Organization and Basis of Presentation (Details) T in Millions, MW in Millions, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020 USD ($) MW T Facility	Sep. 30, 2020 USD ($) MW T Segment report Facility	Dec. 31, 2019 USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items]
Solid waste processed (in tons) | T	21	21
Number Of Energy From Waste Facilities | Facility	41	41
Annual Output | MW	10	10
Number of reportable segments | Segment		1
Number of reporting units | report		2
Goodwill	$ 302	$ 302	$ 321
Right of use asset	45	45	46
Total operating lease liabilities	50	$ 50	52
Goodwill, Impairment Loss	16
Goodwill impairment tax benefit	$ 3
CES
Organization And Summary Of Significant Accounting Policies [Line Items]
Goodwill			$ 46
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount			5.00%
Discount Rate
Organization And Summary Of Significant Accounting Policies [Line Items]
Goodwill, measurement input	12.00%	12.00%
Long Term Terminal Growth Rate
Organization And Summary Of Significant Accounting Policies [Line Items]
Goodwill, measurement input	2.50%	2.50%