Benefit Plans - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Expense relating to employees participation	$ 0
Contributed to pension plan	2,000,000
Net periodic postretirement benefit cost	$ 1,000,000	$ 0
Minimum
Defined Benefit Plan Disclosure [Line Items]
Employees eligible vesting period of service	5 years