Organization and Summary of Significant Accounting Policies - Additional Information (Details) T in Millions, MW in Millions, $ in Millions		12 Months Ended
	Oct. 01, 2019 report	Dec. 31, 2020 USD ($) MW T Facility report landfill Segment station shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items]
Stock Repurchased During Period, Shares | shares		0	0	0
Right of use assets		$ 43	$ 46
Operating lease liability		49	52
Impairment of Long-Lived Assets to be Disposed of		0	2	$ 63
Cost of Goods and Services Sold		1,420	1,371	1,321
Impairment of Intangible Assets, Finite-lived		0	0	22
Intangible Assets, Net (Excluding Goodwill)		237	258
Cash and cash equivalents		55	37	58
Net Cash Provided by (Used in) Operating Activities		254	226	238
Defined Contribution Plan, Cost		$ 20	20	18
Organization (additional details) [Abstract]
Number of Operate and/or ownership positions in energy generation facilities | Facility		41
Annual processing capacity | T		21
Percent of municipal solid waste processed		8.00%
Annual generation capacity of megawatt hours | MW		10
Number of waste transfer stations | station		13
Number of materials processing facilities | Facility		20
Number of landfills | landfill		4
Number of metals processing facilities | Facility		1
Number of reportable segments | Segment		1
Restricted Funds Held in Trust [Abstract]
Restricted funds held in trust		$ 11	18	39
Restricted funds held in trust, noncurrent		6	8	8
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations			63	105	$ 194
Deferred Revenue [Abstract]
Deferred Revenue, Current		10	12
Property, Plant and Equipment [Abstract]
Land		20	20
Facilities And Equipment Gross		4,558	4,463
Landfill Gross		80	78
Construction in Progress, Gross		90	58
Property, Plant and Equipment, Gross		4,748	4,619
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment		(2,327)	(2,168)
Property, plant and equipment, net		2,421	2,451
Depreciation		204	201	199
Capital Expenditures Incurred but Not yet Paid		13	6	37
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning of period asset retirement obligation		26	29
Accretion expense		2	2
Liabilities settled		(3)	(3)
Revisions in estimated cash flows		2	0
Reclassification to assets held for sale		0	(2)
End of period asset retirement obligation		27	26	29
Less: current portion		(3)	(4)
Noncurrent asset retirement obligation		24	22
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive (loss) income		(32)	(35)	(33)
Other Comprehensive Income (Loss), Net of Tax		3	(3)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent		22	(7)	1
Net gain on sale of business and investments		26	49	217
(Loss) income before income tax benefit and equity in net income from unconsolidated investments		(50)	(3)	117
Accounting Changes [Abstract]
Retained Earnings (Accumulated Deficit)		(554)	(460)
Income Tax Expense (Benefit)		(18)	(7)	(29)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		(28)	10	152
Net Cash Provided by (Used in) Investing Activities		(176)	(145)	(139)
Net Cash Provided by (Used in) Financing Activities		(71)	(122)	(189)
Goodwill		$ 302	321	321
Number of Reporting Units | report	2	2
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive (loss) income				1
Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive (loss) income				(32)
North America [Member]
Organization (additional details) [Abstract]
Number of Operate and/or ownership positions in energy generation facilities | Facility		39
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive (loss) income		$ (8)	(30)	(23)
Other Comprehensive Income (Loss), Net of Tax		22	(7)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member] | Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive (loss) income				0
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive (loss) income				(23)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive (loss) income		3	3	2
Other Comprehensive Income (Loss), Net of Tax		0	0
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] | Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive (loss) income				1
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive (loss) income				3
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive (loss) income		(27)	(8)	(12)
Other Comprehensive Income (Loss), Net of Tax		$ (19)	4
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member] | Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive (loss) income				0
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive (loss) income				(12)
Minimum [Member] | Computer Equipment [Member]
Property, Plant and Equipment [Abstract]
Original useful lives for equipment		3 years
Maximum [Member] | Equipment [Member]
Property, Plant and Equipment [Abstract]
Original useful lives for equipment		50 years
Pass through costs [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Cost of Goods and Services Sold		$ 58	$ 57	$ 57
CES
Organization And Summary Of Significant Accounting Policies [Line Items]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount			5.00%
Accounting Changes [Abstract]
Goodwill			$ 46
Measurement Input, Discount Rate [Member]
Accounting Changes [Abstract]
Goodwill, Measurement Input		12.00%
Long Term Terminal Growth Rate [Member]
Accounting Changes [Abstract]
Goodwill, Measurement Input		2.50%
Other Funds [Member]
Restricted Funds Held in Trust [Abstract]
Restricted funds held in trust		$ 6	13
Restricted funds held in trust, noncurrent		6	8
Revenue Funds [Member]
Restricted Funds Held in Trust [Abstract]
Restricted funds held in trust		3	3
Restricted funds held in trust, noncurrent		0	0
Debt Service Funds [Member] | Principal Amount [Member]
Restricted Funds Held in Trust [Abstract]
Restricted funds held in trust		2	2
Restricted funds held in trust, noncurrent		$ 0	$ 0