Amortization of Waste Service Energy Contract Intangible Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Waste Service Energy Contract Intangible Expense [Line Items]
Cost of Services, Amortization	$ 6	$ 6	$ 2
Finite-Lived Intangible Assets, Net	251
Waste And Service Contracts Noncurrent	$ (4)
Finite-Lived Intangible Asset, Weighted Average Period before Next Renewal or Extension	5 years
Waste Service And Energy Contracts Intangible Assets [Member]
Waste Service Energy Contract Intangible Expense [Line Items]
Cost of Services, Amortization	$ 14	21	25
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	13
Finite-Lived Intangible Assets, Amortization Expense, Year Two	13
Finite-Lived Intangible Assets, Amortization Expense, Year Three	13
Finite-Lived Intangible Assets, Amortization Expense, Year Four	13
Finite-Lived Intangible Assets, Amortization Expense, Year Five	13
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	186
Finite-Lived Intangible Assets, Net	251	263
Waste And Service Contracts Intangible Liabilities [Member]
Waste Service Energy Contract Intangible Expense [Line Items]
Cost Of Services Accretion	(2)	(6)	$ (6)
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	(2)
Future Accretion Expense Year Two	(2)
Future Accretion Expense Year Three	0
Future Accretion Expense Year Four	0
Future Accretion Expense Year Five	0
Future Accretion Expense After Year Five	0
Waste And Service Contracts Noncurrent	$ 4	$ 7