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Condensed Consolidating Financial Statements - Condensed Consolidating Balance Sheets (Parenthetical) (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Condensed Financial Statements, Captions [Line Items] |  |
Long-term debt, less current portion | $ 8,893 | $ 8,676
Intercompany loans |  | 5,900
WM [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Long-term debt, less current portion | 6,229 | $ 5,801
Immaterial Corrections from Non-Guarantor Subsidiaries to WM [Member] | Tax-exempt Bonds [Member] | WM [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Long-term debt, less current portion | $ 126 |

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