Litigation, Contractual Commitments, and Contingent Liabilities - Additional Information (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended			9 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Apr. 30, 2019	Dec. 31, 2018	Sep. 30, 2017
Other Commitments [Line Items]
Contractual obligation		$ 10,918		$ 10,918
Stock options exercisable years				2 years
Share-based payment arrangement, amount							$ 32
Accelerated compensation expense (less than for three months ended September 30, 2019)		1		$ 13
Bankruptcy claims, amount of claims filed				417
Accrued liabilities		50		50
Principal value of CEC convertible notes		50		50				$ 45
Total estimated self-insurance liability		175		175				$ 173
Convertible debt
Other Commitments [Line Items]
Restricted cash and cash equivalents		$ 48		$ 48
Shares of CEC common stock (in shares)		8		8
CEC Convertible Notes
Other Commitments [Line Items]
Principal value of CEC convertible notes		$ 32		$ 32
VICI and CEOC LLC
Other Commitments [Line Items]
Annual principal payment of debt		10		10
Deferred credits and other liabilities		144		144
Cash payments or interest expense		3	$ 3	8	$ 8
Pending litigation
Other Commitments [Line Items]
Accrued liabilities						$ 7
Sports partnership
Other Commitments [Line Items]
Contractual obligation		260		260
NV Energy Sales System Exit
Other Commitments [Line Items]
Total fees to be incurred									$ 48
Other accrued liabilities, current		31		$ 31
NV Energy Sales System Exit | Maximum
Other Commitments [Line Items]
NV energy period				6 years
NV Energy Sales System Exit | Minimum
Other Commitments [Line Items]
NV energy period				3 years
NV Energy Exit
Other Commitments [Line Items]
Total fees to be incurred									$ 31
NV energy period				6 years
Business exit costs fair value		$ 21		$ 21
Forecast | Subsequent Event
Other Commitments [Line Items]
Severance and stock compensation charges	$ 20