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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2020
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 WM 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, 2017 | ​ | $ | (33) | ​ | $ | 15 | ​ | $ | 29 | ​ | $ | (3) | ​ | $ | 8
Other comprehensive income (loss) before reclassifications, net of tax expense (benefit) of $0, $2, $0 and $1, respectively | ​ |  | — | ​ |  | 5 | ​ |  | (105) | ​ |  | 2 | ​ |  | (98)
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit of $3, $0, $0 and $0, respectively | ​ |  | 8 | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 8
Net current period other comprehensive income (loss) | ​ |  | 8 | ​ |  | 5 | ​ |  | (105) | ​ |  | 2 | ​ |  | (90)
Adoption of new accounting standard (a) | ​ | ​ | (7) | ​ | ​ | 3 | ​ | ​ | — | ​ | ​ | (1) | ​ | ​ | (5)
Balance, December 31, 2018 | ​ | $ | (32) | ​ | $ | 23 | ​ | $ | (76) | ​ | $ | (2) | ​ | $ | (87)
Other comprehensive income (loss) before reclassifications, net of tax expense (benefit) of $0, $5, $0 and $1, respectively | ​ |  | — | ​ |  | 15 | ​ |  | 55 | ​ |  | 2 | ​ |  | 72
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit of $3, $0, $0 and $0, respectively | ​ |  | 8 | ​ |  | — | ​ |  | — | ​ |  | (1) | ​ |  | 7
Net current period other comprehensive income (loss) | ​ |  | 8 | ​ |  | 15 | ​ |  | 55 | ​ |  | 1 | ​ |  | 79
Balance, December 31, 2019 | ​ | $ | (24) | ​ | $ | 38 | ​ | $ | (21) | ​ | $ | (1) | ​ | $ | (8)
Other comprehensive income (loss) before reclassifications, net of tax expense (benefit) of $2, $4, $0 and $1, respectively | ​ |  | 7 | ​ |  | 12 | ​ |  | 20 | ​ |  | 2 | ​ |  | 41
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit of $2, $0, $0 and $(1), respectively | ​ |  | 8 | ​ |  | (1) | ​ |  | — | ​ |  | (1) | ​ |  | 6
Net current period other comprehensive income (loss) | ​ |  | 15 | ​ |  | 11 | ​ |  | 20 | ​ |  | 1 | ​ |  | 47
Balance, December 31, 2020 | ​ | $ | (9) | ​ | $ | 49 | ​ | $ | (1) | ​ | $ | — | ​ | $ | 39
(a) | As of January 1, 2018, we adopted ASU 2018-02 and reclassified stranded tax effects to retained earnings.

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