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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 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 |  | Obligations |  | Total
Balance, 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 (a) | ​ |  | — | ​ |  | (9) | ​ |  | (76) | ​ |  | — | ​ |  | (85)
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit of $0, $0, $0 and $0, respectively | ​ |  | 2 | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 2
Net current period other comprehensive income (loss) | ​ |  | 2 | ​ |  | (9) | ​ |  | (76) | ​ |  | — | ​ |  | (83)
Balance, March 31, 2020 | ​ | $ | (22) | ​ | $ | 29 | ​ | $ | (97) | ​ | $ | (1) | ​ | $ | (91)
(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 0.7109 at March 31, 2020.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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