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Condensed Consolidating Financial Statements - Balance Sheets (Detail) - USD ($) $ in Millions | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Current assets: |  |  |  |  |  |
Cash and cash equivalents | $ 2,915 |  | $ 61 | $ 83 |  |
Other current assets | 2,645 |  | 2,584 |  |  |
Total current assets | 5,560 |  | 2,645 |  |  |
Property and equipment, net | 12,805 |  | 11,942 |  |  |
Other assets | 8,744 |  | 8,063 |  |  |
Total assets | 27,109 |  | 22,650 |  |  |
Current liabilities: |  |  |  |  |  |
Current portion of long-term debt | 211 |  | 432 |  |  |
Accounts payable and other current liabilities | 2,778 |  | 2,676 |  |  |
Total current liabilities | 2,989 |  | 3,108 |  |  |
Long-term debt, less current portion | 13,147 |  | 9,594 |  |  |
Other liabilities | 4,186 |  | 3,672 |  |  |
Total liabilities | 20,322 |  | 16,374 |  |  |
Equity: |  |  |  |  |  |
Stockholders' equity | 6,785 |  | 6,275 |  |  |
Noncontrolling interests | 2 |  | 1 |  |  |
Total equity | 6,787 | $ 6,467 | 6,276 | $ 6,241 | $ 6,056 | $ 6,042
Total liabilities and equity | 27,109 |  | 22,650 |  |  |
Eliminations [Member] |  |  |  |  |  |
Current assets: |  |  |  |  |  |
Other current assets | (46) |  |  |  |  |
Total current assets | (46) |  |  |  |  |
Investments in affiliates | (52,307) |  | (49,773) |  |  |
Advances to affiliates | (17,930) |  | (17,258) |  |  |
Total assets | (70,283) |  | (67,031) |  |  |
Current liabilities: |  |  |  |  |  |
Accounts payable and other current liabilities | (46) |  |  |  |  |
Total current liabilities | (46) |  |  |  |  |
Due to affiliates | (24,936) |  | (24,253) |  |  |
Total liabilities | (24,982) |  | (24,253) |  |  |
Equity: |  |  |  |  |  |
Stockholders' equity | (52,307) |  | (49,773) |  |  |
Advances to affiliates | 7,006 |  | 6,995 |  |  |
Total equity | (45,301) |  | (42,778) |  |  |
Total liabilities and equity | (70,283) |  | (67,031) |  |  |
WM [Member] | Reportable Legal Entities [Member] |  |  |  |  |  |
Current assets: |  |  |  |  |  |
Cash and cash equivalents | 2,863 |  |  |  |  |
Other current assets | 48 |  | 2 |  |  |
Total current assets | 2,911 |  | 2 |  |  |
Investments in affiliates | 25,940 |  | 24,676 |  |  |
Other assets | 5 |  | 8 |  |  |
Total assets | 28,856 |  | 24,686 |  |  |
Current liabilities: |  |  |  |  |  |
Current portion of long-term debt | 14 |  | 258 |  |  |
Accounts payable and other current liabilities | 113 |  | 82 |  |  |
Total current liabilities | 127 |  | 340 |  |  |
Long-term debt, less current portion | 10,611 |  | 7,377 |  |  |
Due to affiliates | 18,039 |  | 17,398 |  |  |
Other liabilities | 3 |  | 5 |  |  |
Total liabilities | 28,780 |  | 25,120 |  |  |
Equity: |  |  |  |  |  |
Stockholders' equity | 6,785 |  | 6,275 |  |  |
Advances to affiliates | (6,709) |  | (6,709) |  |  |
Total equity | 76 |  | (434) |  |  |
Total liabilities and equity | 28,856 |  | 24,686 |  |  |
WM Holdings [Member] | Reportable Legal Entities [Member] |  |  |  |  |  |
Current assets: |  |  |  |  |  |
Other current assets | 4 |  | 5 |  |  |
Total current assets | 4 |  | 5 |  |  |
Investments in affiliates | 26,367 |  | 25,097 |  |  |
Other assets | 10 |  | 31 |  |  |
Total assets | 26,381 |  | 25,133 |  |  |
Current liabilities: |  |  |  |  |  |
Accounts payable and other current liabilities | 7 |  | 9 |  |  |
Total current liabilities | 7 |  | 9 |  |  |
Long-term debt, less current portion | 248 |  | 304 |  |  |
Due to affiliates | 188 |  | 146 |  |  |
Total liabilities | 443 |  | 459 |  |  |
Equity: |  |  |  |  |  |
Stockholders' equity | 25,938 |  | 24,674 |  |  |
Total equity | 25,938 |  | 24,674 |  |  |
Total liabilities and equity | 26,381 |  | 25,133 |  |  |
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |  |  |
Current assets: |  |  |  |  |  |
Cash and cash equivalents | 52 |  | 61 |  |  |
Other current assets | 2,639 |  | 2,577 |  |  |
Total current assets | 2,691 |  | 2,638 |  |  |
Property and equipment, net | 12,805 |  | 11,942 |  |  |
Advances to affiliates | 17,930 |  | 17,258 |  |  |
Other assets | 8,729 |  | 8,024 |  |  |
Total assets | 42,155 |  | 39,862 |  |  |
Current liabilities: |  |  |  |  |  |
Current portion of long-term debt | 197 |  | 174 |  |  |
Accounts payable and other current liabilities | 2,704 |  | 2,585 |  |  |
Total current liabilities | 2,901 |  | 2,759 |  |  |
Long-term debt, less current portion | 2,288 |  | 1,913 |  |  |
Due to affiliates | 6,709 |  | 6,709 |  |  |
Other liabilities | 4,183 |  | 3,667 |  |  |
Total liabilities | 16,081 |  | 15,048 |  |  |
Equity: |  |  |  |  |  |
Stockholders' equity | 26,369 |  | 25,099 |  |  |
Advances to affiliates | (297) |  | (286) |  |  |
Noncontrolling interests | 2 |  | 1 |  |  |
Total equity | 26,074 |  | 24,814 |  |  |
Total liabilities and equity | $ 42,155 |  | $ 39,862 |  |  |

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