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Condensed Consolidating Financial Statements - Balance Sheets (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Current assets: |  |  |  |
Cash and cash equivalents | $ 22 | $ 32 | $ 39 | $ 1,307
Other current assets | 2,602 | 2,344 |  |
Total current assets | 2,624 | 2,376 |  |
Property and equipment, net | 11,559 | 10,950 | 10,665 |
Other assets | 7,646 | 7,533 |  |
Total assets | 21,829 | 20,859 | 20,367 |
Current liabilities: |  |  |  |
Current portion of long-term debt | 739 | 417 |  |
Accounts payable and other current liabilities | 2,523 | 2,377 |  |
Total current liabilities | 3,262 | 2,794 |  |
Long-term debt, less current portion | 8,752 | 8,893 |  |
Other liabilities | 3,773 | 3,852 |  |
Total liabilities | 15,787 | 15,539 |  |
Equity: |  |  |  |
Stockholders' equity | 6,019 | 5,297 |  |
Noncontrolling interests | 23 | 23 |  |
Total equity | 6,042 | 5,320 | 5,367 | 5,889
Total liabilities and equity | 21,829 | 20,859 |  |
Eliminations [Member] |  |  |  |
Current assets: |  |  |  |
Investments in affiliates | (45,286) | (40,255) |  |
Advances to affiliates | (15,349) | (13,000) |  |
Total assets | (60,635) | (53,255) |  |
Current liabilities: |  |  |  |
Due to affiliates | (21,701) | (18,777) |  |
Total liabilities | (21,701) | (18,777) |  |
Equity: |  |  |  |
Stockholders' equity | (45,286) | (40,255) |  |
Advances to affiliates | 6,352 | 5,777 |  |
Total equity | (38,934) | (34,478) |  |
Total liabilities and equity | (60,635) | (53,255) |  |
WM [Member] | Reportable Legal Entities [Member] |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents |  |  |  | 1,235
Other current assets | 5 | 5 |  |
Total current assets | 5 | 5 |  |
Investments in affiliates | 22,393 | 19,924 |  |
Other assets | 9 | 14 |  |
Total assets | 22,407 | 19,943 |  |
Current liabilities: |  |  |  |
Current portion of long-term debt | 537 | 269 |  |
Accounts payable and other current liabilities | 55 | 81 |  |
Total current liabilities | 592 | 350 |  |
Long-term debt, less current portion | 6,457 | 6,229 |  |
Due to affiliates | 15,404 | 13,350 |  |
Other liabilities | 8 | 16 |  |
Total liabilities | 22,461 | 19,945 |  |
Equity: |  |  |  |
Stockholders' equity | 6,019 | 5,297 |  |
Advances to affiliates | (6,073) | (5,299) |  |
Total equity | (54) | (2) |  |
Total liabilities and equity | 22,407 | 19,943 |  |
WM Holdings [Member] | Reportable Legal Entities [Member] |  |  |  |
Current assets: |  |  |  |
Other current assets | 5 | 5 |  |
Total current assets | 5 | 5 |  |
Investments in affiliates | 22,893 | 20,331 |  |
Other assets | 31 | 30 |  |
Total assets | 22,929 | 20,366 |  |
Current liabilities: |  |  |  |
Accounts payable and other current liabilities | 9 | 9 |  |
Total current liabilities | 9 | 9 |  |
Long-term debt, less current portion | 304 | 304 |  |
Due to affiliates | 224 | 128 |  |
Total liabilities | 537 | 441 |  |
Equity: |  |  |  |
Stockholders' equity | 22,392 | 19,925 |  |
Total equity | 22,392 | 19,925 |  |
Total liabilities and equity | 22,929 | 20,366 |  |
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 22 | 32 | $ 39 | $ 72
Other current assets | 2,592 | 2,334 |  |
Total current assets | 2,614 | 2,366 |  |
Property and equipment, net | 11,559 | 10,950 |  |
Advances to affiliates | 15,349 | 13,000 |  |
Other assets | 7,606 | 7,489 |  |
Total assets | 37,128 | 33,805 |  |
Current liabilities: |  |  |  |
Current portion of long-term debt | 202 | 148 |  |
Accounts payable and other current liabilities | 2,459 | 2,287 |  |
Total current liabilities | 2,661 | 2,435 |  |
Long-term debt, less current portion | 1,991 | 2,360 |  |
Due to affiliates | 6,073 | 5,299 |  |
Other liabilities | 3,765 | 3,836 |  |
Total liabilities | 14,490 | 13,930 |  |
Equity: |  |  |  |
Stockholders' equity | 22,894 | 20,330 |  |
Advances to affiliates | (279) | (478) |  |
Noncontrolling interests | 23 | 23 |  |
Total equity | 22,638 | 19,875 |  |
Total liabilities and equity | $ 37,128 | $ 33,805 |  |

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