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Changes in Accumulated Other Comprehensive Income (Loss) (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2021
Changes in Accumulated Other Comprehensive Income (Loss) |
Schedule of accumulated other comprehensive income (loss), net of taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Cumulative Gains (Losses)
​ | ​ | Cumulative Foreign | ​ | Net Actuarial (Losses) and | ​ | on Derivative Instruments
​ | ​ | Currency Translation | ​ | Prior Service (Costs) and | ​ | Designated as Cash Flow
​ | ​ | Adjustments | ​ | Credits | ​ | Hedges
(in millions) |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Balance at March 31 | ​ | $ | (5,395) | ​ | $ | (6,068) | ​ | $ | (3,786) | ​ | $ | (3,483) | ​ | $ | (104) | ​ | $ | 165
Other comprehensive income (loss) before reclassifications | ​ |  | 165 | ​ |  | 355 | ​ | ​ | (12) | ​ |  | (9) | ​ |  | (28) | ​ |  | (67)
Amounts reclassified from accumulated other comprehensive income | ​ |  | — | ​ |  | — | ​ |  | 60 | ​ |  | 46 | ​ |  | 34 | ​ |  | (19)
Net current period comprehensive income (loss) | ​ |  | 165 | ​ |  | 355 | ​ |  | 48 | ​ |  | 37 | ​ |  | 6 | ​ |  | (86)
Balance at June 30 | ​ | $ | (5,230) | ​ | $ | (5,713) | ​ | $ | (3,738) | ​ | $ | (3,446) | ​ | $ | (98) | ​ | $ | 79
​ Note 5 — Changes in Accumulated Other Comprehensive Income (Loss) (Continued) ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended June 30
​ | ​ | ​ | ​ | ​ | ​ | Cumulative Gains (Losses)
​ | ​ | Cumulative Foreign | ​ | Net Actuarial (Losses) and | ​ | on Derivative Instruments
​ | ​ | Currency Translation | ​ | Prior Service (Costs) and | ​ | Designated as Cash Flow
​ | ​ | Adjustments |  | Credits |  | Hedges
(in millions) |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Balance at January 1 | ​ | $ | (4,859) | ​ | $ | (4,924) | ​ | $ | (3,871) | ​ | $ | (3,540) | ​ | $ | (216) | ​ | $ | (1)
Other comprehensive income (loss) before reclassifications | ​ |  | (371) | ​ |  | (789) | ​ | ​ | 10 | ​ |  | (2) | ​ |  | 68 | ​ |  | 109
Amounts reclassified from accumulated other comprehensive income | ​ |  | — | ​ | ​ | — | ​ |  | 123 | ​ |  | 96 | ​ |  | 50 | ​ |  | (29)
Net current period comprehensive income (loss) | ​ |  | (371) | ​ |  | (789) | ​ |  | 133 | ​ |  | 94 | ​ |  | 118 | ​ |  | 80
Balance at June 30 | ​ | $ | (5,230) | ​ | $ | (5,713) | ​ | $ | (3,738) | ​ | $ | (3,446) | ​ | $ | (98) | ​ | $ | 79

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