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Changes in Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of changes in accumulated other comprehensive loss | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Translation | ​ | Post-Retirement | ​ | ​ | ​
​ | ​ | Adjustments, Net | ​ | Benefits and | ​ | ​ | ​
​ |  | of Tax |  | Other, Net of Tax |  | Total
​ | ​ | (in millions)
Balance, December 31, 2020 | ​ | $ | (31) | ​ | $ | (49) | ​ | $ | (80)
Other comprehensive income before reclassifications, net of tax | ​ |  | 1 | ​ |  | 1 | ​ |  | 2
Reclassifications from accumulated other comprehensive loss to earnings, net of tax | ​ |  | — | ​ |  | — | ​ |  | —
Other comprehensive income, net of tax | ​ |  | 1 | ​ |  | 1 | ​ |  | 2
Balance, June 30, 2021 | ​ | $ | (30) | ​ | $ | (48) | ​ | $ | (78)

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