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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2021
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, 2020 | ​ | $ | (9) | ​ | $ | 49 | ​ | $ | (1) | ​ | $ | — | ​ | $ | 39
Other comprehensive income (loss) before reclassifications, net of tax expense (benefit) of $0, $(2), $0 and $0, respectively | ​ |  | — | ​ |  | (5) | ​ |  | 13 | ​ |  | — | ​ |  | 8
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit of $0, $0, $0 and $0, respectively | ​ |  | 1 | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 1
Net current period other comprehensive income (loss) | ​ |  | 1 | ​ |  | (5) | ​ |  | 13 | ​ |  | — | ​ |  | 9
Balance, March 31, 2021 | ​ | $ | (8) | ​ | $ | 44 | ​ | $ | 12 | ​ | $ | — | ​ | $ | 48

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