Organization and Basis of Presentation (Details) T in Millions, MW in Millions, $ in Millions	3 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) MW T Facility	Dec. 31, 2020 USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items]
Solid waste processed (in tons) | T		21
Number Of Energy From Waste Facilities | Facility		41
Annual Output | MW		10
Goodwill		$ 303	$ 302
Right of use asset		40	43
Total operating lease liabilities		$ 47	$ 49
Goodwill, Impairment Loss	$ 16
Goodwill impairment tax benefit	$ 3