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Condensed Consolidating Financial Statements - Balance Sheets (Detail) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | ---
Current assets: |  |  |
Cash and cash equivalents | $ 83 | $ 22 | $ 35
Other current assets | 2,592 | 2,602 |
Total current assets | 2,675 | 2,624 |
Property and equipment, net | 11,815 | 11,559 |
Other assets | 8,101 | 7,646 |
Total assets | 22,591 | 21,829 |
Current liabilities: |  |  |
Current portion of long-term debt | 447 | 739 |
Accounts payable and other current liabilities | 2,623 | 2,523 |
Total current liabilities | 3,070 | 3,262 |
Long-term debt, less current portion | 9,569 | 8,752 |
Other liabilities | 3,711 | 3,773 |
Total liabilities | 16,350 | 15,787 |
Equity: |  |  |
Stockholders' equity | 6,239 | 6,019 |
Noncontrolling interests | 2 | 23 |
Total equity | 6,241 | 6,042 |
Total liabilities and equity | 22,591 | 21,829 |
Eliminations [Member] |  |  |
Current assets: |  |  |
Investments in affiliates | (48,599) | (45,286) |
Advances to affiliates | (16,289) | (15,349) |
Total assets | (64,888) | (60,635) |
Current liabilities: |  |  |
Due to affiliates | (22,645) | (21,701) |
Total liabilities | (22,645) | (21,701) |
Equity: |  |  |
Stockholders' equity | (48,599) | (45,286) |
Advances to affiliates | 6,356 | 6,352 |
Total equity | (42,243) | (38,934) |
Total liabilities and equity | (64,888) | (60,635) |
WM [Member] | Reportable Legal Entities [Member] |  |  |
Current assets: |  |  |
Other current assets | 46 | 5 |
Total current assets | 46 | 5 |
Investments in affiliates | 24,055 | 22,393 |
Other assets | 7 | 9 |
Total assets | 24,108 | 22,407 |
Current liabilities: |  |  |
Current portion of long-term debt | 104 | 537 |
Accounts payable and other current liabilities | 71 | 55 |
Total current liabilities | 175 | 592 |
Long-term debt, less current portion | 7,409 | 6,457 |
Due to affiliates | 16,353 | 15,404 |
Other liabilities | 5 | 8 |
Total liabilities | 23,942 | 22,461 |
Equity: |  |  |
Stockholders' equity | 6,239 | 6,019 |
Advances to affiliates | (6,073) | (6,073) |
Total equity | 166 | (54) |
Total liabilities and equity | 24,108 | 22,407 |
WM Holdings [Member] | Reportable Legal Entities [Member] |  |  |
Current assets: |  |  |
Other current assets | 5 | 5 |
Total current assets | 5 | 5 |
Investments in affiliates | 24,544 | 22,893 |
Other assets | 31 | 31 |
Total assets | 24,580 | 22,929 |
Current liabilities: |  |  |
Accounts payable and other current liabilities | 4 | 9 |
Total current liabilities | 4 | 9 |
Long-term debt, less current portion | 304 | 304 |
Due to affiliates | 219 | 224 |
Total liabilities | 527 | 537 |
Equity: |  |  |
Stockholders' equity | 24,053 | 22,392 |
Total equity | 24,053 | 22,392 |
Total liabilities and equity | 24,580 | 22,929 |
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |
Current assets: |  |  |
Cash and cash equivalents | 83 | 22 |
Other current assets | 2,541 | 2,592 |
Total current assets | 2,624 | 2,614 |
Property and equipment, net | 11,815 | 11,559 |
Advances to affiliates | 16,289 | 15,349 |
Other assets | 8,063 | 7,606 |
Total assets | 38,791 | 37,128 |
Current liabilities: |  |  |
Current portion of long-term debt | 343 | 202 |
Accounts payable and other current liabilities | 2,548 | 2,459 |
Total current liabilities | 2,891 | 2,661 |
Long-term debt, less current portion | 1,856 | 1,991 |
Due to affiliates | 6,073 | 6,073 |
Other liabilities | 3,706 | 3,765 |
Total liabilities | 14,526 | 14,490 |
Equity: |  |  |
Stockholders' equity | 24,546 | 22,894 |
Advances to affiliates | (283) | (279) |
Noncontrolling interests | 2 | 23 |
Total equity | 24,265 | 22,638 |
Total liabilities and equity | $ 38,791 | $ 37,128 |

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