Organization and Basis of Presentation (Details) T in Millions, MW in Millions, $ in Millions	Sep. 30, 2019 USD ($) MW T Facility	Jan. 01, 2019 USD ($)
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
Right of use asset	$ 48
Lease liability	$ 53
Accounting Standards Update 2018-02 [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ 0
Accounting Standards Update 2016-02 [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Right of use asset		57
Lease liability		62
Retained Earnings, Unappropriated [Member] | Accounting Standards Update 2018-02 [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ (2)