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Income Taxes - Additional information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Line Items]        
Equity in net losses of unconsolidated entities   $ 44,000,000 $ 38,000,000 $ 53,000,000
Interest expense   376,000,000 385,000,000 466,000,000
Other federal tax credits   14,000,000 15,000,000 13,000,000
Reduction in provision for income taxes due to tax audit settlements   (11,000,000) (10,000,000) (12,000,000)
Reduction in provision for income taxes due to state net operating losses and credits   10,000,000 17,000,000 16,000,000
Increase (decrease) to accruals and related deferred taxes   (10,000,000) (18,000,000) (24,000,000)
Increase (decrease) in provision for income taxes due to impairments   15,000,000 2,000,000 8,000,000
(Income) expense from divestitures   9,000,000 (7,000,000) (515,000,000)
Unremitted earnings in foreign subsidiaries   950,000,000    
Increase in valuation allowance   19,000,000    
Net unrecognized tax benefits that would impact effective tax rate in future period   69,000,000    
Accrued interest   2,000,000 2,000,000 1,000,000
Accrued interest in balance sheet   5,000,000 3,000,000  
Unrecognized tax benefits related to accrued liabilities or expense for penalties   0 0 0
Liabilities for unrecognized tax benefits including accrued interest that may be reversed within the next 12 months   7,000,000    
Deferred tax assets related to unrecognized tax benefits that may be reversed within the next 12 months   $ 3,000,000    
Wheelabrator [Member]        
Income Taxes [Line Items]        
(Income) expense from divestitures $ 7,000,000     (519,000,000)
2014 Audit [Member]        
Income Taxes [Line Items]        
Expected time of completion of IRS audits   9 months    
2015 Audit [Member]        
Income Taxes [Line Items]        
Expected time of completion of IRS audits   12 months    
2016 Audit [Member]        
Income Taxes [Line Items]        
Expected time of completion of IRS audits   18 months    
2017 Audit [Member]        
Income Taxes [Line Items]        
Expected time of completion of IRS audits   30 months    
Tax Implications [Member]        
Income Taxes [Line Items]        
Hypothetical tax expense (benefit) associated with gain on sale of business   $ (5,000,000)    
(Income) expense from divestitures   9,000,000    
Tax Implications [Member] | Wheelabrator [Member]        
Income Taxes [Line Items]        
Hypothetical tax expense (benefit) associated with gain on sale of business     4,000,000 138,000,000
(Income) expense from divestitures     (10,000,000) (515,000,000)
Federal [Member]        
Income Taxes [Line Items]        
Net operating loss carry-forwards   $ 25,000,000    
Operating loss carry-forwards, expiration date   Dec. 31, 2036    
Capital loss carry-forward   $ 453,000,000    
Capital loss carry-forward, expiration year one   2019    
Capital loss carry-forward, expiration year two   2021    
State [Member]        
Income Taxes [Line Items]        
Net operating loss carry-forwards   $ 2,000,000,000    
Operating loss carry-forwards, expiration date   Dec. 31, 2036    
State tax credit carry-forward   $ 24,000,000    
Investments Qualifying for Federal Tax Credits [Member]        
Income Taxes [Line Items]        
Equity in net losses of unconsolidated entities   31,000,000 30,000,000 32,000,000
Interest expense   3,000,000 4,000,000 5,000,000
Income tax benefit, including tax credits, from equity method investment   $ 55,000,000 $ 57,000,000 $ 58,000,000