Financial Information by Business Segments - Additional Information (Details) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) Segment	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Revenues		$ 495	$ 429	$ 424	$ 404	$ 457	$ 421	$ 418	$ 403	$ 1,752	$ 1,699	$ 1,645
Cost of Services, Depreciation and Amortization										215	207	198
Other Nonrecurring Expense										2	20	43
Assets		4,441				4,284				4,441	4,284	4,234
Payments to Acquire Productive Assets										277	359	376
Assets held for sale		653				0				653	0
Operating Income (Loss)		58	$ 46	$ 20	$ (23)	58	$ 60	$ 5	$ (14)	101	109	109
Equity in net income from unconsolidated investments										$ 1	4	13
Number of reportable segments | Segment										1
Segment Reporting, Additional Information about Entity's Reportable Segments										North America, which is comprised of waste and energy services operations located primarily in the United States and Canada.
United States [Member]
Segment Reporting Information [Line Items]
Revenues										$ 1,705	1,677	1,589
Assets		3,727				3,763				3,727	3,763	3,847
Other Countries [Member]
Segment Reporting Information [Line Items]
Revenues										47	22	56
Assets		61				521				61	521	290
Assets Held-for-sale [Member]
Segment Reporting Information [Line Items]
Assets held for sale		653				0				653	0	97
North America [Member]
Segment Reporting Information [Line Items]
Revenues										1,721	1,692	1,607
Cost of Services, Depreciation and Amortization										209	207	197
Other Nonrecurring Expense										2	20	43
Assets		3,753				3,794				3,753	3,794
Payments to Acquire Productive Assets										155	188
Operating Income (Loss)										95	116	108
Equity in net income from unconsolidated investments										1	1	0
All Other [Member]
Segment Reporting Information [Line Items]
Revenues	[1]									31	7	38
Cost of Services, Depreciation and Amortization	[1]									6	0	1
Other Nonrecurring Expense	[1]									0	0	0
Assets	[1]	$ 688				$ 490				688	490
Payments to Acquire Productive Assets	[1]									122	171
Operating Income (Loss)	[1]									6	(7)	1
Equity in net income from unconsolidated investments	[1]									$ 0	$ 3	$ 13

[1] (1)All other includes the financial results of our international assets.