Deferred Compensation and Employee Benefit Plans - Pension Plan Participation and Contribution Summary (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Multiemployer Plans [Line Items]
Contributions	$ 57	$ 55	$ 40
Southern Nevada Culinary and Bartenders Pension Plan
Multiemployer Plans [Line Items]
Contributions	$ 26	$ 25	19
Employer contributions	5.00%	5.00%
Legacy Plan of the National Retirement Fund
Multiemployer Plans [Line Items]
Contributions	$ 0	$ 0	9
Legacy Plan of the UNITE HERE Retirement Fund
Multiemployer Plans [Line Items]
Contributions	16	15	0
Central Pension Fund of the IUOE & Participating Employers
Multiemployer Plans [Line Items]
Contributions	6	6	5
Western Conference of Teamsters Pension Plan
Multiemployer Plans [Line Items]
Contributions	5	5	4
Local 68 Engineers Union Pension Plan
Multiemployer Plans [Line Items]
Contributions	1	1	1
NJ Carpenters Pension Fund
Multiemployer Plans [Line Items]
Contributions	0	0	0
Painters IUPAT
Multiemployer Plans [Line Items]
Contributions	1	1	1
Multiemployer Plan, Individually Insignificant Multiemployer Plans
Multiemployer Plans [Line Items]
Contributions	$ 2	$ 2	$ 1