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AOCL
 9 Months Ended
Sep. 30, 2023
Equity [Abstract]  
ACCUMULATED OTHER COMPREHENSIVE LOSS ACCUMULATED OTHER COMPREHENSIVE LOSS
The changes in the balances for each component of accumulated other comprehensive loss ("AOCL") for the three and nine months ended September 30, 2023 and 2022 were as follows:

Accumulated Other Comprehensive LossThree Months EndedNine Months Ended
In millionsSep 30, 2023Sep 30, 2022Sep 30, 2023Sep 30, 2022
Cumulative Translation Adjustment
Beginning balance$(52)$(53)$(54)$(53)
Unrealized gains (losses) on foreign currency translation— — 2 — 
Ending balance$(52)$(53)$(52)$(53)
Pension and Other Postretirement Benefits
Beginning balance$(1,329)$(1,460)$(1,348)$(1,498)
Amortization of net loss and prior service credit reclassified from AOCL to net income 1
12 25 37 74 
Tax expense (benefit) 2
(3)(6)(9)(17)
Net loss and prior service credit reclassified from AOCL to net income9 19 28 57 
Ending balance$(1,320)$(1,441)$(1,320)$(1,441)
Total AOCL ending balance$(1,372)$(1,494)$(1,372)$(1,494)
1.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 10 for additional information.
2.Reclassified to "Provision for income taxes."