reported Value Measurement
Long-term debt
Long-term line of credit	0		0
CRC Incremental Term Loan \| Senior Notes \| Estimate of Fair Value Measurement
Long-term debt
Long-term debt, gross	1,778				$ 1,800
CRC Incremental Term Loan \| Senior Notes \| Reported Value Measurement
Long-term debt
Long-term debt, gross	$ 1,705		1,707
CRC Senior Secured Notes \| Senior Notes
Long-term debt
Interest rate (as a percent)	5.75%
CRC Senior Secured Notes \| Senior Notes \| Estimate of Fair Value Measurement
Long-term debt
Long-term debt, gross	$ 1,000					$ 1,000
CRC Senior Secured Notes \| Senior Notes \| Reported Value Measurement
Long-term debt
Long-term debt, gross	$ 985		981
CEI Senior Secured Notes \| Senior Notes
Long-term debt
Interest rate (as a percent)	6.25%
CEI Senior Secured Notes \| Senior Notes \| Estimate of Fair Value Measurement
Long-term debt
Long-term debt, gross	$ 3,400					3,400
CEI Senior Secured Notes \| Senior Notes \| Reported Value Measurement
Long-term debt
Long-term debt, gross	$ 3,346		3,333
Convention Center Mortgage Loan \| Senior Notes
Long-term debt
Interest rate (as a percent)	7.85%
Convention Center Mortgage Loan \| Senior Notes \| Estimate of Fair Value Measurement
Long-term debt
Long-term debt, gross				$ 400
Convention Center Mortgage Loan \| Senior Notes \| Reported Value Measurement
Long-term debt
Long-term debt, gross	$ 399		397
5% Convertible notes
Long-term debt
Interest rate (as a percent)	5.00%
5% Convertible notes \| Estimate of Fair Value Measurement
Long-term debt
Long-term debt, gross	$ 0
5% Convertible notes \| Reported Value Measurement
Long-term debt
Long-term debt, gross	$ 0		288
5% Convertible notes \| Senior Notes
Long-term debt
Interest rate (as a percent)	5.00%
CRC Notes
Long-term debt
Interest rate (as a percent)	5.25%
CRC Notes \| Estimate of Fair Value Measurement
Long-term debt
Long-term debt, gross	$ 0
CRC Notes \| Reported Value Measurement
Long-term debt
Long-term debt, gross	$ 0		1,499
CRC Notes \| Senior Notes
Long-term debt
Long-term debt, gross							$ 1,700
CEI Senior Secured Notes
Long-term debt
Interest rate (as a percent)	8.125%
CEI Senior Secured Notes \| Estimate of Fair Value Measurement
Long-term debt
Long-term debt, gross	$ 1,700
CEI Senior Secured Notes \| Reported Value Measurement
Long-term debt
Long-term debt, gross	$ 1,673		1,768
CEI Senior Secured Notes \| Senior Notes
Long-term debt
Long-term debt, gross						$ 1,800
Senior Notes
Long-term debt
Interest rate (as a percent)	4.625%
Senior Notes \| Estimate of Fair Value Measurement
Long-term debt
Long-term debt, gross	$ 1,200
Senior Notes \| Reported Value Measurement
Long-term debt
Long-term debt, gross	$ 1,183		$ 0
Senior Notes \| Senior Notes
Long-term debt
Long-term debt, gross		$ 1,200