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Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2021
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | The following table summarizes changes in Accumulated other comprehensive income (loss) for the three and six months ended June 30, 2021 and 2020:
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
In millions | 2021 |  | 2020 |  | 2021 |  | 2020
Beginning balance | $ | (1,638) |  |  | $ | (1,983) |  |  | $ | (1,642) |  |  | $ | (1,705) |
Foreign currency translation adjustments during the period | 24 |  |  | 47 |  |  | 57 |  |  | (225) |
Foreign currency translation adjustments reclassified to income | 2 |  |  | — |  |  | 4 |  |  | — |
Income taxes | 11 |  |  | 17 |  |  | (31) |  |  | 2 |
Total foreign currency translation adjustments, net of tax | 37 |  |  | 64 |  |  | 30 |  |  | (223) |
Pension and other postretirement benefit adjustments reclassified to income | 14 |  |  | 12 |  |  | 27 |  |  | 24 |
Income taxes | (3) |  |  | (2) |  |  | (5) |  |  | (5) |
Total pension and other postretirement benefit adjustments, net of tax | 11 |  |  | 10 |  |  | 22 |  |  | 19 |
Ending balance | $ | (1,590) |  |  | $ | (1,909) |  |  | $ | (1,590) |  |  | $ | (1,909) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: 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=124509347&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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