Leases - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) renewal_option lease	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 4		$ 0
Number of finance leases | lease	2
Present value of lease liabilities	$ 4
Unconditional payment obligations	$ 5		$ 8
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets		$ 5
Present value of lease liabilities		$ 5
Ten Year Agreement, Five Year Renewal Option
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease revenue related party agreements, term	10 years
Lease revenue related party agreements, renewal term	5 years
Number of renewal options | renewal_option	2
Ten Year Agreement, One Year Renewal Option
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease revenue related party agreements, renewal term	1 year
Number of renewal options | renewal_option	10