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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2025
Accumulated Other Comprehensive Income (Loss) |
Components of Accumulated Other Comprehensive Income (Loss), net of tax | The changes in the balances of each component of accumulated other comprehensive income (loss), net of tax, which is included as a component of Waste Management, Inc. stockholders’ equity, are as follows (in millions, with amounts in parentheses representing decreases to accumulated other comprehensive income): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Foreign | ​ | Post- | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Available- | ​ | Currency | ​ | Retirement | ​ | ​ | ​
​ | ​ | Derivative | ​ | for-Sale | ​ | Translation | ​ | Benefit | ​ | ​ | ​
​ |  | Instruments |  | Securities |  | Adjustments |  | Obligations |  | Total
Balance, December 31, 2024 | ​ | $ | 44 | ​ | $ | 15 | ​ | $ | (179) | ​ | $ | 5 | ​ | $ | (115)
Other comprehensive income (loss) before reclassifications, net of tax expense (benefit) of $0, $5, $0 and $0, respectively | ​ |  | (3) | ​ |  | 13 | ​ |  | 78 | ​ |  | — | ​ |  | 88
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit of $(1), $0, $0 and $0, respectively | ​ |  | (4) | ​ | ​ | — | ​ |  | — | ​ | ​ | — | ​ |  | (4)
Net current period other comprehensive income (loss) | ​ |  | (7) | ​ |  | 13 | ​ |  | 78 | ​ |  | — | ​ |  | 84
Balance, September 30, 2025 | ​ | $ | 37 | ​ | $ | 28 | ​ | $ | (101) | ​ | $ | 5 | ​ | $ | (31)
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