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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2021
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table summarizes changes in Accumulated other comprehensive income (loss) for the three months ended March 31, 2021 and 2020:

Three Months Ended
March 31,
In millions20212020
Beginning balance$(1,642)$(1,705)
Foreign currency translation adjustments during the period33 (272)
Foreign currency translation adjustments reclassified to income
2 — 
Income taxes(42)(15)
Total foreign currency translation adjustments, net of tax(7)(287)
Pension and other postretirement benefit adjustments reclassified to income
13 12 
Income taxes(2)(3)
Total pension and other postretirement benefit adjustments, net of tax
11 9 
Ending balance$(1,638)$(1,983)