Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Other Finite and Infinite Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 499	$ 574
Finite-Lived Intangible Assets, Accumulated Amortization	241	295
Finite-Lived Intangible Assets, Net	258	279
Amortization of Intangible Assets	22	20	$ 20
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	(21)
Finite-Lived Intangible Assets, Amortization Expense, Year Two	(20)
Finite-Lived Intangible Assets, Amortization Expense, Year Three	(20)
Finite-Lived Intangible Assets, Amortization Expense, Year Four	(18)
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ (15)
Finite-Lived Intangible Asset, Weighted Average Period before Next Renewal or Extension	8 years
Waste Service And Energy Contracts Intangible Assets [Member]
Schedule of Other Finite and Infinite Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period	18 years
Finite-Lived Intangible Assets, Gross	$ 447	522
Finite-Lived Intangible Assets, Accumulated Amortization	211	271
Finite-Lived Intangible Assets, Net	$ 236	251
Waste And Service Contracts Intangible Liabilities [Member]
Schedule of Other Finite and Infinite Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period	14 years
Waste And Service Contracts Gross Noncurrent	$ 72	72
Waste And Service Contracts Accumulated Amortization Noncurrent	(66)	(64)
Waste Service And Energy Contracts Net Noncurrent	(6)	(8)
Amortization of Intangible Assets	(2)	(2)	$ (2)
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	(1)
Finite-Lived Intangible Assets, Amortization Expense, Year Two	0
Finite-Lived Intangible Assets, Amortization Expense, Year Three	0
Finite-Lived Intangible Assets, Amortization Expense, Year Four	0
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ 0
Other Intangible Assets [Member]
Schedule of Other Finite and Infinite Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period	5 years
Finite-Lived Intangible Assets, Gross	$ 52	52
Finite-Lived Intangible Assets, Accumulated Amortization	30	24
Finite-Lived Intangible Assets, Net	$ 22	$ 28