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Condensed Consolidating Financial Statements - Balance Sheets (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Current assets: |  |  |  |
Cash and cash equivalents | $ 3,561 | $ 61 | $ 22 |
Other current assets | 2,648 | 2,584 |  |
Total current assets | 6,209 | 2,645 |  |
Property and equipment, net | 12,893 | 11,942 | 11,559 |
Other assets | 8,641 | 8,063 |  |
Total assets | 27,743 | 22,650 | 21,829 |
Current liabilities: |  |  |  |
Current portion of long-term debt | 218 | 432 |  |
Accounts payable and other current liabilities | 2,926 | 2,676 |  |
Total current liabilities | 3,144 | 3,108 |  |
Long-term debt, less current portion | 13,280 | 9,594 |  |
Other liabilities | 4,249 | 3,672 |  |
Total liabilities | 20,673 | 16,374 |  |
Equity: |  |  |  |
Stockholders' equity | 7,068 | 6,275 |  |
Noncontrolling interests | 2 | 1 |  |
Total equity | 7,070 | 6,276 | $ 6,042 | $ 5,320
Total liabilities and equity | 27,743 | 22,650 |  |
Eliminations [Member] |  |  |  |
Current assets: |  |  |  |
Investments in affiliates | (52,894) | (49,515) |  |
Advances to affiliates | (19,047) | (17,129) |  |
Total assets | (71,941) | (66,644) |  |
Current liabilities: |  |  |  |
Due to affiliates | (26,690) | (24,124) |  |
Total liabilities | (26,690) | (24,124) |  |
Equity: |  |  |  |
Stockholders' equity | (52,894) | (49,515) |  |
Advances to affiliates | 7,643 | 6,995 |  |
Total equity | (45,251) | (42,520) |  |
Total liabilities and equity | (71,941) | (66,644) |  |
WM [Member] | Reportable Legal Entities [Member] |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 3,485 |  |  |
Other current assets | 2 | 2 |  |
Total current assets | 3,487 | 2 |  |
Investments in affiliates | 26,221 | 24,547 |  |
Other assets | 6 | 8 |  |
Total assets | 29,714 | 24,557 |  |
Current liabilities: |  |  |  |
Current portion of long-term debt | 15 | 258 |  |
Accounts payable and other current liabilities | 105 | 82 |  |
Total current liabilities | 120 | 340 |  |
Long-term debt, less current portion | 10,736 | 7,377 |  |
Due to affiliates | 19,131 | 17,269 |  |
Other liabilities | 4 | 5 |  |
Total liabilities | 29,991 | 24,991 |  |
Equity: |  |  |  |
Stockholders' equity | 7,068 | 6,275 |  |
Advances to affiliates | (7,345) | (6,709) |  |
Total equity | (277) | (434) |  |
Total liabilities and equity | 29,714 | 24,557 |  |
WM Holdings [Member] | Reportable Legal Entities [Member] |  |  |  |
Current assets: |  |  |  |
Other current assets | 4 | 5 |  |
Total current assets | 4 | 5 |  |
Investments in affiliates | 26,673 | 24,968 |  |
Other assets | 10 | 31 |  |
Total assets | 26,687 | 25,004 |  |
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 | 214 | 146 |  |
Total liabilities | 469 | 459 |  |
Equity: |  |  |  |
Stockholders' equity | 26,218 | 24,545 |  |
Total equity | 26,218 | 24,545 |  |
Total liabilities and equity | 26,687 | 25,004 |  |
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 76 | 61 |  |
Other current assets | 2,642 | 2,577 |  |
Total current assets | 2,718 | 2,638 |  |
Property and equipment, net | 12,893 | 11,942 |  |
Advances to affiliates | 19,047 | 17,129 |  |
Other assets | 8,625 | 8,024 |  |
Total assets | 43,283 | 39,733 |  |
Current liabilities: |  |  |  |
Current portion of long-term debt | 203 | 174 |  |
Accounts payable and other current liabilities | 2,814 | 2,585 |  |
Total current liabilities | 3,017 | 2,759 |  |
Long-term debt, less current portion | 2,296 | 1,913 |  |
Due to affiliates | 7,345 | 6,709 |  |
Other liabilities | 4,245 | 3,667 |  |
Total liabilities | 16,903 | 15,048 |  |
Equity: |  |  |  |
Stockholders' equity | 26,676 | 24,970 |  |
Advances to affiliates | (298) | (286) |  |
Noncontrolling interests | 2 | 1 |  |
Total equity | 26,380 | 24,685 |  |
Total liabilities and equity | $ 43,283 | $ 39,733 |  |

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