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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) |
Components of Accumulated Other Comprehensive Income (Loss), net of tax |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Foreign | ​ | Post- | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Available- | ​ | Currency | ​ | Retirement | ​ | ​ | ​
​ | ​ | Derivative | ​ | for-Sale | ​ | Translation | ​ | Benefit | ​ | ​ | ​
​ |  | Instruments |  | Securities |  | Adjustments(a) |  | Obligations |  | Total
December 31, 2019 | ​ | $ | (24) | ​ | $ | 38 | ​ | $ | (21) | ​ | $ | (1) | ​ | $ | (8)
Other comprehensive income (loss) before reclassifications, net of tax expense (benefit) of $1, $3, $0 and $0, respectively | ​ |  | 4 | ​ |  | 7 | ​ |  | (23) | ​ |  | — | ​ |  | (12)
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit of $2, $0, $0 and $0, respectively | ​ |  | 5 | ​ |  | — | ​ |  | — | ​ |  | (1) | ​ |  | 4
Net current period other comprehensive income (loss) | ​ |  | 9 | ​ |  | 7 | ​ |  | (23) | ​ |  | (1) | ​ |  | (8)
September 30, 2020 | ​ | $ | (15) | ​ | $ | 45 | ​ | $ | (44) | ​ | $ | (2) | ​ | $ | (16)
(a) | Foreign currency translation adjustments were impacted by a decrease in the Canadian/U.S. dollar exchange rate from 0.7698 at December 31, 2019 to 0.7507 at September 30, 2020.

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