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AOCL (Tables)
9 Months Ended
Sep. 30, 2021
Equity [Abstract]  
Schedule of Components of Other Comprehensive Income (Loss)
The changes in the balances for each component of accumulated other comprehensive loss ("AOCL") for the three and nine months ended September 30, 2021 and 2020 were as follows:

Accumulated Other Comprehensive LossThree Months EndedNine Months Ended
In millionsSep 30, 2021Sep 30, 2020Sep 30, 2021Sep 30, 2020
Cumulative Translation Adjustment
Beginning balance$(55)$(53)$(55)$(56)
Unrealized gains (losses) on foreign currency translation(1)
(Gains) losses reclassified from AOCL to net income 1
— — 
Other comprehensive income (loss), net of tax— 
Ending balance$(54)$(53)$(54)$(53)
Pension and Other Postretirement Benefits
Beginning balance$(1,611)$(1,570)$(1,715)$(1,609)
Gains (losses) arising during the period 2
— — 87 — 
Tax (expense) benefit— — (20)— 
Net gains (losses) arising during the period— — 67 — 
Amortization and recognition of net loss 3
27 26 76 77 
Tax expense (benefit) 4
(6)(6)(18)(18)
Net loss reclassified from AOCL to net income21 20 58 59 
Other comprehensive income (loss), net of tax21 20 125 59 
Ending balance$(1,590)$(1,550)$(1,590)$(1,550)
Total AOCL ending balance$(1,644)$(1,603)$(1,644)$(1,603)
1.Reclassified to "Sundry income (expense) - net."
2.See Note 9 for additional information.
3.These AOCL components are included in the computation of net periodic benefit cost (credit) of the Corporation's defined benefit pension and other postretirement benefit plans. See Note 9 for additional information.
4.Reclassified to "Provision for income taxes."