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Condensed Consolidating Financial Statements - Condensed Consolidating Balance Sheets (Detail) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Current assets: |  |  |  |
Cash and cash equivalents | $ 35 | $ 32 | $ 30 | $ 39
Other current assets | 2,265 | 2,344 |  |
Total current assets | 2,300 | 2,376 |  |
Property and equipment, net | 11,136 | 10,950 |  |
Other assets | 7,513 | 7,533 |  |
Total assets | 20,949 | 20,859 |  |
Current liabilities: |  |  |  |
Current portion of long-term debt | 850 | 417 |  |
Accounts payable and other current liabilities | 2,409 | 2,377 |  |
Total current liabilities | 3,259 | 2,794 |  |
Long-term debt, less current portion | 8,495 | 8,893 |  |
Other liabilities | 3,895 | 3,852 |  |
Total liabilities | 15,649 | 15,539 |  |
Equity: |  |  |  |
Stockholders' equity | 5,278 | 5,297 |  |
Noncontrolling interests | 22 | 23 |  |
Total equity | 5,300 | 5,320 |  |
Total liabilities and equity | 20,949 | 20,859 |  |
Eliminations [Member] |  |  |  |
Current assets: |  |  |  |
Investments in affiliates | (42,712) | (40,255) |  |
Advances to affiliates | (14,171) | (13,000) |  |
Total assets | (56,883) | (53,255) |  |
Current liabilities: |  |  |  |
Due to affiliates | (19,955) | (18,777) |  |
Total liabilities | (19,955) | (18,777) |  |
Equity: |  |  |  |
Stockholders' equity | (42,712) | (40,255) |  |
Advances to affiliates | 5,784 | 5,777 |  |
Total equity | (36,928) | (34,478) |  |
Total liabilities and equity | (56,883) | (53,255) |  |
WM [Member] | Reportable Legal Entities [Member] |  |  |  |
Current assets: |  |  |  |
Other current assets | 3 | 5 |  |
Total current assets | 3 | 5 |  |
Investments in affiliates | 21,105 | 19,924 |  |
Other assets | 12 | 14 |  |
Total assets | 21,120 | 19,943 |  |
Current liabilities: |  |  |  |
Current portion of long-term debt | 736 | 269 |  |
Accounts payable and other current liabilities | 61 | 81 |  |
Total current liabilities | 797 | 350 |  |
Long-term debt, less current portion | 5,911 | 6,229 |  |
Due to affiliates | 14,425 | 13,350 |  |
Other liabilities | 8 | 16 |  |
Total liabilities | 21,141 | 19,945 |  |
Equity: |  |  |  |
Stockholders' equity | 5,278 | 5,297 |  |
Advances to affiliates | (5,299) | (5,299) |  |
Total equity | (21) | (2) |  |
Total liabilities and equity | 21,120 | 19,943 |  |
WM Holdings [Member] | Reportable Legal Entities [Member] |  |  |  |
Current assets: |  |  |  |
Other current assets | 5 | 5 |  |
Total current assets | 5 | 5 |  |
Investments in affiliates | 21,607 | 20,331 |  |
Other assets | 31 | 30 |  |
Total assets | 21,643 | 20,366 |  |
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 | 231 | 128 |  |
Total liabilities | 539 | 441 |  |
Equity: |  |  |  |
Stockholders' equity | 21,104 | 19,925 |  |
Total equity | 21,104 | 19,925 |  |
Total liabilities and equity | 21,643 | 20,366 |  |
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 35 | 32 | $ 30 | $ 39
Other current assets | 2,257 | 2,334 |  |
Total current assets | 2,292 | 2,366 |  |
Property and equipment, net | 11,136 | 10,950 |  |
Advances to affiliates | 14,171 | 13,000 |  |
Other assets | 7,470 | 7,489 |  |
Total assets | 35,069 | 33,805 |  |
Current liabilities: |  |  |  |
Current portion of long-term debt | 114 | 148 |  |
Accounts payable and other current liabilities | 2,344 | 2,287 |  |
Total current liabilities | 2,458 | 2,435 |  |
Long-term debt, less current portion | 2,280 | 2,360 |  |
Due to affiliates | 5,299 | 5,299 |  |
Other liabilities | 3,887 | 3,836 |  |
Total liabilities | 13,924 | 13,930 |  |
Equity: |  |  |  |
Stockholders' equity | 21,608 | 20,330 |  |
Advances to affiliates | (485) | (478) |  |
Noncontrolling interests | 22 | 23 |  |
Total equity | 21,145 | 19,875 |  |
Total liabilities and equity | $ 35,069 | $ 33,805 |  |

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