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ACCUMULATED OTHER COMPREHENSIVE LOSS
 3 Months Ended
Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
ACCUMULATED OTHER COMPREHENSIVE LOSS ACCUMULATED OTHER COMPREHENSIVE LOSS
Components of accumulated other comprehensive loss
(in millions)Pension and Other Benefit LiabilitiesOtherTax EffectTotal
Balance at January 1, 2024
$(6,681)$40 $796 $(5,845)
Reclassifications into earnings(1)
66 — (14)52 
Balance at March 31, 2024
$(6,615)$40 $782 $(5,793)

Balance at January 1, 2023
$(6,624)$41 $782 $(5,801)
Reclassifications into earnings(1)
62 — (15)47 
Balance at March 31, 2023
$(6,562)$41 $767 $(5,754)
(1)Amounts reclassified from accumulated other comprehensive loss for pension and other benefit liabilities are recorded in miscellaneous, net in non-operating expense in our income statement.