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Condensed Consolidating Financial Statements - Condensed Consolidating Balance Sheets (Parenthetical) (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]    
Long-term debt, less current portion $ 8,829 $ 8,676
Intercompany loans 5,900  
WM [Member]    
Condensed Financial Statements, Captions [Line Items]    
Long-term debt, less current portion 6,072 $ 5,801
WM [Member] | Immaterial Corrections from Non-Guarantor Subsidiaries to WM [Member] | Tax-exempt Bonds [Member]    
Condensed Financial Statements, Captions [Line Items]    
Long-term debt, less current portion $ 126